Add `ratchetFrom` to maven by nedtwigg · Pull Request #603

Add `ratchetFrom` to maven by nedtwigg · Pull Request #603 · diffplug/spotless

	@Test
	public void singleProjectExhaustive() throws Exception {
	try (Git git = Git.init().setDirectory(rootFolder()).call()) {
	setFile("build.gradle").toLines(
	"plugins { id 'com.diffplug.gradle.spotless' }",
	"spotless {",
	" ratchetFrom 'baseline'",
	" format 'misc', {",
	" target 'src/markdown/*.md'",
	" custom 'lowercase', { str -> str.toLowerCase() }",
	" bumpThisNumberIfACustomStepChanges(1)",
	" }",
	"}");
	setFile(TEST_PATH).toContent("HELLO");
	git.add().addFilepattern(TEST_PATH).call();
	git.commit().setMessage("Initial state").call();
	// tag this initial state as the baseline for spotless to ratchet from
	git.tag().setName("baseline").call();

	// so at this point we have test.md, and it would normally be dirty,
	// but because it is unchanged, spotless says it is clean
	assertClean();

	// but if we change it so that it is not clean, spotless will now say it is dirty
	setFile(TEST_PATH).toContent("HELLO WORLD");
	assertDirty();
	gradleRunner().withArguments("spotlessApply").build();
	assertFile(TEST_PATH).hasContent("hello world");

	// but if we make it unchanged again, it goes back to being clean
	setFile(TEST_PATH).toContent("HELLO");
	assertClean();

	// and if we make the index dirty
	setFile(TEST_PATH).toContent("HELLO WORLD");
	git.add().addFilepattern(TEST_PATH).call();
	{
	// and the content dirty in the same way, then it's dirty
	assertDirty();
	// if we make the content something else dirty, then it's dirty
	setFile(TEST_PATH).toContent("HELLO MOM");
	assertDirty();
	// if we make the content unchanged, even though index it and index are dirty, then it's clean
	setFile(TEST_PATH).toContent("HELLO");
	assertClean();
	// if we delete the file, but it's still in the index, then it's clean
	setFile(TEST_PATH).deleted();
	assertClean();
	}
	// if we remove the file from the index
	git.rm().addFilepattern(TEST_PATH).setCached(true).call();
	{
	// and it's gone in real life too, then it's clean
	assertClean();
	// if the content is there and unchanged, then it's clean
	setFile(TEST_PATH).toContent("HELLO");
	assertClean();
	// if the content is dirty, then it's dirty
	setFile(TEST_PATH).toContent("HELLO WORLD");
	assertDirty();
	}

	// new files always get checked
	setFile("new.md").toContent("HELLO");
	{
	assertDirty();
	// even if they are added
	git.add().addFilepattern("new.md").call();
	assertDirty();
	}
	}
	}