A unusual phenomena about MRUnit

[big data <bi...@outlook.com>]

Dear all,


I build the MRUnit 1.1 0 for hadoop2, and use it for a simple mapreduce program.

For the map function, it has format like this<LongWritable, Text, Text, Text>, so the input for map is <LongWritable, Text>, and the output should be <Text, Text>.


I write the unit test with MRUnit, and set the input and output like this:


@Test

public void test() throws IOException {


mapdriver.withInput(new LongWritable(), new Text("12014370926'"));


mapdriver.withOutput(new Text("324234233.1.1"),new Text("32323"));


mapdriver.runTest();


}


When I run the unit test, it runs failed, and an assertionError told me that Mismatch in key class: expected is Text, actual is LongWritable.


I don't know why it tell me the actual is LongWritable. In mapper, the context.write 's parameters are <Text, Text>!



The errorstack:

java.lang.AssertionError: 2 Error(s): (Missing expected output (324234233.1.1, 32323) at position 0, got (0, 12014370926')., Mismatch in key class: expected: class org.apache.hadoop.io.Text actual: class org.apache.hadoop.io.LongWritable)
at org.junit.Assert.fail(Assert.java:93)
at org.apache.hadoop.mrunit.internal.util.Errors.assertNone(Errors.java:73)
at org.apache.hadoop.mrunit.TestDriver.validate(TestDriver.java:768)
at org.apache.hadoop.mrunit.TestDriver.runTest(TestDriver.java:641)
at org.apache.hadoop.mrunit.TestDriver.runTest(TestDriver.java:627)
at mapreduce.testbmTest.test2(testbmTest.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)