Merge branch '3.1.x'

Closes gh-37202

buildSrc/src/main/java/org/springframework/boot/build/bom/UpgradePolicy.java

@@ -28,24 +28,19 @@ import org.springframework.boot.build.bom.bomr.version.DependencyVersion;
 public enum UpgradePolicy implements BiPredicate<DependencyVersion, DependencyVersion> {
 
 	/**
-	 * All versions more recent than the current version will be suggested as possible
+	 * Any version.
-	 * upgrades.
 	 */
-	ANY((candidate, current) -> current.compareTo(candidate) < 0),
+	ANY((candidate, current) -> true),
 
 	/**
-	 * New minor versions of the current major version will be suggested as possible
+	 * Minor versions of the current major version.
-	 * upgrades. For example, if the current version is 1.2.3, all 1.x.y versions after
-	 * 1.2.3 will be suggested. 2.x versions will not be offered.
 	 */
-	SAME_MAJOR_VERSION(DependencyVersion::isSameMajorAndNewerThan),
+	SAME_MAJOR_VERSION((candidate, current) -> candidate.isSameMajor(current)),
 
 	/**
-	 * New patch versions of the current minor version will be offered as possible
+	 * Patch versions of the current minor version.
-	 * upgrades. For example, if the current version is 1.2.3, all 1.2.x versions after
-	 * 1.2.3 will be suggested. 1.x versions will not be offered.
 	 */
-	SAME_MINOR_VERSION(DependencyVersion::isSameMinorAndNewerThan);
+	SAME_MINOR_VERSION((candidate, current) -> candidate.isSameMinor(current));
 
 	private final BiPredicate<DependencyVersion, DependencyVersion> delegate;
 

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/MoveToSnapshots.java

@@ -36,7 +36,7 @@ public abstract class MoveToSnapshots extends UpgradeDependencies {
 
 	@Inject
 	public MoveToSnapshots(BomExtension bom) {
-		super(bom);
+		super(bom, true);
 		getRepositoryUris().add(this.REPOSITORY_URI);
 	}
 

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/StandardLibraryUpdateResolver.java

@@ -48,9 +48,13 @@ class StandardLibraryUpdateResolver implements LibraryUpdateResolver {
 
 	private final UpgradePolicy upgradePolicy;
 
-	StandardLibraryUpdateResolver(VersionResolver versionResolver, UpgradePolicy upgradePolicy) {
+	private final boolean movingToSnapshots;
+
+	StandardLibraryUpdateResolver(VersionResolver versionResolver, UpgradePolicy upgradePolicy,
+			boolean movingToSnapshots) {
 		this.versionResolver = versionResolver;
 		this.upgradePolicy = upgradePolicy;
+		this.movingToSnapshots = movingToSnapshots;
 	}
 
 	@Override
@@ -147,6 +151,7 @@ class StandardLibraryUpdateResolver implements LibraryUpdateResolver {
 			DependencyVersion currentVersion) {
 		SortedSet<DependencyVersion> versions = this.versionResolver.resolveVersions(groupId, artifactId);
 		versions.removeIf((candidate) -> !this.upgradePolicy.test(candidate, currentVersion));
+		versions.removeIf((candidate) -> !currentVersion.isUpgrade(candidate, this.movingToSnapshots));
 		return versions;
 	}
 

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/UpgradeDependencies.java

@@ -61,9 +61,16 @@ public abstract class UpgradeDependencies extends DefaultTask {
 
 	private final BomExtension bom;
 
+	private final boolean movingToSnapshots;
+
 	@Inject
 	public UpgradeDependencies(BomExtension bom) {
+		this(bom, false);
+	}
+
+	protected UpgradeDependencies(BomExtension bom, boolean movingToSnapshots) {
 		this.bom = bom;
+		this.movingToSnapshots = movingToSnapshots;
 		getThreads().convention(2);
 	}
 
@@ -210,7 +217,7 @@ public abstract class UpgradeDependencies extends DefaultTask {
 		List<Upgrade> upgrades = new InteractiveUpgradeResolver(getServices().get(UserInputHandler.class),
 				new MultithreadedLibraryUpdateResolver(getThreads().get(),
 						new StandardLibraryUpdateResolver(new MavenMetadataVersionResolver(getRepositoryUris().get()),
-								this.bom.getUpgrade().getPolicy())))
+								this.bom.getUpgrade().getPolicy(), this.movingToSnapshots)))
 			.resolveUpgrades(matchingLibraries(), this.bom.getLibraries());
 		return upgrades;
 	}

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/AbstractDependencyVersion.java

@@ -38,6 +38,14 @@ abstract class AbstractDependencyVersion implements DependencyVersion {
 		return this.comparableVersion.compareTo(otherComparable);
 	}
 
+	@Override
+	public boolean isUpgrade(DependencyVersion candidate, boolean movingToSnapshots) {
+		ComparableVersion comparableCandidate = (candidate instanceof AbstractDependencyVersion)
+				? ((AbstractDependencyVersion) candidate).comparableVersion
+				: new ComparableVersion(candidate.toString());
+		return comparableCandidate.compareTo(this.comparableVersion) > 0;
+	}
+
 	@Override
 	public boolean equals(Object obj) {
 		if (this == obj) {

