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POMocking groovy new File.eachFile()
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copied!<p>I'm having trouble mocking file.eachFile() {}.</p> <p>I'm trying to mock the files that get returned from file.eachFile{} - i don't want to actually test the contents of a real directory on my drive.</p> <p>I don't see how i can achive this using <strong>Spock</strong>(as i understand it's used more for mock verification).</p> <p>So, i decided to use the "native" <strong>Groovy</strong> <em>mock capabilities</em>, and the <strong>MOP</strong> capabilities. No luck.</p> <p>For example(i had to remove the File type in order to pass the object to the testing funcion):</p> <pre><code>def mockFile = new MockFor(java.io.File) mockFile.demand.eachFile {[new File("script1.sql"), new File("script2.syn"), new File("script3.grt")].each {it}} </code></pre> <p>Or(using metaclass):</p> <pre><code>File mockFile = new File("irrelevant_path") mockFile.metaClass.eachFile = {[new File("script1.sql"), new File("script2.syn"), new File("script3.grt")].each {it}} </code></pre> <p>I eachFile method is defined as:</p> <pre><code>public static void eachFile(final File self, final Closure closure) throws FileNotFoundException, IllegalArgumentException { eachFile(self, FileType.ANY, closure); } </code></pre> <p>I'm already a litty bit fuzzy from all the coding attempts to mock this :)</p> <p>I managed to reach the method(no runtime exceptions), but am unable to actually see the injection of the File list as defined beforehand.</p> <p>The tested method is(for simplicity):</p> <pre><code>folderSourceScripts.eachFile {File currentFile -> ..... } </code></pre> <p>In Java, Mockito would do this in a minute, but i read somewhere that there were some issues regarding integration with Groovy. There is a problem when mocking the classes because Groovy makes a call to the Metaclass.</p> <p>I saw this <a href="http://groovy.329449.n5.nabble.com/Is-anyone-using-Mockito-to-Mock-Groovy-Classes-in-Groovy-Test-Cases-td370887.html" rel="nofollow">here</a>.</p> <p><strong>tim_yates</strong> wrote:</p> <pre><code>def mock = new MockFor(File) mock.demand.eachFile { [new File("script1.sql"), new File("script2.syn"), new File("script3.grt")].each { (it) } } mock.use { new File('.').eachFile {file -> println "$file" } </code></pre> <p>The script works, but there's a catch when using it in the test.</p> <p>As i mentioned, i'm using Spock and the file variable is passed in a method. So using it the way you wrote it causes:</p> <pre><code>groovy.lang.MissingMethodException: No signature of method: groovy.mock.interceptor.MockFor.eachFile() is applicable for argument types: ... </code></pre> <p>I'm guessing thats because there isnt direct usage of File.eachFile() in the code(it doesn't pass the mock to the method, it expects the mock to be instantiated in the "use" block)?</p> <p>The code in the test looks like this: </p> <pre><code>when: mock.use { folderValidator.validate(mock) } then: folderValidator.listMissingFiles.size == 3 </code></pre> <p>The problem with proxyInstance(), which should pass the mock into the method is, as the example will show:</p> <pre><code>when: folderValidator.validate(mockProxy) then: folderValidator.listMissingFiles.size == 3 </code></pre> <p>When the mock is passed, groovy can't instantiate the class, because it doesn't know which constructor to use?</p> <pre><code>org.codehaus.groovy.runtime.metaclass.MethodSelectionException: Could not find which method <init>() to invoke from this list: private java.io.File#<init>(java.lang.String, int) private java.io.File#<init>(java.lang.String, java.io.File) public java.io.File#<init>(java.lang.String) public java.io.File#<init>(java.net.URI) public java.io.File#<init>(java.io.File, java.lang.String) public java.io.File#<init>(java.lang.String, java.lang.String) </code></pre> <p>In theory it does the work, but in this example it fails, maybe I'm coding it wrong. I started using Groovy two weeks ago, so im still getting used to it. Thanks</p>

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