GeneratedFiles.UpdateGeneratedFiles fails on MacOS

[ RUN ] GeneratedFiles.UpdateGeneratedFiles
generatedfiles-test.cpp:60: Failure
Value of: generatedFiles.fileContainers()
Expected: has 4 elements where
element #0 is equal to ((/file1, 0), [], 0, "content1b"),
element #1 is equal to ((/file2, 0), [], 0, "content2b"),
element #2 is equal to ((/file3, 0), [], 0, "content3"),
element #3 is equal to ((/file4, 0), [], 0, "content4")
Actual:

{ ((/file1, 0), [], 0, "content1b"), ((/file1, 0), [], 0, "content1"), ((/file2, 0), [], 0, "content2b"), ((/file3, 0), [], 0, "content3"), ((/file4, 0), [], 0, "content4") }

, which has 5 elements
[ FAILED ] GeneratedFiles.UpdateGeneratedFiles (0 ms)