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/ArtifactVersionDependencyVersion.java

@@ -23,6 +23,8 @@ import org.apache.maven.artifact.versioning.ArtifactVersion;
 import org.apache.maven.artifact.versioning.ComparableVersion;
 import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 
+import org.springframework.util.StringUtils;
+
 /**
  * A {@link DependencyVersion} backed by an {@link ArtifactVersion}.
  *
@@ -33,47 +35,75 @@ class ArtifactVersionDependencyVersion extends AbstractDependencyVersion {
 	private final ArtifactVersion artifactVersion;
 
 	protected ArtifactVersionDependencyVersion(ArtifactVersion artifactVersion) {
-		super(new ComparableVersion(artifactVersion.toString()));
+		super(new ComparableVersion(toNormalizedString(artifactVersion)));
 		this.artifactVersion = artifactVersion;
 	}
 
+	private static String toNormalizedString(ArtifactVersion artifactVersion) {
+		String versionString = artifactVersion.toString();
+		if (versionString.endsWith(".RELEASE")) {
+			return versionString.substring(0, versionString.length() - 8);
+		}
+		if (versionString.endsWith(".BUILD-SNAPSHOT")) {
+			return versionString.substring(0, versionString.length() - 15) + "-SNAPSHOT";
+		}
+		return versionString;
+	}
+
 	protected ArtifactVersionDependencyVersion(ArtifactVersion artifactVersion, ComparableVersion comparableVersion) {
 		super(comparableVersion);
 		this.artifactVersion = artifactVersion;
 	}
 
 	@Override
-	public boolean isNewerThan(DependencyVersion other) {
+	public boolean isSameMajor(DependencyVersion other) {
 		if (other instanceof ReleaseTrainDependencyVersion) {
 			return false;
 		}
-		return compareTo(other) > 0;
+		return extractArtifactVersionDependencyVersion(other).map(this::isSameMajor).orElse(true);
+	}
+
+	private boolean isSameMajor(ArtifactVersionDependencyVersion other) {
+		return this.artifactVersion.getMajorVersion() == other.artifactVersion.getMajorVersion();
 	}
 
 	@Override
-	public boolean isSameMajorAndNewerThan(DependencyVersion other) {
+	public boolean isSameMinor(DependencyVersion other) {
 		if (other instanceof ReleaseTrainDependencyVersion) {
 			return false;
 		}
-		return extractArtifactVersionDependencyVersion(other).map(this::isSameMajorAndNewerThan).orElse(true);
+		return extractArtifactVersionDependencyVersion(other).map(this::isSameMinor).orElse(true);
 	}
 
-	private boolean isSameMajorAndNewerThan(ArtifactVersionDependencyVersion other) {
+	private boolean isSameMinor(ArtifactVersionDependencyVersion other) {
-		return this.artifactVersion.getMajorVersion() == other.artifactVersion.getMajorVersion() && isNewerThan(other);
+		return isSameMajor(other) && this.artifactVersion.getMinorVersion() == other.artifactVersion.getMinorVersion();
 	}
 
 	@Override
-	public boolean isSameMinorAndNewerThan(DependencyVersion other) {
+	public boolean isUpgrade(DependencyVersion candidate, boolean movingToSnapshots) {
-		if (other instanceof ReleaseTrainDependencyVersion) {
+		if (!(candidate instanceof ArtifactVersionDependencyVersion)) {
 			return false;
 		}
-		return extractArtifactVersionDependencyVersion(other).map(this::isSameMinorAndNewerThan).orElse(true);
+		ArtifactVersion other = ((ArtifactVersionDependencyVersion) candidate).artifactVersion;
-	}
+		if (this.artifactVersion.equals(other)) {
-
+			return false;
-	private boolean isSameMinorAndNewerThan(ArtifactVersionDependencyVersion other) {
+		}
-		return this.artifactVersion.getMajorVersion() == other.artifactVersion.getMajorVersion()
+		if (this.artifactVersion.getMajorVersion() == other.getMajorVersion()
-				&& this.artifactVersion.getMinorVersion() == other.artifactVersion.getMinorVersion()
+				&& this.artifactVersion.getMinorVersion() == other.getMinorVersion()
-				&& isNewerThan(other);
+				&& this.artifactVersion.getIncrementalVersion() == other.getIncrementalVersion()) {
+			if (!StringUtils.hasLength(this.artifactVersion.getQualifier())
+					|| "RELEASE".equals(this.artifactVersion.getQualifier())) {
+				return false;
+			}
+			if ("SNAPSHOT".equals(this.artifactVersion.getQualifier())
+					|| "BUILD".equals(this.artifactVersion.getQualifier())) {
+				return true;
+			}
+			else if ("SNAPSHOT".equals(other.getQualifier()) || "BUILD".equals(other.getQualifier())) {
+				return movingToSnapshots;
+			}
+		}
+		return super.isUpgrade(candidate, movingToSnapshots);
 	}
 
 	@Override

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/CalendarVersionDependencyVersion.java

@@ -41,14 +41,6 @@ class CalendarVersionDependencyVersion extends ArtifactVersionDependencyVersion
 		super(artifactVersion, comparableVersion);
 	}
 
