Add buildSrc including build conventions plugins

Closes gh-1942

buildSrc/src/test/java/io/spring/gradle/convention/IntegrationTestPluginITest.java

@@ -0,0 +1,52 @@
+package io.spring.gradle.convention;
+
+import io.spring.gradle.TestKit;
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.nio.file.Path;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class IntegrationTestPluginITest {
+	private io.spring.gradle.TestKit testKit;
+
+	@BeforeEach
+	void setup(@TempDir Path tempDir) {
+		this.testKit = new TestKit(tempDir.toFile());
+	}
+
+    @Test
+	public void checkWithJavaPlugin() throws Exception {
+        BuildResult result = this.testKit.withProjectResource("samples/integrationtest/withjava/")
+				.withArguments("check")
+				.build();
+		assertThat(result.task(":check").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(new File(testKit.getRootDir(), "build/test-results/integrationTest/")).exists();
+		assertThat(new File(testKit.getRootDir(), "build/reports/tests/integrationTest/")).exists();
+	}
+
+	@Test
+    public void checkWithPropdeps() throws Exception {
+        BuildResult result = this.testKit.withProjectResource("samples/integrationtest/withpropdeps/")
+				.withArguments("check")
+				.build();
+		assertThat(result.task(":check").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(new File(testKit.getRootDir(), "build/test-results/integrationTest/")).exists();
+		assertThat(new File(testKit.getRootDir(), "build/reports/tests/integrationTest/")).exists();
+	}
+
+	@Test
+    public void checkWithGroovy() throws Exception {
+		BuildResult result = this.testKit.withProjectResource("samples/integrationtest/withgroovy/")
+				.withArguments("check")
+				.build();
+		assertThat(result.task(":check").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(new File(testKit.getRootDir(), "build/test-results/integrationTest/")).exists();
+		assertThat(new File(testKit.getRootDir(), "build/reports/tests/integrationTest/")).exists();
+	}
+}