def snapshot = artifact.snapshot()

        and:
        moduleA.publishWithChangedContent()
        run("retrieve")

        then:
        artifact.assertContentsHaveChangedSince(snapshot)

        when:
        buildFile << """
class ChangingFalseRule implements ComponentMetadataRule {
    public void execute(ComponentMetadataContext context) {

    }

    URI toURI() {
        file.toURI()
    }

    Snapshot snapshot() {
        file.snapshot()
    }

    void assertHasChangedSince(Snapshot snapshot) {
        file.assertContentsHaveChangedSince(snapshot)
    }

    void assertExists() {
        file.assertIsFile()
    }

    void assertDoesNotExist() {
        file.assertDoesNotExist()
    }

        assertTrue(String.format("contents or modification time of %s have not changed", this), now.modTime != snapshot.modTime || !now.hash.equals(snapshot.hash));
    }

    public void assertContentsHaveChangedSince(Snapshot snapshot) {
        Snapshot now = snapshot();
        assertNotEquals(String.format("contents of %s have not changed", this), snapshot.hash, now.hash);
    }

        expectChangedModuleServed(snapshotModule)

        and:
        run 'resolveStaleThenFresh'

        then:
        file('fresh/unique-1.0-SNAPSHOT.jar').assertContentsHaveChangedSince(firstFreshVersion)
        file('fresh/unique-1.0-SNAPSHOT.jar').assertIsCopyOf(snapshotModule.artifactFile)
    }

    def "does not download snapshot artifacts after expiry when snapshot has not changed"() {