else
                printf '%s\n' "$2" | tr '|' '\012' >expected
        fi
-       diff -u expected actual
+       test_cmp expected actual
 }
 
 test_expect_success \
       (cd "$GIT_DIR" &&
       GIT_DIR=. git cvsexportcommit -w "$CVSWORK" -c $id &&
       check_entries "$CVSWORK/W" "file1.txt/1.1/|file2.txt/1.1/" &&
-      diff -u "$CVSWORK/W/file1.txt" ../W/file1.txt &&
-      diff -u "$CVSWORK/W/file2.txt" ../W/file2.txt
+      test_cmp "$CVSWORK/W/file1.txt" ../W/file1.txt &&
+      test_cmp "$CVSWORK/W/file2.txt" ../W/file2.txt
       )
 '
 
        git cvsexportcommit -w "$CVSWORK" -c $id &&
        check_entries "$CVSWORK/E" "DS/1.1/|newfile5.txt/1.1/" &&
        check_entries "$CVSWORK" "DS/1.1/|release-notes/1.2/" &&
-       diff -u "$CVSWORK/DS" DS &&
-       diff -u "$CVSWORK/E/DS" E/DS &&
-       diff -u "$CVSWORK/release-notes" release-notes
+       test_cmp "$CVSWORK/DS" DS &&
+       test_cmp "$CVSWORK/E/DS" E/DS &&
+       test_cmp "$CVSWORK/release-notes" release-notes
 
 '
 
        id=$(git rev-parse HEAD) &&
        git cvsexportcommit -w "$CVSWORK" -c $id &&
        check_entries "$CVSWORK" " space/1.1/|DS/1.1/|release-notes/1.2/" &&
-       diff -u "$CVSWORK/ space" " space"
+       test_cmp "$CVSWORK/ space" " space"
+
+'
+
+test_expect_success 'use the same checkout for Git and CVS' '
+
+       (mkdir shared &&
+        cd shared &&
+        unset GIT_DIR &&
+        cvs co . &&
+        git init &&
+        git add " space" &&
+        git commit -m "fake initial commit" &&
+        echo Hello >> " space" &&
+        git commit -m "Another change" " space" &&
+        git cvsexportcommit -W -p -u -c HEAD &&
+        grep Hello " space" &&
+        git diff-files)
 
 '