Kotlin sample: unit test in common module

Problem 1: test run fails in IntelliJ IDEA 2018.1

1. Checkout common-test-fails-in-IDE
2. Open project and import gradle main module (auto import whole project)
3. Run SampleTest.kt via context menu
4. Error: No JDK specified

Temporary fix:

• Configure JDK as module SDK (instead of Kotlin SDK)
• However, any gradle-refresh will restore the old setting (Kotlin SDK)

Problem 2: common test not runnable in IntelliJ IDEA 2018.1

1. Checkout common-test-not-runnable-in-IDE
2. Open project and import gradle main module (auto import whole project)
3. Open context menu of SampleTest.kt: no run-option available

Temporary fix:

• Add a test file to the JVM module (checkout common-test-fails-in-IDE)
• Now the run-option is available for the JVM test file as well as the common test file

Problem 3: common test function and class reported as "missing documentation" in IntelliJ IDEA 2018.1.6

1. Checkout common-test-missing-doc-warning
2. Open project and import gradle main module (auto import whole project)
3. Open file SampleTest.kt: There are 3 inspection warnings
   • The class is missing documentation
   • The test-method is missing documentation
   • The test-method should not contain underscores
4. Open file SampleJvmTest.kt: No inspection warnings at all though similar content