ls-files: update test style

Update test style in t/t30[*].sh for uniformity, that's to
keep test title the same line with helper function itself,
and fix some indentions.

Add a new section "recommended style" in t/README to
encourage people to use more modern style in test.

Signed-off-by: Li Linchao <lilinchao@oschina.cn>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3002-ls-files-dashpath.sh

@@ -16,56 +16,62 @@ filesystem.
 TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
-test_expect_success \
-	setup \
-	'echo frotz >path0 &&
+test_expect_success 'setup' '
+	echo frotz >path0 &&
 	echo frotz >./-foo &&
-	echo frotz >./--'
-
-test_expect_success \
-    'git ls-files without path restriction.' \
-    'git ls-files --others >output &&
-     test_cmp output - <<EOF
---
--foo
-output
-path0
-EOF
+	echo frotz >./--
 '
 
-test_expect_success \
-    'git ls-files with path restriction.' \
-    'git ls-files --others path0 >output &&
-	test_cmp output - <<EOF
-path0
-EOF
+test_expect_success 'git ls-files without path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others >output &&
+	cat >expect <<-\EOF &&
+	--
+	-foo
+	output
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with path restriction with --.' \
-    'git ls-files --others -- path0 >output &&
-	test_cmp output - <<EOF
-path0
-EOF
+test_expect_success 'git ls-files with path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others path0 >output &&
+	cat >expect <<-\EOF &&
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with path restriction with -- --.' \
-    'git ls-files --others -- -- >output &&
-	test_cmp output - <<EOF
---
-EOF
+test_expect_success 'git ls-files with path restriction with --.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- path0 >output &&
+	cat >expect <<-\EOF &&
+	path0
+	EOF
+	test_cmp output expect
 '
 
-test_expect_success \
-    'git ls-files with no path restriction.' \
-    'git ls-files --others -- >output &&
-	test_cmp output - <<EOF
---
--foo
-output
-path0
-EOF
+test_expect_success 'git ls-files with path restriction with -- --.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- -- >output &&
+	cat >expect <<-\EOF &&
+	--
+	EOF
+	test_cmp output expect
+'
+
+test_expect_success 'git ls-files with no path restriction.' '
+	test_when_finished "rm -f expect" &&
+	git ls-files --others -- >output &&
+	cat >expect <<-\EOF &&
+	--
+	-foo
+	output
+	path0
+	EOF
+	test_cmp output expect
+
 '
 
 test_done