Add test to reproduce #506.

Author: nedtwigg

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/MultiProjectAfterEvaluate.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016 DiffPlug
+ *
+ * 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
+ *
+ *     http://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 com.diffplug.gradle.spotless;
+
+import java.io.IOException;
+
+import org.assertj.core.api.Assertions;
+import org.gradle.testkit.runner.GradleRunner;
+import org.junit.Test;
+
+/** Reproduces https://github.com/diffplug/spotless/issues/506 */
+public class MultiProjectAfterEvaluate extends GradleIntegrationTest {
+	@Test
+	public void failureDoesntTriggerAll() throws IOException {
+		setFile("settings.gradle").toLines("include 'sub'");
+		setFile("build.gradle").toLines("buildscript { repositories { mavenCentral() }}");
+		setFile("sub/build.gradle")
+				.toLines(
+						"plugins {",
+						"  id 'com.diffplug.gradle.spotless'",
+						"  id 'java'",
+						"}",
+						"spotless { java { googleJavaFormat() } }");
+		String output = gradleRunner6().withArguments("spotlessApply", "--warning-mode", "all").build().getOutput().replace("\r\n", "\n");
+		Assertions.assertThat(output).contains("Using method Project#afterEvaluate(Action) when the project is already evaluated has been deprecated.");
+	}
+
+	private final GradleRunner gradleRunner6() throws IOException {
+		return gradleRunner().withGradleVersion("6.0");
+	}
+}