t3700: merge two tests into one

Depending on the underlying platform a chmod may be a noop. Although it
wouldn't harm the result of the '--chmod=-x' test, there is a more
robust way to make sure the --chmod option works both ways.

Merge the two separate tests for the --chmod option into one, checking
both permissions on the same file.

Signed-off-by: Ingo Brückl <ib@wupperonline.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ib

t/t3700-add.sh

@@ -332,24 +332,18 @@ test_expect_success 'git add --dry-run --ignore-missing of non-existing file out
 	test_i18ncmp expect.err actual.err
 '
 
-test_expect_success 'git add --chmod=+x stages a non-executable file with +x' '
+test_expect_success 'git add --chmod=[+-]x stages correctly' '
 	rm -f foo1 &&
 	echo foo >foo1 &&
 	git add --chmod=+x foo1 &&
 	case "$(git ls-files --stage foo1)" in
 	100755" "*foo1) echo pass;;
 	*) echo fail; git ls-files --stage foo1; (exit 1);;
-	esac
-'
-
-test_expect_success 'git add --chmod=-x stages an executable file with -x' '
-	rm -f xfoo1 &&
-	echo foo >xfoo1 &&
-	chmod 755 xfoo1 &&
-	git add --chmod=-x xfoo1 &&
-	case "$(git ls-files --stage xfoo1)" in
-	100644" "*xfoo1) echo pass;;
-	*) echo fail; git ls-files --stage xfoo1; (exit 1);;
+	esac &&
+	git add --chmod=-x foo1 &&
+	case "$(git ls-files --stage foo1)" in
+	100644" "*foo1) echo pass;;
+	*) echo fail; git ls-files --stage foo1; (exit 1);;
 	esac
 '