-	@Override
-	public boolean isNewerThan(DependencyVersion other) {
-		if (other instanceof ReleaseTrainDependencyVersion) {
-			return true;
-		}
-		return super.isNewerThan(other);
-	}
-
 	static CalendarVersionDependencyVersion parse(String version) {
 		if (!CALENDAR_VERSION_PATTERN.matcher(version).matches()) {
 			return null;

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/DependencyVersion.java

@@ -28,29 +28,30 @@ import java.util.function.Function;
 public interface DependencyVersion extends Comparable<DependencyVersion> {
 
 	/**
-	 * Returns whether this version is newer than the given {@code other} version.
+	 * Returns whether this version has the same major and minor versions as the
-	 * @param other version to test
+	 * {@code other} version.
-	 * @return {@code true} if this version is newer, otherwise {@code false}
+	 * @param other the version to test
-	 */
+	 * @return {@code true} if this version has the same major and minor, otherwise
-	boolean isNewerThan(DependencyVersion other);
-
-	/**
-	 * Returns whether this version has the same major versions as the {@code other}
-	 * version while also being newer.
-	 * @param other version to test
-	 * @return {@code true} if this version has the same major and is newer, otherwise
 	 * {@code false}
 	 */
-	boolean isSameMajorAndNewerThan(DependencyVersion other);
+	boolean isSameMinor(DependencyVersion other);
 
 	/**
-	 * Returns whether this version has the same major and minor versions as the
+	 * Returns whether this version has the same major version as the {@code other}
-	 * {@code other} version while also being newer.
+	 * version.
-	 * @param other version to test
+	 * @param other the version to test
-	 * @return {@code true} if this version has the same major and minor and is newer,
+	 * @return {@code true} if this version has the same major, otherwise {@code false}
-	 * otherwise {@code false}
 	 */
-	boolean isSameMinorAndNewerThan(DependencyVersion other);
+	boolean isSameMajor(DependencyVersion other);
+
+	/**
+	 * Returns whether the given {@code candidate} is an upgrade of this version.
+	 * @param candidate the version the consider
+	 * @param movingToSnapshots whether the upgrade is to be considered as part of moving
+	 * to snaphots
+	 * @return {@code true} if the candidate is an upgrade, otherwise false
+	 */
+	boolean isUpgrade(DependencyVersion candidate, boolean movingToSnapshots);
 
 	static DependencyVersion parse(String version) {
 		List<Function<String, DependencyVersion>> parsers = Arrays.asList(CalendarVersionDependencyVersion::parse,

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/ReleaseTrainDependencyVersion.java

@@ -28,7 +28,8 @@ import org.springframework.util.StringUtils;
  */
 final class ReleaseTrainDependencyVersion implements DependencyVersion {
 
-	private static final Pattern VERSION_PATTERN = Pattern.compile("([A-Z][a-z]+)-([A-Z]+)([0-9]*)");
+	private static final Pattern VERSION_PATTERN = Pattern
+		.compile("([A-Z][a-z]+)-((BUILD-SNAPSHOT)|([A-Z-]+)([0-9]*))");
 
 	private final String releaseTrain;
 
@@ -62,30 +63,44 @@ final class ReleaseTrainDependencyVersion implements DependencyVersion {
 	}
 
 	@Override
-	public boolean isNewerThan(DependencyVersion other) {
+	public boolean isUpgrade(DependencyVersion candidate, boolean movingToSnapshots) {
-		if (other instanceof CalendarVersionDependencyVersion) {
+		if (!(candidate instanceof ReleaseTrainDependencyVersion)) {
-			return false;
-		}
-		if (!(other instanceof ReleaseTrainDependencyVersion otherReleaseTrain)) {
 			return true;
 		}
-		return otherReleaseTrain.compareTo(this) < 0;
+		ReleaseTrainDependencyVersion candidateReleaseTrain = (ReleaseTrainDependencyVersion) candidate;
+		int comparison = this.releaseTrain.compareTo(candidateReleaseTrain.releaseTrain);
+		if (comparison != 0) {
+			return comparison < 0;
+		}
+		if (movingToSnapshots && !"BUILD-SNAPSHOT".equals(this.type)
+				&& "BUILD-SNAPSHOT".equals(candidateReleaseTrain.type)) {
+			return true;
+		}
+		comparison = this.type.compareTo(candidateReleaseTrain.type);
+		if (comparison != 0) {
+			return comparison < 0;
+		}
+		return Integer.compare(this.version, candidateReleaseTrain.version) < 0;
 	}
 
 	@Override
-	public boolean isSameMajorAndNewerThan(DependencyVersion other) {
+	public boolean isSameMajor(DependencyVersion other) {
-		return isNewerThan(other);
+		return isSameReleaseTrain(other);
 	}
 
 	@Override
-	public boolean isSameMinorAndNewerThan(DependencyVersion other) {
+	public boolean isSameMinor(DependencyVersion other) {
+		return isSameReleaseTrain(other);
+	}
+
+	private boolean isSameReleaseTrain(DependencyVersion other) {
 		if (other instanceof CalendarVersionDependencyVersion) {
 			return false;
 		}
-		if (!(other instanceof ReleaseTrainDependencyVersion otherReleaseTrain)) {
+		if (other instanceof ReleaseTrainDependencyVersion otherReleaseTrain) {
-			return true;
+			return otherReleaseTrain.releaseTrain.equals(this.releaseTrain);
 		}
-		return otherReleaseTrain.releaseTrain.equals(this.releaseTrain) && isNewerThan(other);
+		return true;
 	}
 
