add test for pyspark

livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkInterpreter.java

@@ -47,7 +47,7 @@ public class LivyPySparkInterpreter extends Interpreter {
   }
 
   protected Map<String, Integer> userSessionMap;
-  private LivyHelper livyHelper;
+  protected LivyHelper livyHelper;
 
   public LivyPySparkInterpreter(Properties property) {
     super(property);

livy/src/main/test/org/apache/zeppelin/livy/LivyPySparkInterpreterTest.java

@@ -0,0 +1,87 @@
+/*
+ * 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.zeppelin.livy;
+
+
+import org.apache.zeppelin.interpreter.InterpreterContext;
+import org.apache.zeppelin.interpreter.InterpreterResult;
+import org.hamcrest.CoreMatchers;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ErrorCollector;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.runners.MockitoJUnitRunner;
+
+import java.util.HashMap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.doReturn;
+
+@RunWith(MockitoJUnitRunner.class)
+public class LivyPySparkInterpreterTest {
+
+  @Rule
+  public ErrorCollector collector = new ErrorCollector();
+
+
+  @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+  private static LivyPySparkInterpreter interpreter;
+
+  @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+  private InterpreterContext interpreterContext;
+
+  @AfterClass
+  public static void tearDown() {
+    interpreter.close();
+  }
+
+  @Before
+  public void prepareContext() throws Exception {
+    interpreter = Mockito.mock(LivyPySparkInterpreter.class);
+    interpreter.userSessionMap = new HashMap<>();
+    interpreter.userSessionMap.put(null, 0);
+    interpreter.livyHelper = Mockito.mock(LivyHelper.class);
+    interpreter.open();
+
+    doReturn(0).when(interpreter.livyHelper).createSession(interpreterContext, "");
+    doReturn(new InterpreterResult(InterpreterResult.Code.SUCCESS)).when(interpreter).interpret("print \"x is 1.\"", interpreterContext);
+  }
+
+  @Test
+  public void check_init_variables() throws Exception {
+    collector.checkThat("Check that, if userSessionMap is made: ",
+        interpreter.userSessionMap, CoreMatchers.notNullValue());
+  }
+
+  @Test
+  public void check_basic_pyspark() throws Exception {
+
+    String paragraphString = "print \"x is 1.\"";
+
+    final InterpreterResult actual = interpreter.interpret(paragraphString, interpreterContext);
+
+    collector.checkThat("Check that, result is computed: ",
+        actual.code(), CoreMatchers.equalTo(InterpreterResult.Code.SUCCESS));
+    assertThat(actual).isNotNull();
+  }
+
+}