Just been playing around for the first time with IntelliJ IDEA Community edition, first time I have worked with it so if I\'m missing something, please excuse me.
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I had this problem (in Android Studio but its a customised IntelliJ) and the reason was WHERE the cursor was when I ran tests using CTRL-SHIFT-F10.
@Parameterized.Parameters public static Collection data()
Once I moved the cursor into a test method or not inside any method, it worked.