 	@Override
@@ -121,8 +136,9 @@ final class ReleaseTrainDependencyVersion implements DependencyVersion {
 		if (!matcher.matches()) {
 			return null;
 		}
-		return new ReleaseTrainDependencyVersion(matcher.group(1), matcher.group(2),
+		return new ReleaseTrainDependencyVersion(matcher.group(1),
-				(StringUtils.hasLength(matcher.group(3))) ? Integer.parseInt(matcher.group(3)) : 0, input);
+				StringUtils.hasLength(matcher.group(3)) ? matcher.group(3) : matcher.group(4),
+				(StringUtils.hasLength(matcher.group(5))) ? Integer.parseInt(matcher.group(5)) : 0, input);
 	}
 
 }

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/UnstructuredDependencyVersion.java

@@ -34,18 +34,13 @@ final class UnstructuredDependencyVersion extends AbstractDependencyVersion impl
 	}
 
 	@Override
-	public boolean isNewerThan(DependencyVersion other) {
+	public boolean isSameMajor(DependencyVersion other) {
-		return compareTo(other) > 0;
+		return true;
 	}
 
 	@Override
-	public boolean isSameMajorAndNewerThan(DependencyVersion other) {
+	public boolean isSameMinor(DependencyVersion other) {
-		return compareTo(other) > 0;
+		return true;
-	}
-
-	@Override
-	public boolean isSameMinorAndNewerThan(DependencyVersion other) {
-		return compareTo(other) > 0;
 	}
 
 	@Override

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/ArtifactVersionDependencyVersionTests.java

@@ -38,83 +38,28 @@ class ArtifactVersionDependencyVersionTests {
 	}
 
 	@Test
-	void isNewerThanWhenInputIsOlderMajorShouldReturnTrue() {
+	void isSameMajorWhenSameMajorAndMinorShouldReturnTrue() {
-		assertThat(version("2.1.2").isNewerThan(version("1.9.0"))).isTrue();
+		assertThat(version("1.10.2").isSameMajor(version("1.10.0"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsOlderMinorShouldReturnTrue() {
+	void isSameMajorWhenSameMajorShouldReturnTrue() {
-		assertThat(version("2.1.2").isNewerThan(version("2.0.2"))).isTrue();
+		assertThat(version("1.10.2").isSameMajor(version("1.9.0"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsOlderPatchShouldReturnTrue() {
+	void isSameMajorWhenDifferentMajorShouldReturnFalse() {
-		assertThat(version("2.1.2").isNewerThan(version("2.1.1"))).isTrue();
+		assertThat(version("2.0.2").isSameMajor(version("1.9.0"))).isFalse();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsNewerMajorShouldReturnFalse() {
+	void isSameMinorWhenSameMinorShouldReturnTrue() {
-		assertThat(version("2.1.2").isNewerThan(version("3.2.1"))).isFalse();
+		assertThat(version("1.10.2").isSameMinor(version("1.10.1"))).isTrue();
 	}
 
 	@Test
-	void isSameMajorAndNewerThanWhenMinorIsOlderShouldReturnTrue() {
+	void isSameMinorWhenDifferentMinorShouldReturnFalse() {
-		assertThat(version("1.10.2").isSameMajorAndNewerThan(version("1.9.0"))).isTrue();
+		assertThat(version("1.10.2").isSameMinor(version("1.9.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMajorIsOlderShouldReturnFalse() {
-		assertThat(version("2.0.2").isSameMajorAndNewerThan(version("1.9.0"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenPatchIsNewerShouldReturnTrue() {
-		assertThat(version("2.1.2").isSameMajorAndNewerThan(version("2.1.1"))).isTrue();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMinorIsNewerShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMajorAndNewerThan(version("2.2.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMajorIsNewerShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMajorAndNewerThan(version("3.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenPatchIsOlderShouldReturnTrue() {
-		assertThat(version("1.10.2").isSameMinorAndNewerThan(version("1.10.1"))).isTrue();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMinorIsOlderShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMinorAndNewerThan(version("2.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenVersionsAreTheSameShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMinorAndNewerThan(version("2.1.2"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenSameSnapshotsShouldReturnFalse() {
-		assertThat(version("3.1.2-SNAPSHOT").isSameMinorAndNewerThan(version("3.1.2-SNAPSHOT"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenPatchIsNewerShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMinorAndNewerThan(version("2.1.3"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMinorIsNewerShouldReturnFalse() {
-		assertThat(version("2.1.2").isSameMinorAndNewerThan(version("2.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMajorIsNewerShouldReturnFalse() {
-		assertThat(version("3.1.2").isSameMinorAndNewerThan(version("2.0.1"))).isFalse();
 	}
 
 	private ArtifactVersionDependencyVersion version(String version) {

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/CalendarVersionDependencyVersionTests.java

