YARN-8004. Add unit tests for inter queue preemption for dominant resource calculator. Contributed by Zian Chen.

(cherry picked from commit 71220d218db59cab0b03bbba427e5e9ef5b3003c)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/TestProportionalCapacityPreemptionPolicyInterQueueWithDRF.java

@@ -0,0 +1,68 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.server.resourcemanager.monitor.capacity;
+
+import org.junit.Test;
+
+import static org.mockito.Matchers.argThat;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+public class TestProportionalCapacityPreemptionPolicyInterQueueWithDRF
+    extends ProportionalCapacityPreemptionPolicyMockFramework {
+  @Test
+  public void testInterQueuePreemptionWithMultipleResource()
+      throws Exception {
+    /**
+     * Queue structure is:
+     *
+     * <pre>
+     *           root
+     *           /  \
+     *          a    b
+     * </pre>
+     *
+     */
+
+    String labelsConfig = "=100:200,true"; // default partition
+    String nodesConfig = "n1="; // only one node
+    String queuesConfig =
+        // guaranteed,max,used,pending
+        "root(=[100:200 100:200 100:200 100:200]);" + //root
+            "-a(=[50:100 100:200 40:80 30:70]);" + // a
+            "-b(=[50:100 100:200 60:120 40:50])";   // b
+
+    String appsConfig =
+        //queueName\t(priority,resource,host,expression,#repeat,reserved)
+        "a\t(1,2:4,n1,,20,false);" + // app1 in a
+            "b\t(1,2:4,n1,,30,false)"; // app2 in b
+
+    buildEnv(labelsConfig, nodesConfig, queuesConfig, appsConfig, true);
+    policy.editSchedule();
+
+    // Preemption should happen in Queue b, preempt <10,20> to Queue a
+    verify(mDisp, never()).handle(argThat(
+        new TestProportionalCapacityPreemptionPolicy.IsPreemptionRequestFor(
+            getAppAttemptId(1))));
+    verify(mDisp, times(5)).handle(argThat(
+        new TestProportionalCapacityPreemptionPolicy.IsPreemptionRequestFor(
+            getAppAttemptId(2))));
+  }
+}