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Introduction
Seeing full stack traces in ScalaTest can be crucial for debugging, especially when working with build tools like Mill. It's common to encounter truncated error messages that make it difficult to identify the root cause of an issue. In this article, we'll explore how to configure ScalaTest to display full stack traces, while addressing some common pitfalls associated with using the Mill build tool.
Understanding the Issue
When you run tests in ScalaTest using Mill, you might be inclined to use the -oD option to get more detailed output. However, this will sometimes result in an error, indicating that an unknown argument has been passed. The challenge arises from misconfiguration and the specific requirements of how Mill handles ScalaTest arguments.
Why It Happens
The key thing to understand is that Mill has its own way of passing arguments to the underlying testing frameworks like ScalaTest. If you attempt to run your tests with options that aren't recognized by Mill, it will throw an error, as you've seen with the Unknown argument: "-o" message. This can be frustrating, especially when you need detailed insights into test failures.
Step-by-Step Solution to Enable Full Stack Traces
To configure ScalaTest with Mill to show full stack traces, follow these organized steps:
Step 1: Modify Your Build Definition
Start by ensuring that your Mill build definitions properly set up ScalaTest with the necessary configurations. You will want to specify arguments that are compatible with Mill. Here’s how to structure your test setup in the build.sc file:
import mill._
import mill.scalalib._
object myModule extends ScalaModule {
def scalaVersion = "2.13.8"
def testFrameworks = Seq(new TestFramework("org.scalatest.tools.Framework"))
def testArgs = Seq("-oD") // Set desired options here
}
This setup ensures that you are using ScalaTest as a corresponding test framework with Mill. The testArgs method has been included for passing specific command-line options.
Step 2: Run Your Tests with the Correct Command
With your Mill project set up as above, run your tests with the following command in your terminal:
./mill myModule.test
Note that we omit -oD in the command when invoking it. Instead, it will automatically take the arguments we've defined in the build configuration. If you've properly set up everything, you should now see complete stack traces on test failures.
Step 3: Verify Test Output
If configured correctly, your test output should now display full stack traces, providing the necessary context to debug effectively. Be sure to look for details such as the specific line numbers and error messages within the tests.
Frequently Asked Questions (FAQ)
Why am I still getting truncated stack traces?
If you're still experiencing issues with truncated output, double-check the configuration in your build.sc file to ensure that the testArgs method is defined correctly and that you're using the right ScalaTest version compatible with your Scala version.
Can I pass additional options to ScalaTest?
, you can include other optional arguments in the testArgs sequence, such as verbosity or filter options to further refine the test output.
What versions of Scala and ScalaTest should I use?
Make sure that your Scala and ScalaTest versions are compatible. ScalaTest provides documentation to help you identify the correct versions that work seamlessly together. It’s ideal to use a more recent version of ScalaTest to avoid compatibility issues.
Conclusion
Configuring ScalaTest to show full stack traces while using Mill is a straightforward process as long as you get the build configuration correct. By adjusting your build.sc file settings and running the appropriate commands, you can ensure you have insight into the details of any errors that occur during testing. With the right error messages, troubleshooting becomes a much more manageable task, saving you time and effort in your development workflow.
Seeing full stack traces in ScalaTest can be crucial for debugging, especially when working with build tools like Mill. It's common to encounter truncated error messages that make it difficult to identify the root cause of an issue. In this article, we'll explore how to configure ScalaTest to display full stack traces, while addressing some common pitfalls associated with using the Mill build tool.
Understanding the Issue
When you run tests in ScalaTest using Mill, you might be inclined to use the -oD option to get more detailed output. However, this will sometimes result in an error, indicating that an unknown argument has been passed. The challenge arises from misconfiguration and the specific requirements of how Mill handles ScalaTest arguments.
Why It Happens
The key thing to understand is that Mill has its own way of passing arguments to the underlying testing frameworks like ScalaTest. If you attempt to run your tests with options that aren't recognized by Mill, it will throw an error, as you've seen with the Unknown argument: "-o" message. This can be frustrating, especially when you need detailed insights into test failures.
Step-by-Step Solution to Enable Full Stack Traces
To configure ScalaTest with Mill to show full stack traces, follow these organized steps:
Step 1: Modify Your Build Definition
Start by ensuring that your Mill build definitions properly set up ScalaTest with the necessary configurations. You will want to specify arguments that are compatible with Mill. Here’s how to structure your test setup in the build.sc file:
import mill._
import mill.scalalib._
object myModule extends ScalaModule {
def scalaVersion = "2.13.8"
def testFrameworks = Seq(new TestFramework("org.scalatest.tools.Framework"))
def testArgs = Seq("-oD") // Set desired options here
}
This setup ensures that you are using ScalaTest as a corresponding test framework with Mill. The testArgs method has been included for passing specific command-line options.
Step 2: Run Your Tests with the Correct Command
With your Mill project set up as above, run your tests with the following command in your terminal:
./mill myModule.test
Note that we omit -oD in the command when invoking it. Instead, it will automatically take the arguments we've defined in the build configuration. If you've properly set up everything, you should now see complete stack traces on test failures.
Step 3: Verify Test Output
If configured correctly, your test output should now display full stack traces, providing the necessary context to debug effectively. Be sure to look for details such as the specific line numbers and error messages within the tests.
Frequently Asked Questions (FAQ)
Why am I still getting truncated stack traces?
If you're still experiencing issues with truncated output, double-check the configuration in your build.sc file to ensure that the testArgs method is defined correctly and that you're using the right ScalaTest version compatible with your Scala version.
Can I pass additional options to ScalaTest?
, you can include other optional arguments in the testArgs sequence, such as verbosity or filter options to further refine the test output.What versions of Scala and ScalaTest should I use?
Make sure that your Scala and ScalaTest versions are compatible. ScalaTest provides documentation to help you identify the correct versions that work seamlessly together. It’s ideal to use a more recent version of ScalaTest to avoid compatibility issues.
Conclusion
Configuring ScalaTest to show full stack traces while using Mill is a straightforward process as long as you get the build configuration correct. By adjusting your build.sc file settings and running the appropriate commands, you can ensure you have insight into the details of any errors that occur during testing. With the right error messages, troubleshooting becomes a much more manageable task, saving you time and effort in your development workflow.