@@ -38,93 +38,38 @@ class CalendarVersionDependencyVersionTests {
 	}
 
 	@Test
-	void isNewerThanWhenInputIsEarlierYearShouldReturnTrue() {
+	void isSameMajorWhenSameMajorAndMinorShouldReturnTrue() {
-		assertThat(version("2020.1.2").isNewerThan(version("2019.9.0"))).isTrue();
+		assertThat(version("2020.0.0").isSameMajor(version("2020.0.1"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsOlderMinorShouldReturnTrue() {
+	void isSameMajorWhenSameMajorShouldReturnTrue() {
-		assertThat(version("2020.1.2").isNewerThan(version("2020.0.2"))).isTrue();
+		assertThat(version("2020.0.0").isSameMajor(version("2020.1.0"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsOlderMicroShouldReturnTrue() {
+	void isSameMajorWhenDifferentMajorShouldReturnFalse() {
-		assertThat(version("2020.1.2").isNewerThan(version("2020.1.1"))).isTrue();
+		assertThat(version("2020.0.0").isSameMajor(version("2021.0.0"))).isFalse();
 	}
 
 	@Test
-	void isNewerThanWhenInputIsLaterYearShouldReturnFalse() {
+	void isSameMinorWhenSameMinorShouldReturnTrue() {
-		assertThat(version("2020.1.2").isNewerThan(version("2021.2.1"))).isFalse();
+		assertThat(version("2020.0.0").isSameMinor(version("2020.0.1"))).isTrue();
 	}
 
 	@Test
-	void isSameMajorAndNewerThanWhenMinorIsOlderShouldReturnTrue() {
+	void isSameMinorWhenDifferentMinorShouldReturnFalse() {
-		assertThat(version("2020.10.2").isSameMajorAndNewerThan(version("2020.9.0"))).isTrue();
+		assertThat(version("2020.0.0").isSameMinor(version("2020.1.0"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMajorIsOlderShouldReturnFalse() {
-		assertThat(version("2020.0.2").isSameMajorAndNewerThan(version("2019.9.0"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMicroIsNewerShouldReturnTrue() {
-		assertThat(version("2020.1.2").isSameMajorAndNewerThan(version("2020.1.1"))).isTrue();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMinorIsNewerShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMajorAndNewerThan(version("2020.2.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenMajorIsNewerShouldReturnFalse() {
-		assertThat(version("2019.1.2").isSameMajorAndNewerThan(version("2020.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMicroIsOlderShouldReturnTrue() {
-		assertThat(version("2020.10.2").isSameMinorAndNewerThan(version("2020.10.1"))).isTrue();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMinorIsOlderShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMinorAndNewerThan(version("2020.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenVersionsAreTheSameShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMinorAndNewerThan(version("2020.1.2"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMicroIsNewerShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMinorAndNewerThan(version("2020.1.3"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMinorIsNewerShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMinorAndNewerThan(version("2020.0.1"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenMajorIsNewerShouldReturnFalse() {
-		assertThat(version("2020.1.2").isSameMinorAndNewerThan(version("2019.0.1"))).isFalse();
-	}
-
-	@Test
-	void calendarVersionIsNewerThanReleaseTrainVersion() {
-		assertThat(version("2020.0.0").isNewerThan(releaseTrainVersion("Aluminium-RELEASE"))).isTrue();
 	}
 
 	@Test
 	void calendarVersionIsNotSameMajorAsReleaseTrainVersion() {
-		assertThat(version("2020.0.0").isSameMajorAndNewerThan(releaseTrainVersion("Aluminium-RELEASE"))).isFalse();
+		assertThat(version("2020.0.0").isSameMajor(releaseTrainVersion("Aluminium-RELEASE"))).isFalse();
 	}
 
 	@Test
 	void calendarVersionIsNotSameMinorAsReleaseTrainVersion() {
-		assertThat(version("2020.0.0").isSameMinorAndNewerThan(releaseTrainVersion("Aluminium-RELEASE"))).isFalse();
+		assertThat(version("2020.0.0").isSameMinor(releaseTrainVersion("Aluminium-RELEASE"))).isFalse();
 	}
 
 	private ReleaseTrainDependencyVersion releaseTrainVersion(String version) {

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionTests.java

@@ -68,9 +68,4 @@ class DependencyVersionTests {
 		assertThat(DependencyVersion.parse("2020.0.0-M1")).isInstanceOf(CalendarVersionDependencyVersion.class);
 	}
 
-	@Test
-	void calendarVersionShouldBeNewerThanAReleaseCalendarVersion() {
-
-	}
-
 }

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/DependencyVersionUpgradeTests.java

