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-rw-r--r--testament/categories.nim4
-rw-r--r--testament/testament.nim3
2 files changed, 4 insertions, 3 deletions
diff --git a/testament/categories.nim b/testament/categories.nim
index ffee5eeb3..f1dee3570 100644
--- a/testament/categories.nim
+++ b/testament/categories.nim
@@ -665,8 +665,8 @@ proc runJoinedTest(r: var TResults, cat: Category, testsDir: string, options: st
 
   if buf != outputExpected:
     writeFile(outputExceptedFile, outputExpected)
-    discard execShellCmd("diff -uNdr $1 $2" % [outputExceptedFile, outputGottenFile])
-    echo failString & "megatest output different!"
+    echo diffFiles(outputGottenFile, outputExceptedFile).output
+    echo failString & "megatest output different, see $1 vs $2" % [outputGottenFile, outputExceptedFile]
     # outputGottenFile, outputExceptedFile not removed on purpose for debugging.
     quit 1
   else:
diff --git a/testament/testament.nim b/testament/testament.nim
index 9caa3f6b9..0607ac41d 100644
--- a/testament/testament.nim
+++ b/testament/testament.nim
@@ -17,6 +17,7 @@ from std/sugar import dup
 import compiler/nodejs
 import lib/stdtest/testutils
 from lib/stdtest/specialpaths import splitTestFile
+from std/private/gitutils import diffStrings
 
 proc trimUnitSep(x: var string) =
   let L = x.len
@@ -307,7 +308,7 @@ proc addResult(r: var TResults, test: TTest, target: TTarget,
       maybeStyledEcho styleBright, expected, "\n"
       maybeStyledEcho fgYellow, "Gotten:"
       maybeStyledEcho styleBright, given, "\n"
-
+      echo diffStrings(expected, given).output
 
   if backendLogging and (isAppVeyor or isAzure):
     let (outcome, msg) =