git-grep: Fix problems with recently added tests

Brian Gernhardt reported that test 'git grep -E -F -G a\\+b' fails on
OS X 10.6.7. This is because I assumed \+ is part of BRE, which isn't
true on all platforms.

The easiest way to make this test pass is to just update expected
output, but that would make the test pointless. Its real purpose is to
check whether 'git grep -E -F -G' is different from 'git grep -E -G -F'.
To check that, let's change pattern to "a+b*c". This should return
different match for -G, -F and -E.

I also made two small tweaks to the tests. First, I added path "ab" to
all calls to future-proof tests. Second, I updated last two tests to
better show that 'git grep -P -E' is different from 'git grep -E -P'.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7810-grep.sh

@@ -33,9 +33,9 @@ test_expect_success setup '
 		echo HeLLo_world
 	} >hello_world &&
 	{
-		echo aab
-		echo a+b
-		echo a\\+b
+		echo "a+b*c"
+		echo "a+bc"
+		echo "abc"
 	} >ab &&
 	echo vvv >v &&
 	echo ww w >w &&
@@ -233,14 +233,14 @@ do
 		test_cmp expected actual
 	'
 	test_expect_success "grep $L with grep.extendedRegexp=false" '
-		echo "ab:a+b" >expected &&
-		git -c grep.extendedRegexp=false grep "a+b" >actual &&
+		echo "ab:a+bc" >expected &&
+		git -c grep.extendedRegexp=false grep "a+b*c" ab >actual &&
 		test_cmp expected actual
 	'
 
 	test_expect_success "grep $L with grep.extendedRegexp=true" '
-		echo "ab:aab" >expected &&
-		git -c grep.extendedRegexp=true grep "a+b" >actual &&
+		echo "ab:abc" >expected &&
+		git -c grep.extendedRegexp=true grep "a+b*c" ab >actual &&
 		test_cmp expected actual
 	'
 done
@@ -636,7 +636,7 @@ test_expect_success LIBPCRE 'grep -P pattern' '
 '
 
 test_expect_success 'grep pattern with grep.extendedRegexp=true' '
-	:>empty &&
+	>empty &&
 	test_must_fail git -c grep.extendedregexp=true \
 		grep "\p{Ps}.*?\p{Pe}" hello.c >actual &&
 	test_cmp empty actual
@@ -650,10 +650,10 @@ test_expect_success LIBPCRE 'grep -P pattern with grep.extendedRegexp=true' '
 
 test_expect_success LIBPCRE 'grep -P -v pattern' '
 	{
-		echo ab:a+b
-		echo ab:a\\+b
+		echo "ab:a+b*c"
+		echo "ab:a+bc"
 	} >expected &&
-	git grep -P -v "aab" ab >actual &&
+	git grep -P -v "abc" ab >actual &&
 	test_cmp expected actual
 '
 
@@ -686,39 +686,33 @@ test_expect_success LIBPCRE 'grep -P invalidpattern properly dies ' '
 	test_must_fail git grep -P "a["
 '
 
-test_expect_success 'grep -F -E -G pattern' '
-	echo ab:a+b >expected &&
-	git grep -F -E -G a+b >actual &&
-	test_cmp expected actual
-'
-
-test_expect_success 'grep -F -G -E pattern' '
-	echo ab:aab >expected &&
-	git grep -F -G -E a+b >actual &&
+test_expect_success 'grep -G -E -F pattern' '
+	echo "ab:a+b*c" >expected &&
+	git grep -G -E -F "a+b*c" ab >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'grep -E -F -G pattern' '
-	echo ab:aab >expected &&
-	git grep -E -F -G a\\+b >actual &&
+	echo "ab:a+bc" >expected &&
+	git grep -E -F -G "a+b*c" ab >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'grep -E -G -F pattern' '
-	echo ab:a\\+b >expected &&
-	git grep -E -G -F a\\+b >actual &&
+test_expect_success 'grep -F -G -E pattern' '
+	echo "ab:abc" >expected &&
+	git grep -F -G -E "a+b*c" ab >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'grep -G -F -E pattern' '
-	echo ab:a+b >expected &&
-	git grep -G -F -E a\\+b >actual &&
-	test_cmp expected actual
+test_expect_success 'grep -G -F -P -E pattern' '
+	>empty &&
+	test_must_fail git grep -G -F -P -E "a\x{2b}b\x{2a}c" ab >actual &&
+	test_cmp empty actual
 '
 
-test_expect_success LIBPCRE 'grep -E -G -F -P pattern' '
-	echo ab:a+b >expected &&
-	git grep -E -G -F -P a\\+b >actual &&
+test_expect_success LIBPCRE 'grep -G -F -E -P pattern' '
+	echo "ab:a+b*c" >expected &&
+	git grep -G -F -E -P "a\x{2b}b\x{2a}c" ab >actual &&
 	test_cmp expected actual
 '