@@ -0,0 +1,304 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.build.bom.bomr.version;
+
+import java.lang.annotation.Annotation;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Repeatable;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.lang.reflect.Method;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+import org.junit.jupiter.params.provider.ArgumentsSource;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link DependencyVersion#isUpgrade} of {@link DependencyVersion}
+ * implementations.
+ *
+ * @author Andy Wilkinson
+ */
+public class DependencyVersionUpgradeTests {
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.3")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.3.RELEASE")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.0")
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-RELEASE")
+	void isUpgradeWhenSameVersionShouldReturnFalse(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-SNAPSHOT", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.BUILD-SNAPSHOT", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-SNAPSHOT", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-BUILD-SNAPSHOT", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenSameSnapshotVersionShouldReturnFalse(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-SNAPSHOT", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.BUILD-SNAPSHOT", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-SNAPSHOT", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-BUILD-SNAPSHOT", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenSameSnapshotVersionAndMovingToSnapshotsShouldReturnFalse(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.4")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.4.RELEASE")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.1")
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-SR1")
+	void isUpgradeWhenLaterPatchReleaseShouldReturnTrue(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.4-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.4.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.1-SNAPSHOT")
+	void isUpgradeWhenSnapshotOfLaterPatchReleaseShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.4-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.4.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.1-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenSnapshotOfLaterPatchReleaseAndMovingToSnapshotsShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenSnapshotOfSameVersionShouldReturnFalse(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-SNAPSHOT", candidate = "1.2.3-M2")
+	@ArtifactVersion(current = "1.2.3.BUILD-SNAPSHOT", candidate = "1.2.3.M2")
+	@CalendarVersion(current = "2023.0.0-SNAPSHOT", candidate = "2023.0.0-M2")
+	@ReleaseTrain(current = "Kay-BUILD-SNAPSHOT", candidate = "Kay-M2")
+	void isUpgradeWhenSnapshotToMilestoneShouldReturnTrue(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-SNAPSHOT", candidate = "1.2.3-RC1")
+	@ArtifactVersion(current = "1.2.3.BUILD-SNAPSHOT", candidate = "1.2.3.RC1")
+	@CalendarVersion(current = "2023.0.0-SNAPSHOT", candidate = "2023.0.0-RC1")
+	@ReleaseTrain(current = "Kay-BUILD-SNAPSHOT", candidate = "Kay-RC1")
+	void isUpgradeWhenSnapshotToReleaseCandidateShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-SNAPSHOT", candidate = "1.2.3")
+	@ArtifactVersion(current = "1.2.3.BUILD-SNAPSHOT", candidate = "1.2.3.RELEASE")
+	@CalendarVersion(current = "2023.0.0-SNAPSHOT", candidate = "2023.0.0")
+	@ReleaseTrain(current = "Kay-BUILD-SNAPSHOT", candidate = "Kay-RELEASE")
+	void isUpgradeWhenSnapshotToReleaseShouldReturnTrue(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-M1", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.M1", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-M1", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-M1", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenMilestoneToSnapshotShouldReturnFalse(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-RC1", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RC1", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-RC1", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-RC1", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenReleaseCandidateToSnapshotShouldReturnFalse(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenReleaseToSnapshotShouldReturnFalse(DependencyVersion current, DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, false)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-M1", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.M1", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-M1", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-M1", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenMilestoneToSnapshotAndMovingToSnapshotsShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3-RC1", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RC1", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0-RC1", candidate = "2023.0.0-SNAPSHOT")
+	@ReleaseTrain(current = "Kay-RC1", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenReleaseCandidateToSnapshotAndMovingToSnapshotsShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ArtifactVersion(current = "1.2.3", candidate = "1.2.3-SNAPSHOT")
+	@ArtifactVersion(current = "1.2.3.RELEASE", candidate = "1.2.3.BUILD-SNAPSHOT")
+	@CalendarVersion(current = "2023.0.0", candidate = "2023.0.0-SNAPSHOT")
+	void isUpgradeWhenReleaseToSnapshotAndMovingToSnapshotsShouldReturnFalse(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isFalse();
+	}
+
+	@ParameterizedTest
+	@ReleaseTrain(current = "Kay-RELEASE", candidate = "Kay-BUILD-SNAPSHOT")
+	void isUpgradeWhenReleaseTrainToSnapshotAndMovingToSnapshotsShouldReturnTrue(DependencyVersion current,
+			DependencyVersion candidate) {
+		assertThat(current.isUpgrade(candidate, true)).isTrue();
+	}
+
+	@Repeatable(ArtifactVersions.class)
+	@Target(ElementType.METHOD)
+	@Retention(RetentionPolicy.RUNTIME)
+	@ArgumentsSource(InputProvider.class)
+	@interface ArtifactVersion {
+
+		String current();
+
+		String candidate();
+
+	}
+
+	@Target(ElementType.METHOD)
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface ArtifactVersions {
+
+		ArtifactVersion[] value();
+
+	}
+
+	@Target(ElementType.METHOD)
+	@Retention(RetentionPolicy.RUNTIME)
+	@ArgumentsSource(InputProvider.class)
+	@interface ReleaseTrain {
+
+		String current();
+
+		String candidate();
+
+	}
+
+	@Target(ElementType.METHOD)
+	@Retention(RetentionPolicy.RUNTIME)
+	@ArgumentsSource(InputProvider.class)
+	@interface CalendarVersion {
+
+		String current();
+
+		String candidate();
+
+	}
+
+	static class InputProvider implements ArgumentsProvider {
+
+		@Override
+		public Stream<? extends Arguments> provideArguments(ExtensionContext context) throws Exception {
+			Method testMethod = context.getRequiredTestMethod();
+			Stream<Arguments> artifactVersions = artifactVersions(testMethod)
+				.map((artifactVersion) -> Arguments.of(VersionType.ARTIFACT_VERSION.parse(artifactVersion.current()),
+						VersionType.ARTIFACT_VERSION.parse(artifactVersion.candidate())));
+			Stream<Arguments> releaseTrains = releaseTrains(testMethod)
+				.map((releaseTrain) -> Arguments.of(VersionType.RELEASE_TRAIN.parse(releaseTrain.current()),
+						VersionType.RELEASE_TRAIN.parse(releaseTrain.candidate())));
+			Stream<Arguments> calendarVersions = calendarVersions(testMethod)
+				.map((calendarVersion) -> Arguments.of(VersionType.CALENDAR_VERSION.parse(calendarVersion.current()),
+						VersionType.CALENDAR_VERSION.parse(calendarVersion.candidate())));
+			return Stream.concat(Stream.concat(artifactVersions, releaseTrains), calendarVersions);
+		}
+
+		private Stream<ArtifactVersion> artifactVersions(Method testMethod) {
+			ArtifactVersions artifactVersions = testMethod.getAnnotation(ArtifactVersions.class);
+			if (artifactVersions != null) {
+				return Stream.of(artifactVersions.value());
+			}
+			return versions(testMethod, ArtifactVersion.class);
+		}
+
+		private Stream<ReleaseTrain> releaseTrains(Method testMethod) {
+			return versions(testMethod, ReleaseTrain.class);
+		}
+
+		private Stream<CalendarVersion> calendarVersions(Method testMethod) {
+			return versions(testMethod, CalendarVersion.class);
+		}
+
+		private <T extends Annotation> Stream<T> versions(Method testMethod, Class<T> type) {
+			T annotation = testMethod.getAnnotation(type);
+			return (annotation != null) ? Stream.of(annotation) : Stream.empty();
+		}
+
+	}
+
+	enum VersionType {
+
+		ARTIFACT_VERSION(ArtifactVersionDependencyVersion::parse),
+
+		CALENDAR_VERSION(CalendarVersionDependencyVersion::parse),
+
+		RELEASE_TRAIN(ReleaseTrainDependencyVersion::parse);
+
+		private final Function<String, DependencyVersion> parser;
+
+		VersionType(Function<String, DependencyVersion> parser) {
+			this.parser = parser;
+		}
+
+		DependencyVersion parse(String version) {
+			return this.parser.apply(version);
+		}
+
+	}
+
+}

