Add JavaConfigurationTest.

PiperOrigin-RevId: 410102734

src/test/java/com/google/devtools/build/lib/view/java/JavaConfigurationTest.java

@@ -0,0 +1,70 @@
+// Copyright 2021 The Bazel Authors. All rights reserved.
+//
+// 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.google.devtools.build.lib.view.java;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.Iterables;
+import com.google.devtools.build.lib.analysis.config.BuildConfigurationCollection;
+import com.google.devtools.build.lib.analysis.config.BuildConfigurationValue;
+import com.google.devtools.build.lib.analysis.util.ConfigurationTestCase;
+import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.rules.cpp.CppConfiguration;
+import com.google.devtools.build.lib.rules.java.JavaConfiguration;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * Tests for the Java-specific parts of {@link BuildConfigurationValue} creation, and the
+ * Java-related configuration transitions.
+ */
+@RunWith(JUnit4.class)
+public class JavaConfigurationTest extends ConfigurationTestCase {
+
+  @Test
+  public void testJavaLauncherConfiguration() throws Exception {
+    // Default value of --java_launcher: null.
+    BuildConfigurationValue config = create();
+    JavaConfiguration cfg = config.getFragment(JavaConfiguration.class);
+    assertThat(cfg.getJavaLauncherLabel()).isNull();
+
+    // Explicitly enabled launcher as default
+    scratch.file("foo/BUILD", "filegroup(name='bar')", "filegroup(name='baz')");
+    config = create("--java_launcher=//foo:bar");
+    cfg = config.getFragment(JavaConfiguration.class);
+    assertThat(Label.parseAbsoluteUnchecked("//foo:bar")).isEqualTo(cfg.getJavaLauncherLabel());
+  }
+
+  @Test
+  public void testHostCrosstoolTop() throws Exception {
+    BuildConfigurationCollection configs = createCollection();
+    BuildConfigurationValue config = Iterables.getOnlyElement(configs.getTargetConfigurations());
+    assertThat(config.getFragment(CppConfiguration.class).getRuleProvidingCcToolchainProvider())
+        .isEqualTo(Label.parseAbsoluteUnchecked("//tools/cpp:toolchain"));
+
+    BuildConfigurationValue hostConfig = configs.getHostConfiguration();
+    assertThat(hostConfig.getFragment(CppConfiguration.class).getRuleProvidingCcToolchainProvider())
+        .isEqualTo(Label.parseAbsoluteUnchecked("//tools/cpp:toolchain"));
+  }
+
+
+  @Test
+  public void testConfigurationsHaveUniqueOutputDirectories() throws Exception {
+    assertConfigurationsHaveUniqueOutputDirectories(createCollection("--cpu=k8"));
+
+    assertConfigurationsHaveUniqueOutputDirectories(
+        createCollection("--cpu=k8", "--compilation_mode=opt"));
+  }
+}