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Add Troubleshooting section to README #418

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29 changes: 29 additions & 0 deletions README.md
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Expand Up @@ -256,3 +256,32 @@ error message.
## Contributing to assertk

Contributions are more than welcome! Please see the [Contributing Guidelines](https://github.com/willowtreeapps/assertk/blob/main/Contributing.md) and be mindful of our [Code of Conduct](https://github.com/willowtreeapps/assertk/blob/main/code-of-conduct.md).

## Troubleshooting

### I'm seeing a java.lang.NoClassDefFoundError: org/opentest4j/AssertionFailedError

It might happen that your tests are failing with something like:

```
java.lang.AssertionError: java.lang.NoClassDefFoundError: org/opentest4j/AssertionFailedError

at me.tatarka.open4jideissuetest.ExampleUnitTest.addition_isCorrect(ExampleUnitTest.kt:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
[...]
```

It's a [known issue](https://youtrack.jetbrains.com/issue/IDEA-214533) and there is a workaround. You can add:

```
testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.1")
```
or
```
testImplemetation("org.opentest4j:opentest4j:1.1.1")
```

to your `build.gradle*` file 👍