test-command-template: test the phase template more precisely

The current test that greps for "phase:" only checks that the word
"phase" is in the output, but does not test that nothing else gets
added by this template. This improves these tests by showing a unified

tests/test-command-template.t

@@ -108,32 +108,52 b' as default style, except for extra phase'
   $ hg log --style default > style.out
   $ cmp log.out style.out || diff -u log.out style.out
   $ hg log -T phases > phases.out
-  $ diff -u log.out phases.out | grep "phase:"
+  $ diff -U 0 log.out phases.out | grep -v '^---\|^+++'
+  @@ -2,0 +3 @@
   +phase:       draft
+  @@ -6,0 +8 @@
   +phase:       draft
+  @@ -11,0 +14 @@
   +phase:       draft
+  @@ -17,0 +21 @@
   +phase:       draft
+  @@ -24,0 +29 @@
   +phase:       draft
+  @@ -31,0 +37 @@
   +phase:       draft
+  @@ -36,0 +43 @@
   +phase:       draft
+  @@ -41,0 +49 @@
   +phase:       draft
+  @@ -46,0 +55 @@
   +phase:       draft
+  @@ -51,0 +61 @@
   +phase:       draft
 
   $ hg log -v > log.out
   $ hg log -v --style default > style.out
   $ cmp log.out style.out || diff -u log.out style.out
   $ hg log -v -T phases > phases.out
-  $ diff -u log.out phases.out | grep phase:
+  $ diff -U 0 log.out phases.out | grep -v '^---\|^+++'
+  @@ -2,0 +3 @@
   +phase:       draft
+  @@ -7,0 +9 @@
   +phase:       draft
+  @@ -15,0 +18 @@
   +phase:       draft
+  @@ -24,0 +28 @@
   +phase:       draft
+  @@ -33,0 +38 @@
   +phase:       draft
+  @@ -43,0 +49 @@
   +phase:       draft
+  @@ -50,0 +57 @@
   +phase:       draft
+  @@ -58,0 +66 @@
   +phase:       draft
+  @@ -66,0 +75 @@
   +phase:       draft
+  @@ -77,0 +87 @@
   +phase:       draft
 
   $ hg log -q > log.out
@@ -160,32 +180,52 b' Default style should also preserve color'
   $ hg --color=debug log --style default > style.out
   $ cmp log.out style.out || diff -u log.out style.out
   $ hg --color=debug log -T phases > phases.out
-  $ diff -u log.out phases.out | grep phase:
+  $ diff -U 0 log.out phases.out | grep -v '^---\|^+++'
+  @@ -2,0 +3 @@
   +[log.phase|phase:       draft]
+  @@ -6,0 +8 @@
   +[log.phase|phase:       draft]
+  @@ -11,0 +14 @@
   +[log.phase|phase:       draft]
+  @@ -17,0 +21 @@
   +[log.phase|phase:       draft]
+  @@ -24,0 +29 @@
   +[log.phase|phase:       draft]
+  @@ -31,0 +37 @@
   +[log.phase|phase:       draft]
+  @@ -36,0 +43 @@
   +[log.phase|phase:       draft]
+  @@ -41,0 +49 @@
   +[log.phase|phase:       draft]
+  @@ -46,0 +55 @@
   +[log.phase|phase:       draft]
+  @@ -51,0 +61 @@
   +[log.phase|phase:       draft]
 
   $ hg --color=debug -v log > log.out
   $ hg --color=debug -v log --style default > style.out
   $ cmp log.out style.out || diff -u log.out style.out
   $ hg --color=debug -v log -T phases > phases.out
-  $ diff -u log.out phases.out | grep phase:
+  $ diff -U 0 log.out phases.out | grep -v '^---\|^+++'
+  @@ -2,0 +3 @@
   +[log.phase|phase:       draft]
+  @@ -7,0 +9 @@
   +[log.phase|phase:       draft]
+  @@ -15,0 +18 @@
   +[log.phase|phase:       draft]
+  @@ -24,0 +28 @@
   +[log.phase|phase:       draft]
+  @@ -33,0 +38 @@
   +[log.phase|phase:       draft]
+  @@ -43,0 +49 @@
   +[log.phase|phase:       draft]
+  @@ -50,0 +57 @@
   +[log.phase|phase:       draft]
+  @@ -58,0 +66 @@
   +[log.phase|phase:       draft]
+  @@ -66,0 +75 @@
   +[log.phase|phase:       draft]
+  @@ -77,0 +87 @@
   +[log.phase|phase:       draft]
 
   $ hg --color=debug -q log > log.out