[llvm] [llvm][llvm-lit] Add option to create unique result file names if results already exist (PR #112729)

[James Henderson via llvm-commits]

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@@ -0,0 +1,28 @@
+# Check that lit will not overwrite existing result files when given
+# --use-unique-output-file-name.
+
+# Files are overwritten without the option.
+# RUN: rm -f %t.xunit*.xml
+# RUN: echo "test" > %t.xunit.xml
+# RUN: not %{lit} --xunit-xml-output %t.xunit.xml %{inputs}/xunit-output
+# RUN: FileCheck < %t.xunit.xml %s --check-prefix=NEW
+
+# RUN: rm -f %t.xunit*.xml
+# RUN: echo "test" > %t.xunit.xml
+# Files should not be overwritten with the option.
+# RUN: not %{lit} --xunit-xml-output %t.xunit.xml --use-unique-output-file-name %{inputs}/xunit-output
+# RUN: FileCheck < %t.xunit.xml %s --check-prefix=EXISTING
+# EXISTING: test
+# Results in a new file with "1" added.
+# RUN: FileCheck < %t.xunit.1.xml %s --check-prefix=NEW
+# NEW:      <?xml version="1.0" encoding="UTF-8"?>
+# NEW-NEXT: <testsuites time="{{[0-9.]+}}">
+# (assuming that other tests check the whole contents of the file)
+
+# The number should increment as many times as needed.
+# RUN: touch %t.xunit.2.xml
+# RUN: touch %t.xunit.3.xml
+# RUN: touch %t.xunit.4.xml
+
+# RUN: not %{lit} --xunit-xml-output %t.xunit.xml --use-unique-output-file-name %{inputs}/xunit-output
+# RUN: FileCheck < %t.xunit.5.xml %s --check-prefix=NEW
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jh7370 wrote:

Nit: missing new line at EOF.

https://github.com/llvm/llvm-project/pull/112729