diff --git a/tests/test-diff-change.out b/tests/test-diff-change.out
deleted file mode 100644
--- a/tests/test-diff-change.out
+++ /dev/null
@@ -1,30 +0,0 @@
-invoking hg diff --nodates --change 1:
-diff -r 4bb65dda5db4 -r e9b286083166 file.txt
---- a/file.txt
-+++ b/file.txt
-@@ -1,1 +1,1 @@
--first
-+second
-
-invoking hg diff --nodates --change e9b286083166:
-diff -r 4bb65dda5db4 -r e9b286083166 file.txt
---- a/file.txt
-+++ b/file.txt
-@@ -1,1 +1,1 @@
--first
-+second
-
-invoking hg diff --nodates --change 6:
-diff -r e8a0797e73a6 -r aa9873050139 file.txt
---- a/file.txt
-+++ b/file.txt
-@@ -6,6 +6,6 @@
- 5
- 6
- 7
--8
-+y
- 9
- 10
-
-EOF
diff --git a/tests/test-diff-change b/tests/test-diff-change.t
old mode 100755
new mode 100644
rename from tests/test-diff-change
rename to tests/test-diff-change.t
--- a/tests/test-diff-change
+++ b/tests/test-diff-change.t
@@ -1,63 +1,86 @@
-#!/bin/sh -e
+Testing diff --change
 
-# test of hg diff --change
-
-set -e
+  $ hg init a
+  $ cd a
 
-ec() {
-	echo "invoking $@:"
-	"$@"
-}
+  $ echo "first" > file.txt
+  $ hg add file.txt
+  $ hg commit -m 'first commit' # 0
 
-hg init a
-cd a
+  $ echo "second" > file.txt
+  $ hg commit -m 'second commit' # 1
+
+  $ echo "third" > file.txt
+  $ hg commit -m 'third commit' # 2
 
-echo "first" > file.txt
-hg add file.txt
-hg commit -m 'first commit' # 0
-
-echo "second" > file.txt
-hg commit -m 'second commit' # 1
+  $ hg diff --nodates --change 1
+  diff -r 4bb65dda5db4 -r e9b286083166 file.txt
+  --- a/file.txt
+  +++ b/file.txt
+  @@ -1,1 +1,1 @@
+  -first
+  +second
 
-echo "third" > file.txt
-hg commit -m 'third commit' # 2
+  $ hg diff --change e9b286083166
+  diff -r 4bb65dda5db4 -r e9b286083166 file.txt
+  --- a/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,1 +1,1 @@
+  -first
+  +second
 
-ec hg diff --nodates --change 1
 
-echo
+Testing diff --change when merge:
 
-#rev=$(hg log -r 1 --template '{node|short}')
-rev=e9b286083166
-ec hg diff --nodates --change "$rev"
+  $ for i in 1 2 3 4 5 6 7 8 9 10; do
+  $    echo $i >> file.txt
+  $ done
+  $ hg commit -m "lots of text" # 3
+
+  $ sed -e 's,^2$,x,' file.txt > file.txt.tmp
+  $ mv file.txt.tmp file.txt
+  $ hg commit -m "change 2 to x" # 4
 
-##
-# Testing diff -c when merge
+  $ hg up -r 3
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ sed -e 's,^8$,y,' file.txt > file.txt.tmp
+  $ mv file.txt.tmp file.txt
+  $ hg commit -m "change 8 to y"
+  created new head
 
-for i in 1 2 3 4 5 6 7 8 9 10; do
-    echo $i >> file.txt
-done
-hg commit -m "lots of text" # 3
-
-sed -e 's,^2$,x,' file.txt > file.txt.tmp
-mv file.txt.tmp file.txt
-hg commit -m "changed 2 to x" # 4
+  $ hg up -C -r 4
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg merge -r 5
+  merging file.txt
+  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ hg commit -m "merge 8 to y" # 6
 
-hg up -r 3 > /dev/null 2>&1 # updated, merged, removed, unresolved
-sed -e 's,^8$,y,' file.txt > file.txt.tmp
-mv file.txt.tmp file.txt
-hg commit -m "change 8 to y" > /dev/null 2>&1 # 5 # created new head
-
-hg up -C -r 4 > /dev/null 2>&1 # updated, merged, removed, unresolved
-hg merge -r 5 > /dev/null 2>&1 # updated, merged, removed, unresolved
-hg commit -m "merging 8 to y" # 6
+  $ hg diff --change 5
+  diff -r ae119d680c82 -r 9085c5c02e52 file.txt
+  --- a/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  @@ -6,6 +6,6 @@
+   5
+   6
+   7
+  -8
+  +y
+   9
+   10
 
-echo
-ec hg diff --nodates --change 6 # must be similar to hg diff --nodates --change 5
+must be similar to 'hg diff --change 5':
 
-#echo
-#hg log
+  $ hg diff -c 6
+  diff -r 273b50f17c6d -r 979ca961fd2e file.txt
+  --- a/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/file.txt	Thu Jan 01 00:00:00 1970 +0000
+  @@ -6,6 +6,6 @@
+   5
+   6
+   7
+  -8
+  +y
+   9
+   10
 
-echo
-echo "EOF"
-
-# vim: set ts=4 sw=4 et: