Make the fake "editor" store output of grep in a file so that we can
see how many diffs were contained in the message and use them in
individual tests where ever it is required. A subsequent commit will
introduce scenarios where it is important to be able to exactly
determine how many diffs were present.

Also use write_script() to create the fake "editor".

The fake "editor" is always made to succeed regardless of whether grep
found diff headers or not so that we don't have to use 'test_must_fail'
for which 'test_line_count = 0' is an easy substitute.

Helped-by: Eric Sunshine <sunsh...@sunshineco.com>
Signed-off-by: Pranit Bauva <pranit.ba...@gmail.com>

---
Previous version of this patch:
 - [v12] : $gmane/288820
 - [v11] : $gmane/288820
 - [v10]: $gmane/288820

Changes this version wrt previous one:
Change the commit message as suggested by Eric
---
 t/t7507-commit-verbose.sh | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/t/t7507-commit-verbose.sh b/t/t7507-commit-verbose.sh
index 2ddf28c..0f28a86 100755
--- a/t/t7507-commit-verbose.sh
+++ b/t/t7507-commit-verbose.sh
@@ -3,11 +3,10 @@
 test_description='verbose commit template'
 . ./test-lib.sh
 
-cat >check-for-diff <<EOF
-#!$SHELL_PATH
-exec grep '^diff --git' "\$1"
+write_script "check-for-diff" <<\EOF &&
+grep '^diff --git' "$1" >out
+exit 0
 EOF
-chmod +x check-for-diff
 test_set_editor "$PWD/check-for-diff"
 
 cat >message <<'EOF'
@@ -23,7 +22,8 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'initial commit shows verbose diff' '
-       git commit --amend -v
+       git commit --amend -v &&
+       test_line_count = 1 out
 '
 
 test_expect_success 'second commit' '
@@ -39,13 +39,15 @@ check_message() {
 
 test_expect_success 'verbose diff is stripped out' '
        git commit --amend -v &&
-       check_message message
+       check_message message &&
+       test_line_count = 1 out
 '
 
 test_expect_success 'verbose diff is stripped out (mnemonicprefix)' '
        git config diff.mnemonicprefix true &&
        git commit --amend -v &&
-       check_message message
+       check_message message &&
+       test_line_count = 1 out
 '
 
 cat >diff <<'EOF'

--
https://github.com/git/git/pull/218
--
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