英文:
Debugging SCollection contents when running tests
问题
有没有办法在运行单元测试（PipelineSpec）时查看 SCollection 的内容？
在许多机器上生产环境运行时，没有办法在一台机器上查看整个集合的内容，但我想知道是否有办法查看 SCollection 的内容（例如，在 IntelliJ 的调试模式下运行单元测试时）。
英文:
Is there any way to view the contents of an SCollection when running a unit test (PipelineSpec)?
When running something in production on many machines there would be no way to see the entire collection in one machine, but I wonder is there a way to view the contents of an SCollection (for example when running a unit test in debug mode in intellij).
答案1
得分: 1
如果您想将调试语句打印到控制台，可以使用debug方法，该方法是SCollections的一部分。下面是示例代码：
val stdOutMock = new MockedPrintStream
Console.withOut(stdOutMock) {
runWithContext { sc =>
val r = sc.parallelize(1 to 3).debug(prefix = "==")
r should containInAnyOrder(Seq(1, 2, 3))
}
}
stdOutMock.message.filterNot(_ == "\n") should contain theSameElementsAs
Seq("==1", "==2", "==3")
英文:
If you want to print debug statements to the console then you can use the debug method which is part of SCollections. A sample code shown below
val stdOutMock = new MockedPrintStream
Console.withOut(stdOutMock) {
runWithContext { sc =>
val r = sc.parallelize(1 to 3).debug(prefix = "===")
r should containInAnyOrder(Seq(1, 2, 3))
}
}
stdOutMock.message.filterNot(_ == "\n") should contain theSameElementsAs
Seq("===1", "===2", "===3")
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