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POHow to mock object inside of static method?
 

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  1. POHow to mock object inside of static method?
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    <p>I'm trying to mock static method inside of static method.</p> <p>I wonder if it is possible <strong>without using any framework</strong>.</p> <p>Below is what I have tried.</p> <p><strong>Goal:</strong> Mock ImageIO object so that I know what to expect for return value.</p> <pre><code>class Foo { public static SomeObject Run(String path) { File file = new File(path); BufferedImage buff = ImageIO.read(file); SomeObject some = new SomeObject(buff); return some; } } </code></pre> <p>I first tried using interface and create a wrapper for ImageIO.</p> <pre><code> interface ImageReader { public BufferedImage read(File file); } class RealReader implements ImageReader { @Override public BufferedImage read(File file) { return ImageIO.read(file); } } class MockReader implements ImageReader { @Override public BufferedImage read(File file) { BufferedImage buff = new BufferedImage(0,0,0); //do whatever I like here and return the buff return buff; } } class Foo { public static SomeObject run(String path) { File file = new File(path); //ImageIO wrapper ImageReader reader = getImageReader(); BufferedImage buff = reader.read(file); SomeObject some = new SomeObject(buff); return some; } public static getImageReader() { return RealReader(); } } </code></pre> <p>And I tried to override static getImageReader() so that I can return MockReader object which then call mock version of read() method:</p> <pre><code>class MockFoo { @Override public static getImageReader() { return MockReader(); } } </code></pre> <p><strong>This is my test code:</strong></p> <pre><code>public void TestRun() { MockFoo foo = new MockFoo(); foo.run(); } </code></pre> <p>Then I figured I can't override static method getImageReader()......</p> <p>Is there a way to achieve my goal?</p>
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