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POHow can I return a multidimensional array as a collection of parameters for a JUnit test?
 

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  1. POHow can I return a multidimensional array as a collection of parameters for a JUnit test?
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    <p>I'm fairly new to Java, and I'm certainly in over my head. Okay, disclaimer aside, here's my story:</p> <p>I have a big list of video filenames and complementary strings called reference ID's in an XML file. The XML looks like this:</p> <pre><code>&lt;testdata&gt; &lt;testcase displayName="video1" refId="vid1xxyyzz" /&gt; &lt;testcase displayName="video2" refId="vid2aabbcc" /&gt; . . &lt;testcase displayName="video499" refId="vid499ffoooo" /&gt; &lt;/testdata&gt; </code></pre> <p>I've converted the XML schema into a class using XMLBeans and I'm able to import the data into a couple of arrays using the method documented here: <a href="http://docs.oracle.com/javase/tutorial/reflect/special/arraySetGet.html" rel="nofollow">http://docs.oracle.com/javase/tutorial/reflect/special/arraySetGet.html</a></p> <pre><code>// File import: File refIdFile = new File("C:\testdata.xml"); DisplayNameReferenceIdDoc = DisplayNameReferenceIdDocument.Factory.parse(refIdFile); displayNameReferenceId = DisplayNameReferenceIdDoc.getDisplayNameReferenceId(); tests = displayNameReferenceId.getTestcaseArray(); // Multi-dimensional array get/set: matrix = Array.newInstance(String.class, 2, tests.length); Object row0 = Array.get(matrix, 0); Object row1 = Array.get(matrix, 1); for (int i = 0; i &lt; tests.length; i++){ displayName = tests[i].getDisplayName(); refId = tests[i].getRefId(); Array.set(row0, i, displayName); Array.set(row1, i, refId); } </code></pre> <p>That's all happening in a <code>@Parameterized</code> method in my test class, which must return a collection. Here's the whole thing, zoomed out:</p> <pre><code>@RunWith(Parameterized.class) public class ValidateDisplayNameReferenceIdTest { static DisplayNameReferenceIdDocument DisplayNameReferenceIdDoc; static DisplayNameReferenceId displayNameReferenceId; static DisplayNameReferenceId.Test[] tests; static String displayName; static String refId; static Object matrix; @Parameterized.Parameters(name="{index}: {0}") public static Collection&lt;Object&gt; getTestParameters() throws IOException, XmlException { File refIdFile = new File("C:\testdata.xml"); DisplayNameReferenceIdDoc = DisplayNameReferenceIdDocument.Factory.parse(refIdFile); displayNameReferenceId = DisplayNameReferenceIdDoc.getDisplayNameReferenceId(); tests = displayNameReferenceId.getTestArray(); matrix = Array.newInstance(String.class, 2, tests.length); Object row0 = Array.get(matrix, 0); Object row1 = Array.get(matrix, 1); for (int i = 0; i &lt; tests.length; i++){ displayName = tests[i].getDisplayName(); refId = tests[i].getRefId(); Array.set(row0, i, displayName); Array.set(row1, i, refId); } System.out.println("tweet"); return Arrays.asList(matrix); // NOT SURE ABOUT THIS! } private String displayNameInput; private String refIdExpected; public ValidateDisplayNameReferenceIdTest(String input, String expected ) { displayNameInput = input; refIdExpected = expected; } @Test public void test() throws IOException { // send the API URL with 'displayNameInput', validate result for 'refIdExpected' URLConnection connection = new URL(url1 + displayNameInput + url2 + token).openConnection(); connection.setRequestProperty("Accept-Charset", charset); InputStream response = connection.getInputStream(); StringWriter writer = new StringWriter(); IOUtils.copy(response, writer); String responseString = writer.toString(); System.out.println(responseString); //Here goes something like assert(response.contains(refIdExpected)); } } </code></pre> <p>When I run this as is I get <code>java.lang.IllegalArgumentException: argument type mismatch at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</code>.</p> <p>I think I might be over-complicating the data structure, but now that it's built that way and seems to be successfully pulling in the data elements, I don't know how else to rebuild. Anyone see what I'm doing wrong here? </p> <p>Here's the whole gory exception:</p> <pre><code>java.lang.IllegalArgumentException: argument type mismatch at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTestUsingConstructorInjection(Parameterized.java:186) at org.junit.runners.Parameterized$TestClassRunnerForParameters.createTest(Parameterized.java:181) at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:244) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:241) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.junit.runners.Suite.runChild(Suite.java:127) at org.junit.runners.Suite.runChild(Suite.java:26) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.junit.runner.JUnitCore.run(JUnitCore.java:160) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) </code></pre>
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    1. COwhere / how is matrix defined? Also does the exception have any more information?
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    2. COI'll add it above. Right at the start of the class it's defined as `static Object matrix;` Exception added as well.
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    3. COHmm, question, which line is line 186?
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