Ignore filemode in diff (#1819)

Author: Ailrun

hls-test-utils/src/Test/Hls.hs

@@ -62,7 +62,7 @@ defaultTestRunner :: TestTree -> IO ()
 defaultTestRunner = defaultMainWithRerun . adjustOption (const $ mkTimeout 600000000)
 
 gitDiff :: FilePath -> FilePath -> [String]
-gitDiff fRef fNew = ["git", "diff", "--no-index", "--text", "--exit-code", fRef, fNew]
+gitDiff fRef fNew = ["git", "-c", "core.fileMode=false", "diff", "--no-index", "--text", "--exit-code", fRef, fNew]
 
 goldenGitDiff :: TestName -> FilePath -> IO ByteString -> TestTree
 goldenGitDiff name = goldenVsStringDiff name gitDiff