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/MultipleComponentsDependencyVersionTests.java

@@ -29,43 +29,23 @@ import static org.assertj.core.api.Assertions.assertThat;
 class MultipleComponentsDependencyVersionTests {
 
 	@Test
-	void isNewerThanOnVersionWithNumericQualifierWhenInputHasNoQualifierShouldReturnTrue() {
+	void isSameMajorOfFiveComponentVersionWithSameMajorShouldReturnTrue() {
-		assertThat(version("2.9.9.20190806").isNewerThan(DependencyVersion.parse("2.9.9"))).isTrue();
+		assertThat(version("21.4.0.0.1").isSameMajor(version("21.1.0.0"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanOnVersionWithNumericQualifierWhenInputHasOlderQualifierShouldReturnTrue() {
+	void isSameMajorOfFiveComponentVersionWithDifferentMajorShouldReturnFalse() {
-		assertThat(version("2.9.9.20190806").isNewerThan(version("2.9.9.20190805"))).isTrue();
+		assertThat(version("21.4.0.0.1").isSameMajor(version("22.1.0.0"))).isFalse();
 	}
 
 	@Test
-	void isNewerThanOnVersionWithNumericQualifierWhenInputHasNewerQualifierShouldReturnFalse() {
+	void isSameMinorOfFiveComponentVersionWithSameMinorShouldReturnTrue() {
-		assertThat(version("2.9.9.20190806").isNewerThan(version("2.9.9.20190807"))).isFalse();
+		assertThat(version("21.4.0.0.1").isSameMinor(version("21.4.0.0"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanOnVersionWithNumericQualifierWhenInputHasSameQualifierShouldReturnFalse() {
+	void isSameMinorOfFiveComponentVersionWithDifferentMinorShouldReturnFalse() {
-		assertThat(version("2.9.9.20190806").isNewerThan(version("2.9.9.20190806"))).isFalse();
+		assertThat(version("21.4.0.0.1").isSameMinor(version("21.5.0.0"))).isFalse();
-	}
-
-	@Test
-	void isNewerThanWorksWith5Components() {
-		assertThat(version("21.4.0.0.1").isNewerThan(version("21.1.0.0"))).isTrue();
-	}
-
-	@Test
-	void isNewerThanWorksWith5ComponentsAndLastComponentIsConsidered() {
-		assertThat(version("21.1.0.0.1").isNewerThan(version("21.1.0.0"))).isTrue();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWorksWith5Components() {
-		assertThat(version("21.4.0.0.1").isSameMajorAndNewerThan(version("21.1.0.0"))).isTrue();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWorksWith5Components() {
-		assertThat(version("21.4.0.0.1").isSameMinorAndNewerThan(version("21.1.0.0"))).isFalse();
 	}
 
 	private MultipleComponentsDependencyVersion version(String version) {

buildSrc/src/test/java/org/springframework/boot/build/bom/bomr/version/ReleaseTrainDependencyVersionTests.java

