How to do Eclipse style TDD with Intellij

Question

I just bought a copy of Intellij and I need to generate a unit test stub and put junit on the classpath and set the test to execute with the junit runner. It's trivial to do so in Eclipse.

Every instruction I read looks like this...

1. Create a class to test
2. Add method
3. Create a test source root
4. Create a test class
5. Run test

But I do not want to create any class, or any Method until I have a Test that won't compile.

I want to layout the Class and method stubs first in a test. Once I am satisfied with the API I've expressed in the test I want to auto generate the Class and Method declarations, and then begin with the assertions.

How to do this in Intellij?

Answer 1

Create a test folder and add a new test class, for example WhateverTest.java

Add a new method that has an @Test annotation.

@Test
public static void whatever() {
}

After you import all the required JUnit dependencies (and the ones you want), you can simply tell intellij to run the tests in the class. I don't think you have to do any special configuration beyond that.

Answer 2

IntelliJ IDEA does not support the auto-generation of main classes from test classes. It will auto generate test classes and methods from a main class. So you could do as @yshavit recommends in his comment and create a main class skeleton and then auto generate the test class via Ctrl+Shift+T. Or as you write your test, keep an interface in sync with it. Then you can auto generate an implementation from the interface.

Otherwise, as I see it, you have three options:

1. Open a feature request for auto-generating production classes from test classes
2. Write your own plug-in to do this
3. Ask the author of an existing plug-in, such as the Enso TDD focused plug-in, to add this feature.