YARN-8141. Removed YARN_CONTAINER_RUNTIME_DOCKER_LOCAL_RESOURCE_MOUNTS flag.

            Contributed by Chandni Singh

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/test/java/org/apache/hadoop/yarn/service/containerlaunch/TestAbstractLauncher.java

@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.hadoop.yarn.service.containerlaunch;
+
+import org.apache.hadoop.yarn.service.ServiceContext;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link AbstractLauncher}.
+ */
+public class TestAbstractLauncher {
+
+  private AbstractLauncher launcher;
+
+  @Before
+  public void setup() {
+    launcher = new AbstractLauncher(mock(ServiceContext.class));
+  }
+
+  @Test
+  public void testDockerContainerMounts() throws IOException {
+    launcher.yarnDockerMode = true;
+    launcher.envVars.put(AbstractLauncher.ENV_DOCKER_CONTAINER_MOUNTS,
+        "s1:t1:ro");
+    launcher.mountPaths.put("s2", "t2");
+    launcher.completeContainerLaunch();
+    String dockerContainerMounts = launcher.containerLaunchContext
+        .getEnvironment().get(AbstractLauncher.ENV_DOCKER_CONTAINER_MOUNTS);
+
+    Assert.assertEquals("s1:t1:ro,s2:t2:ro", dockerContainerMounts);
+  }
+}