@@ -38,81 +38,33 @@ class ReleaseTrainDependencyVersionTests {
 	}
 
 	@Test
-	void isNewerThanWhenReleaseTrainIsNewerShouldReturnTrue() {
+	void isSameMajorWhenReleaseTrainIsDifferentShouldReturnFalse() {
-		assertThat(version("Lovelace-RELEASE").isNewerThan(version("Kay-SR5"))).isTrue();
+		assertThat(version("Lovelace-RELEASE").isSameMajor(version("Kay-SR5"))).isFalse();
 	}
 
 	@Test
-	void isNewerThanWhenVersionIsNewerShouldReturnTrue() {
+	void isSameMajorWhenReleaseTrainIsTheSameShouldReturnTrue() {
-		assertThat(version("Kay-SR10").isNewerThan(version("Kay-SR5"))).isTrue();
+		assertThat(version("Lovelace-RELEASE").isSameMajor(version("Lovelace-SR5"))).isTrue();
 	}
 
 	@Test
-	void isNewerThanWhenVersionIsOlderShouldReturnFalse() {
+	void isSameMinorWhenReleaseTrainIsDifferentShouldReturnFalse() {
-		assertThat(version("Kay-RELEASE").isNewerThan(version("Kay-SR5"))).isFalse();
+		assertThat(version("Lovelace-RELEASE").isSameMajor(version("Kay-SR5"))).isFalse();
 	}
 
 	@Test
-	void isNewerThanWhenReleaseTrainIsOlderShouldReturnFalse() {
+	void isSameMinorWhenReleaseTrainIsTheSameShouldReturnTrue() {
-		assertThat(version("Ingalls-RELEASE").isNewerThan(version("Kay-SR5"))).isFalse();
+		assertThat(version("Lovelace-RELEASE").isSameMajor(version("Lovelace-SR5"))).isTrue();
-	}
-
-	@Test
-	void isSameMajorAndNewerWhenWhenReleaseTrainIsNewerShouldReturnTrue() {
-		assertThat(version("Lovelace-RELEASE").isSameMajorAndNewerThan(version("Kay-SR5"))).isTrue();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenReleaseTrainIsOlderShouldReturnFalse() {
-		assertThat(version("Ingalls-RELEASE").isSameMajorAndNewerThan(version("Kay-SR5"))).isFalse();
-	}
-
-	@Test
-	void isSameMajorAndNewerThanWhenVersionIsNewerShouldReturnTrue() {
-		assertThat(version("Kay-SR6").isSameMajorAndNewerThan(version("Kay-SR5"))).isTrue();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenReleaseTrainIsNewerShouldReturnFalse() {
-		assertThat(version("Lovelace-RELEASE").isSameMinorAndNewerThan(version("Kay-SR5"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenReleaseTrainIsTheSameAndVersionIsNewerShouldReturnTrue() {
-		assertThat(version("Kay-SR6").isSameMinorAndNewerThan(version("Kay-SR5"))).isTrue();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenReleaseTrainAndVersionAreTheSameShouldReturnFalse() {
-		assertThat(version("Kay-SR6").isSameMinorAndNewerThan(version("Kay-SR6"))).isFalse();
-	}
-
-	@Test
-	void isSameMinorAndNewerThanWhenReleaseTrainIsTheSameAndVersionIsOlderShouldReturnFalse() {
-		assertThat(version("Kay-SR6").isSameMinorAndNewerThan(version("Kay-SR7"))).isFalse();
-	}
-
-	@Test
-	void releaseTrainVersionIsNotNewerThanCalendarVersion() {
-		assertThat(version("Kay-SR6").isNewerThan(calendarVersion("2020.0.0"))).isFalse();
 	}
 
 	@Test
 	void releaseTrainVersionIsNotSameMajorAsCalendarTrainVersion() {
-		assertThat(version("Kay-SR6").isSameMajorAndNewerThan(calendarVersion("2020.0.0"))).isFalse();
+		assertThat(version("Kay-SR6").isSameMajor(calendarVersion("2020.0.0"))).isFalse();
 	}
 
 	@Test
 	void releaseTrainVersionIsNotSameMinorAsCalendarVersion() {
-		assertThat(version("Kay-SR6").isSameMinorAndNewerThan(calendarVersion("2020.0.0"))).isFalse();
+		assertThat(version("Kay-SR6").isSameMinor(calendarVersion("2020.0.0"))).isFalse();
-	}
-
-	@Test
-	void whenComparedWithADifferentDependencyVersionTypeThenTheResultsAreNonZero() {
-		DependencyVersion dysprosium = ReleaseTrainDependencyVersion.parse("Dysprosium-SR16");
-		DependencyVersion twentyTwenty = ArtifactVersionDependencyVersion.parse("2020.0.0");
-		assertThat(dysprosium).isLessThan(twentyTwenty);
-		assertThat(twentyTwenty).isGreaterThan(dysprosium);
 	}
 
 	private static ReleaseTrainDependencyVersion version(String input) {