WIP: Add test

src/test/java/com/google/devtools/build/lib/analysis/BUILD

@@ -400,6 +400,21 @@ java_test(
     ],
 )
 
+java_test(
+    name = "RunfilesLibraryUsersTest",
+    srcs = ["RunfilesLibraryUsersTest.java"],
+    deps = [
+        "//src/main/java/com/google/devtools/build/lib/actions",
+        "//src/main/java/com/google/devtools/build/lib/analysis:analysis_cluster",
+        "//src/main/java/com/google/devtools/build/lib/analysis:configured_target",
+        "//src/main/java/com/google/devtools/build/lib/cmdline",
+        "//src/main/java/com/google/devtools/build/lib/events",
+        "//src/test/java/com/google/devtools/build/lib/buildtool/util",
+        "//third_party:junit4",
+        "//third_party:truth",
+    ],
+)
+
 test_suite(
     name = "AllAnalysisTests",
     tests = [

src/test/java/com/google/devtools/build/lib/analysis/RunfilesLibraryUsersTest.java

@@ -0,0 +1,75 @@
+// Copyright 2020 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.analysis;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.devtools.build.lib.analysis.RunfilesProvider.RepositoryNameAndMapping;
+import com.google.devtools.build.lib.buildtool.util.BuildIntegrationTestCase;
+import com.google.devtools.build.lib.cmdline.RepositoryMapping;
+import com.google.devtools.build.lib.cmdline.RepositoryName;
+import java.util.Map;
+import java.util.stream.Collectors;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public final class RunfilesLibraryUsersTest extends BuildIntegrationTestCase {
+
+  @Before
+  public void setupWorkspace() throws Exception {
+    write("WORKSPACE", "workspace(name = 'my_workspace')");
+    write("common/rules.bzl",
+        "def fake_runfiles_library_impl(ctx):",
+        "  return [",
+        "    CcInfo(),",
+        "    JavaInfo(),",
+        "    PyInfo(),",
+        "    RunfilesLibraryInfo(),",
+        "  ]",
+        "fake_runfiles_library = rule(implementation = fake_runfiles_library_impl)"
+    );
+    write("common/BUILD.bazel",
+        "load(':rules.bzl', 'fake_runfiles_library')",
+        "fake_runfiles_library(name = 'runfiles_lib')"
+    );
+    write("pkg/java/BUILD.bazel",
+        "java_library(",
+        "  name = 'lib',",
+        "  srcs = ['Lib.java'],",
+        "  runtime_deps = ['//common:runfiles_lib'],",
+        ")"
+    );
+  }
+
+  @Test
+  public void testNoRunfilesLibraryUsers() throws Exception {
+    assertThat(getRunfilesLibraryUsers("//pkg/java:lib").keySet()).containsExactly(
+        RepositoryName.MAIN);
+  }
+
+  private Map<RepositoryName, RepositoryMapping> getRunfilesLibraryUsers(String label)
+      throws Exception {
+    ConfiguredTarget target = getConfiguredTarget(label);
+    RunfilesProvider runfilesProvider = target.getProvider(RunfilesProvider.class);
+
+    assertThat(runfilesProvider).isNotNull();
+    assertThat(runfilesProvider.getRunfilesLibraryUsers()).isNotNull();
+    return runfilesProvider.getRunfilesLibraryUsers().toList().stream().collect(
+        Collectors.toMap(RepositoryNameAndMapping::getRepositoryName,
+            RepositoryNameAndMapping::getRepositoryMapping));
+  }
+}