From 6876f847f34727478bd3750ed6a0d9b1f93dd3ce Mon Sep 17 00:00:00 2001
From: Lukas <lukas.nalezenec@gmail.com>
Date: Sat, 28 Dec 2013 12:53:31 +0100
Subject: [PATCH] #186 method context.getNumReduceTasks() does not work

---
 .../mapreduce/AbstractMockContextWrapper.java |  7 +++
 .../MockReduceContextWrapperTest.java         | 59 +++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 src/test/java/org/apache/hadoop/mrunit/internal/mapreduce/MockReduceContextWrapperTest.java

diff --git a/src/main/java/org/apache/hadoop/mrunit/internal/mapreduce/AbstractMockContextWrapper.java b/src/main/java/org/apache/hadoop/mrunit/internal/mapreduce/AbstractMockContextWrapper.java
index f0206a9..cde3fd8 100644
--- a/src/main/java/org/apache/hadoop/mrunit/internal/mapreduce/AbstractMockContextWrapper.java
+++ b/src/main/java/org/apache/hadoop/mrunit/internal/mapreduce/AbstractMockContextWrapper.java
@@ -131,6 +131,13 @@ public Path[] answer(InvocationOnMock invocation) throws Throwable {
           return DistributedCache.getLocalCacheFiles(configuration);
         }      
       });
+      when(context.getNumReduceTasks()).thenAnswer(new Answer<Integer>() {
+        @Override
+        @SuppressWarnings("deprecation")
+        public Integer answer(InvocationOnMock invocation) throws Throwable {
+          return configuration.getInt("mapred.reduce.tasks", 1);
+        }
+      });
     } catch (IOException e) {
       throw new RuntimeException(e);
     } catch (InterruptedException e) {
diff --git a/src/test/java/org/apache/hadoop/mrunit/internal/mapreduce/MockReduceContextWrapperTest.java b/src/test/java/org/apache/hadoop/mrunit/internal/mapreduce/MockReduceContextWrapperTest.java
new file mode 100644
index 0000000..03e1339
--- /dev/null
+++ b/src/test/java/org/apache/hadoop/mrunit/internal/mapreduce/MockReduceContextWrapperTest.java
@@ -0,0 +1,59 @@
+/**
+ * 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.hadoop.mrunit.internal.mapreduce;
+
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.Reducer;
+
+import org.apache.hadoop.mrunit.mapreduce.ReduceDriver;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class MockReduceContextWrapperTest {
+
+  class TestReducer extends Reducer {
+    @Override
+    protected void setup(Context context) throws IOException, InterruptedException {
+      super.setup(context);
+      assertEquals(10, context.getNumReduceTasks());
+    }
+  }
+
+
+  /**
+   * Tests that method context.getNumReduceTasks() correctly returns value from configuration
+   * */
+  @Test
+  public void testContext_getNumReduceTasks() throws Exception {
+    Reducer reducer = new TestReducer();
+    ReduceDriver driver = ReduceDriver.newReduceDriver(reducer);
+    driver.getConfiguration().setInt("mapred.reduce.tasks", 10);
+
+    List<Text> values = new ArrayList();
+    values.add(new Text("bb"));
+    driver.withInput(new Text("aa"), values);
+    assertEquals("Reducer not executed", 1, driver.run().size());
+
+  }
+}