BIGTOP-4343: Add ut cases for stack classes in server module

bigtop-manager-server/src/main/java/org/apache/bigtop/manager/server/stack/dag/DAG.java

@@ -143,7 +143,7 @@ public boolean addEdge(Node fromNode, Node toNode, EdgeInfo edge, boolean create
      * @param node node
      * @return true if contains
      */
-    private boolean containsNode(Node node) {
+    protected boolean containsNode(Node node) {
         lock.readLock().lock();
 
         try {

bigtop-manager-server/src/test/java/org/apache/bigtop/manager/server/stack/dag/ComponentCommandWrapperTest.java

@@ -0,0 +1,107 @@
+/*
+ * 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
+ *
+ *    https://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.bigtop.manager.server.stack.dag;
+
+import org.apache.bigtop.manager.common.enums.Command;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class ComponentCommandWrapperTest {
+
+    @Test
+    public void testEqualsAndHashcode() {
+        ComponentCommandWrapper wrapper1 = new ComponentCommandWrapper("HDFS", Command.START);
+        ComponentCommandWrapper wrapper2 = new ComponentCommandWrapper("HDFS", Command.START);
+        ComponentCommandWrapper wrapper3 = new ComponentCommandWrapper("YARN", Command.START);
+        ComponentCommandWrapper wrapper4 = new ComponentCommandWrapper("HDFS", Command.STOP);
+
+        // Test equals method
+        assertEquals(wrapper1, wrapper2); // Same component name and command
+        assertNotEquals(wrapper1, wrapper3); // Different component name
+        assertNotEquals(wrapper1, wrapper4); // Same component name but different command
+
+        // Test hashCode method
+        assertEquals(wrapper1.hashCode(), wrapper2.hashCode()); // Same component name and command
+        assertNotEquals(wrapper1.hashCode(), wrapper3.hashCode()); // Different component name
+        assertNotEquals(wrapper1.hashCode(), wrapper4.hashCode()); // Same component name but different command
+    }
+
+    @Test
+    public void testComponentNameNull() {
+        ComponentCommandWrapper wrapper1 = new ComponentCommandWrapper(null, Command.START);
+        ComponentCommandWrapper wrapper2 = new ComponentCommandWrapper(null, Command.START);
+        ComponentCommandWrapper wrapper3 = new ComponentCommandWrapper(null, Command.STOP);
+
+        assertEquals(wrapper1, wrapper2); // Same command and both component names are null
+        assertNotEquals(wrapper1, wrapper3); // Same component name but different command
+
+        assertEquals(wrapper1.hashCode(), wrapper2.hashCode()); // Same command and both component names are null
+        assertNotEquals(wrapper1.hashCode(), wrapper3.hashCode()); // Same component name but different command
+    }
+
+    @Test
+    public void testCommandNull() {
+        ComponentCommandWrapper wrapper1 = new ComponentCommandWrapper("HDFS", null);
+        ComponentCommandWrapper wrapper2 = new ComponentCommandWrapper("HDFS", null);
+        ComponentCommandWrapper wrapper3 = new ComponentCommandWrapper("YARN", null);
+
+        assertEquals(wrapper1, wrapper2); // Same component name and both commands are null
+        assertNotEquals(wrapper1, wrapper3); // Different component name
+
+        assertEquals(wrapper1.hashCode(), wrapper2.hashCode()); // Same component name and both commands are null
+        assertNotEquals(wrapper1.hashCode(), wrapper3.hashCode()); // Different component name
+    }
+
+    @Test
+    public void testComponentNameAndCommandNull() {
+        ComponentCommandWrapper wrapper1 = new ComponentCommandWrapper(null, null);
+        ComponentCommandWrapper wrapper2 = new ComponentCommandWrapper(null, null);
+
+        assertEquals(wrapper1, wrapper2); // Both component name and command are null
+
+        assertEquals(wrapper1.hashCode(), wrapper2.hashCode()); // Both component name and command are null
+    }
+
+    @Test
+    public void testToString() {
+        ComponentCommandWrapper wrapper1 = new ComponentCommandWrapper("HDFS", Command.START);
+        ComponentCommandWrapper wrapper2 = new ComponentCommandWrapper("YARN", Command.STOP);
+
+        assertEquals("HDFS-START", wrapper1.toString()); // Normal component name and command
+        assertEquals("YARN-STOP", wrapper2.toString()); // Normal component name and command
+    }
+
+    @Test
+    public void testToStringWithComponentNameNull() {
+        ComponentCommandWrapper wrapper = new ComponentCommandWrapper(null, Command.START);
+
+        assertEquals("null-START", wrapper.toString()); // Component name is null
+    }
+
+    @Test
+    public void testToStringWithCommandNull() {
+        ComponentCommandWrapper wrapper = new ComponentCommandWrapper("HDFS", null);
+
+        assertThrows(NullPointerException.class, wrapper::toString);
+    }
+}

bigtop-manager-server/src/test/java/org/apache/bigtop/manager/server/stack/dag/DAGTest.java

