[HUDI-694]Add unit test for SparkEnvCommand (#1401)

* Add test for SparkEnvCommand

hudi-cli/src/test/java/org/apache/hudi/cli/AbstractShellIntegrationTest.java

@@ -0,0 +1,46 @@
+/*
+ * 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.hudi.cli;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.springframework.shell.Bootstrap;
+import org.springframework.shell.core.JLineShellComponent;
+
+/**
+ * Class to start Bootstrap and JLineShellComponent.
+ */
+public abstract class AbstractShellIntegrationTest {
+  private static JLineShellComponent shell;
+
+  @BeforeClass
+  public static void startup() {
+    Bootstrap bootstrap = new Bootstrap();
+    shell = bootstrap.getJLineShellComponent();
+  }
+
+  @AfterClass
+  public static void shutdown() {
+    shell.stop();
+  }
+
+  protected static JLineShellComponent getShell() {
+    return shell;
+  }
+}

hudi-cli/src/test/java/org/apache/hudi/cli/commands/TestSparkEnvCommand.java

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+/*
+ * 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.hudi.cli.commands;
+
+import org.apache.hudi.cli.AbstractShellIntegrationTest;
+import org.apache.hudi.cli.HoodiePrintHelper;
+import org.junit.Test;
+import org.springframework.shell.core.CommandResult;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Test Cases for {@link SparkEnvCommand}.
+ */
+public class TestSparkEnvCommand extends AbstractShellIntegrationTest {
+
+  /**
+   * Test Cases for set and get spark env.
+   */
+  @Test
+  public void testSetAndGetSparkEnv() {
+    // First, be empty
+    CommandResult cr = getShell().executeCommand("show envs all");
+    String nullResult = HoodiePrintHelper.print(new String[] {"key", "value"}, new String[0][2]);
+    assertEquals(nullResult, cr.getResult().toString());
+
+    // Set SPARK_HOME
+    cr = getShell().executeCommand("set --conf SPARK_HOME=/usr/etc/spark");
+    assertTrue(cr.isSuccess());
+
+    //Get
+    cr = getShell().executeCommand("show env --key SPARK_HOME");
+    String result = HoodiePrintHelper.print(new String[] {"key", "value"}, new String[][]{new String[]{"SPARK_HOME", "/usr/etc/spark"}});
+    assertEquals(result, cr.getResult().toString());
+  }
+}