t4209: set up expectations up front

Instead of creating an expect file for each test, build three files with
the possible valid values during setup and use them in the tests.  This
shortens the test code and saves nine calls to git rev-parse.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4209-log-pickaxe.sh

@@ -4,80 +4,74 @@ test_description='log --grep/--author/--regexp-ignore-case/-S/-G'
 . ./test-lib.sh
 
 test_expect_success setup '
+	>expect_nomatch &&
+
 	>file &&
 	git add file &&
 	test_tick &&
 	git commit -m initial &&
+	git rev-parse --verify HEAD >expect_initial &&
 
 	echo Picked >file &&
+	git add file &&
 	test_tick &&
-	git commit -a --author="Another Person <another@example.com>" -m second
+	git commit --author="Another Person <another@example.com>" -m second &&
+	git rev-parse --verify HEAD >expect_second
 '
 
 test_expect_success 'log --grep' '
 	git log --grep=initial --format=%H >actual &&
-	git rev-parse --verify HEAD^ >expect &&
-	test_cmp expect actual
+	test_cmp expect_initial actual
 '
 
 test_expect_success 'log --grep --regexp-ignore-case' '
 	git log --regexp-ignore-case --grep=InItial --format=%H >actual &&
-	git rev-parse --verify HEAD^ >expect &&
-	test_cmp expect actual
+	test_cmp expect_initial actual
 '
 
 test_expect_success 'log --grep -i' '
 	git log -i --grep=InItial --format=%H >actual &&
-	git rev-parse --verify HEAD^ >expect &&
-	test_cmp expect actual
+	test_cmp expect_initial actual
 '
 
 test_expect_success 'log --author --regexp-ignore-case' '
 	git log --regexp-ignore-case --author=person --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log --author -i' '
 	git log -i --author=person --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -G (nomatch)' '
 	git log -Gpicked --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -G (match)' '
 	git log -GPicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -G --regexp-ignore-case (nomatch)' '
 	git log --regexp-ignore-case -Gpickle --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -G -i (nomatch)' '
 	git log -i -Gpickle --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -G --regexp-ignore-case (match)' '
 	git log --regexp-ignore-case -Gpicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -G -i (match)' '
 	git log -i -Gpicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -G --textconv (missing textconv tool)' '
@@ -89,45 +83,38 @@ test_expect_success 'log -G --textconv (missing textconv tool)' '
 test_expect_success 'log -G --no-textconv (missing textconv tool)' '
 	echo "* diff=test" >.gitattributes &&
 	git -c diff.test.textconv=missing log -Gfoo --no-textconv >actual &&
-	>expect &&
-	test_cmp expect actual &&
+	test_cmp expect_nomatch actual &&
 	rm .gitattributes
 '
 
 test_expect_success 'log -S (nomatch)' '
 	git log -Spicked --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -S (match)' '
 	git log -SPicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -S --regexp-ignore-case (match)' '
 	git log --regexp-ignore-case -Spicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -S -i (match)' '
 	git log -i -Spicked --format=%H >actual &&
-	git rev-parse --verify HEAD >expect &&
-	test_cmp expect actual
+	test_cmp expect_second actual
 '
 
 test_expect_success 'log -S --regexp-ignore-case (nomatch)' '
 	git log --regexp-ignore-case -Spickle --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -S -i (nomatch)' '
 	git log -i -Spickle --format=%H >actual &&
-	>expect &&
-	test_cmp expect actual
+	test_cmp expect_nomatch actual
 '
 
 test_expect_success 'log -S --textconv (missing textconv tool)' '
@@ -139,8 +126,7 @@ test_expect_success 'log -S --textconv (missing textconv tool)' '
 test_expect_success 'log -S --no-textconv (missing textconv tool)' '
 	echo "* diff=test" >.gitattributes &&
 	git -c diff.test.textconv=missing log -Sfoo --no-textconv >actual &&
-	>expect &&
-	test_cmp expect actual &&
+	test_cmp expect_nomatch actual &&
 	rm .gitattributes
 '