add ProcessUtils UT

dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/utils/ProcessUtils.java

@@ -65,7 +65,7 @@ public class ProcessUtils {
      */
     public static String buildCommandStr(List<String> commandList) {
         String cmdstr;
-        String[] cmd = (String[]) commandList.toArray();
+        String[] cmd = commandList.toArray(new String[0]);
         SecurityManager security = System.getSecurityManager();
         boolean allowAmbiguousCommands = false;
         if (security == null) {
@@ -158,7 +158,7 @@ public class ProcessUtils {
         while (regexMatcher.find()) {
             matchList.add(regexMatcher.group());
         }
-        return (String[]) matchList.toArray();
+        return matchList.toArray(new String[0]);
     }
 
     /**
@@ -365,19 +365,24 @@ public class ProcessUtils {
      */
     public static String getPidsStr(int processId) throws Exception {
         StringBuilder sb = new StringBuilder();
-        Matcher mat;
+        Matcher mat = null;
         // pstree pid get sub pids
         if (OSUtils.isMacOS()) {
             String pids = OSUtils.exeCmd("pstree -sp " + processId);
-            mat = MACPATTERN.matcher(pids);
+            if (null != pids) {
+                mat = MACPATTERN.matcher(pids);
+            }
         } else {
             String pids = OSUtils.exeCmd("pstree -p " + processId);
             mat = WINDOWSATTERN.matcher(pids);
         }
 
-        while (mat.find()) {
-            sb.append(mat.group(1)).append(" ");
+        if (null != mat) {
+            while (mat.find()) {
+                sb.append(mat.group(1)).append(" ");
+            }
         }
+
         return sb.toString().trim();
     }
 

dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/utils/ProcessUtilsTest.java

@@ -14,34 +14,66 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.apache.dolphinscheduler.server.utils;
 
-import org.junit.Assert;
-import org.junit.Test;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import static org.powermock.api.mockito.PowerMockito.when;
+
+import org.apache.dolphinscheduler.common.utils.OSUtils;
 
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest({System.class, OSUtils.class})
 public class ProcessUtilsTest {
 
-    private static final Logger logger = LoggerFactory.getLogger(ProcessUtilsTest.class);
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+    }
 
     @Test
     public void getPidsStr() throws Exception {
-        String pidList = ProcessUtils.getPidsStr(1);
+        int processId = 1;
+        String pidList = ProcessUtils.getPidsStr(processId);
         Assert.assertNotEquals("The child process of process 1 should not be empty", pidList, "");
-        logger.info("Sub process list : {}", pidList);
+
+        PowerMockito.mockStatic(OSUtils.class);
+        when(OSUtils.isMacOS()).thenReturn(true);
+        when(OSUtils.exeCmd("pstree -sp " + processId)).thenReturn(null);
+        String pidListMac = ProcessUtils.getPidsStr(processId);
+        Assert.assertEquals(pidListMac, "");
     }
 
     @Test
     public void testBuildCommandStr() {
         List<String> commands = new ArrayList<>();
         commands.add("sudo");
-        Assert.assertEquals(ProcessUtils.buildCommandStr(commands), "sudo");
+        commands.add("-u");
+        commands.add("tenantCode");
+        //allowAmbiguousCommands false
+        Assert.assertEquals(ProcessUtils.buildCommandStr(commands), "sudo -u tenantCode");
 
+        //quota
+        commands.clear();
+        commands.add("\"sudo\"");
+        Assert.assertEquals(ProcessUtils.buildCommandStr(commands), "\"sudo\"");
+
+        //allowAmbiguousCommands true
+        commands.clear();
+        commands.add("sudo");
+        System.setProperty("jdk.lang.Process.allowAmbiguousCommands", "false");
+        Assert.assertEquals(ProcessUtils.buildCommandStr(commands), "\"sudo\"");
     }
 
 }