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Test UX in continuous integration #17783

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@som-snytt

Description

@som-snytt

It would be nice if vulpix revealed the failed diff. (It performs a diff and not a simple strcmp.)

For this test suite or group below, there is no indication which "script" file failed.

It would be superlative to summarize at the end, as opposed to scrolling back through output.

I think a differentiating char in the first column is easier to scan for, if I must scan:

!!! expected =========>

Even better in red.

Sample output:

[info] Test dotty.tools.repl.ScriptedTests.replTests started
expected =========>
// scalac: -source:future -deprecation
scala> type M[X] = X match { case Int => String case _ => Int }
1 warning found
-- Deprecation Warning: --------------------------------------------------------
1 | type M[X] = X match { case Int => String case _ => Int }
  |                                               ^
  |        `_` is deprecated for wildcard arguments of types: use `?` instead
scala> type N[X] = X match { case List[_] => Int }
1 warning found
-- Deprecation Warning: --------------------------------------------------------
1 | type N[X] = X match { case List[_] => Int }
  |                                 ^
  |        `_` is deprecated for wildcard arguments of types: use `?` instead
actual ===========>
// scalac: -source:future -deprecation
scala> type M[X] = X match { case Int => String case _ => Int }
scala> type N[X] = X match { case List[_] => Int }
1 warning found
-- Deprecation Warning: --------------------------------------------------------
1 | type N[X] = X match { case List[_] => Int }
  |                                 ^
  |        `_` is deprecated for wildcard arguments of types: use `?` instead
Error:  Test dotty.tools.repl.ScriptedTests.replTests failed: java.lang.AssertionError: Error in script /__w/dotty/dotty/out/bootstrap/scala3-compiler-bootstrapped/scala-3.1.2-RC1-bin-SNAPSHOT-nonbootstrapped/test-classes/repl/i13208.scala, expected output did not match actual, took 8.573 sec
Error:      at dotty.tools.repl.ReplTest.testScript(ReplTest.scala:97)
Error:      at dotty.tools.repl.ReplTest.testFile(ReplTest.scala:42)
Error:      at dotty.tools.repl.ScriptedTests.replTests$$anonfun$1(ScriptedTests.scala:11)
Error:      at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
Error:      at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
Error:      at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1328)
Error:      at dotty.tools.repl.ScriptedTests.replTests(ScriptedTests.scala:11)
Error:      at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Error:      at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
Error:      at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Error:      at java.lang.reflect.Method.invoke(Method.java:567)
Error:      ...

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