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POIs it possible to use partial mocking for private static methods in PowerMock?
 

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  1. POIs it possible to use partial mocking for private static methods in PowerMock?
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    <p>From the examples on the <a href="http://code.google.com/p/powermock/wiki/MockitoUsage13#A_full_example_of_partial_mocking_of_a_private_method%20PowerMock%20website">PowerMock homepage</a>, I see the following example for partially mocking a private method with Mockito:</p> <pre><code>@RunWith(PowerMockRunner.class) // We prepare PartialMockClass for test because it's final or we need to mock private or static methods @PrepareForTest(PartialMockClass.class) public class YourTestCase { @Test public void privatePartialMockingWithPowerMock() { PartialMockClass classUnderTest = PowerMockito.spy(new PartialMockClass()); // use PowerMockito to set up your expectation PowerMockito.doReturn(value).when(classUnderTest, "methodToMock", "parameter1"); // execute your test classUnderTest.execute(); // Use PowerMockito.verify() to verify result PowerMockito.verifyPrivate(classUnderTest, times(2)).invoke("methodToMock", "parameter1"); } </code></pre> <p>However, this approach does not seem to work when the private method we wish to mock is static. I wish to create a partial mock of the below class, with the readFile method mocked:</p> <pre><code>package org.rich.powermockexample; import java.io.File; import java.io.IOException; import java.nio.charset.Charset; import java.util.List; import static com.google.common.io.Files.readLines; public class DataProvider { public static List&lt;String&gt; getData() { List&lt;String&gt; data = null; try { data = readFile(); } catch (IOException e) { e.printStackTrace(); } return data; } private static List&lt;String&gt; readFile() throws IOException { File file = new File("/some/path/to/file"); List&lt;String&gt; lines = readLines(file, Charset.forName("utf-8")); return lines; } } </code></pre> <p>Please could someone let me know how this can be achieved?</p>
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    1. COWhy, exactly? In other words, what can't you simulate by mocking only getData?
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    2. COI could - but I wanted to see whether it is possible to handle private static methods in a partial mock with PowerMock.
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    3. COOh. I'd have to look up the mechanics, but AFAIK yes, via byte-code manipulation, same way you can, say, mock out or replace a constructor.
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