@@ -0,0 +1,178 @@
+/*
+ * 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
+ *
+ *    https://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.bigtop.manager.server.stack.dag;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class DAGTest {
+
+    private DAG<String, String, String> dag;
+
+    @BeforeEach
+    void setUp() {
+        dag = new DAG<>();
+    }
+
+    // Test if node exists
+    @Test
+    void testContainsNode() {
+        assertFalse(dag.containsNode("A"));
+        dag.addNodeIfAbsent("A", "Node A");
+        assertTrue(dag.containsNode("A"));
+    }
+
+    // Test getting the number of nodes
+    @Test
+    void testGetNodesCount() {
+        assertEquals(0, dag.getNodesCount());
+        dag.addNodeIfAbsent("A", "Node A");
+        assertEquals(1, dag.getNodesCount());
+    }
+
+    // Test getting the number of edges
+    @Test
+    void testGetEdgesCount() {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        assertEquals(0, dag.getEdgesCount());
+        dag.addEdge("A", "B");
+        assertEquals(1, dag.getEdgesCount());
+    }
+
+    // Test adding nodes and edges normally
+    @Test
+    void testAddEdgeHappyPath() {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addNodeIfAbsent("C", "Node C");
+        assertTrue(dag.addEdge("A", "B"));
+        assertTrue(dag.addEdge("B", "C"));
+        assertTrue(dag.addEdge("A", "C"));
+        assertEquals(3, dag.getNodesCount());
+        assertEquals(3, dag.getEdgesCount());
+    }
+
+    // Test adding a self-loop edge
+    @Test
+    void testAddEdgeSelfLoop() {
+        dag.addNodeIfAbsent("A", "Node A");
+        assertFalse(dag.addEdge("A", "A"));
+    }
+
+    // Test adding an edge that would form a cycle
+    @Test
+    void testAddEdgeCycle() {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addNodeIfAbsent("C", "Node C");
+        assertTrue(dag.addEdge("A", "B"));
+        assertTrue(dag.addEdge("B", "C"));
+        assertFalse(dag.addEdge("C", "A"));
+    }
+
+    // Test if edge exists
+    @Test
+    void testContainsEdge() {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        assertFalse(dag.containsEdge("A", "B"));
+        dag.addEdge("A", "B");
+        assertTrue(dag.containsEdge("A", "B"));
+    }
+
+    // Test getting node information
+    @Test
+    void testGetNode() {
+        assertNull(dag.getNode("A"));
+        dag.addNodeIfAbsent("A", "Node A");
+        assertEquals("Node A", dag.getNode("A"));
+    }
+
+    // Test getting beginning nodes
+    @Test
+    void testGetBeginNode() {
+        assertTrue(dag.getBeginNode().isEmpty());
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addEdge("A", "B");
+        assertEquals(Collections.singletonList("A"), new LinkedList<>(dag.getBeginNode()));
+    }
+
+    // Test getting end nodes
+    @Test
+    void testGetEndNode() {
+        assertTrue(dag.getEndNode().isEmpty());
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addEdge("A", "B");
+        assertEquals(Collections.singletonList("B"), new LinkedList<>(dag.getEndNode()));
+    }
+
+    // Test getting previous nodes
+    @Test
+    void testGetPreviousNodes() {
+        assertTrue(dag.getPreviousNodes("A").isEmpty());
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addEdge("A", "B");
+        assertEquals(Collections.singletonList("A"), new LinkedList<>(dag.getPreviousNodes("B")));
+    }
+
+    // Test getting subsequent nodes
+    @Test
+    void testGetSubsequentNodes() {
+        assertTrue(dag.getSubsequentNodes("A").isEmpty());
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addEdge("A", "B");
+        assertEquals(Collections.singletonList("B"), new LinkedList<>(dag.getSubsequentNodes("A")));
+    }
+
+    // Test getting the indegree of a node
+    @Test
+    void testGetIndegree() {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        assertEquals(0, dag.getIndegree("A"));
+        dag.addEdge("A", "B");
+        assertEquals(1, dag.getIndegree("B"));
+    }
+
+    // Test topological sorting
+    @Test
+    void testTopologicalSort() throws Exception {
+        dag.addNodeIfAbsent("A", "Node A");
+        dag.addNodeIfAbsent("B", "Node B");
+        dag.addNodeIfAbsent("C", "Node C");
+        List<String> expected = List.of("A", "B", "C");
+        dag.addEdge("A", "B");
+        dag.addEdge("B", "C");
+        assertEquals(expected, dag.topologicalSort());
+    }
+}