perf: add a comparison test of log --grep regex engines

diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index c84c4d99f90aa9822c6cd65549d5eb7f907f2c95..561709ef6aa1b8394317b3a9e722f5bddc391498 100755 (executable)
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -281,6 +281,10 @@ do
                test_cmp expected actual
        '
 
+       test_expect_success !PCRE "grep $L with grep.patterntype=perl errors without PCRE" '
+               test_must_fail git -c grep.patterntype=perl grep "foo.*bar"
+       '
+
        test_expect_success "grep $L with grep.patternType=default and grep.extendedRegexp=true" '
                echo "${HC}ab:abc" >expected &&
                git \
@@ -771,6 +775,22 @@ test_expect_success 'grep -W with userdiff' '
        test_cmp expected actual
 '
 
+for threads in $(test_seq 0 10)
+do
+       test_expect_success "grep --threads=$threads & -c grep.threads=$threads" "
+               git grep --threads=$threads . >actual.$threads &&
+               if test $threads -ge 1
+               then
+                       test_cmp actual.\$(($threads - 1)) actual.$threads
+               fi &&
+               git -c grep.threads=$threads grep . >actual.$threads &&
+               if test $threads -ge 1
+               then
+                       test_cmp actual.\$(($threads - 1)) actual.$threads
+               fi
+       "
+done
+
 test_expect_success 'grep from a subdirectory to search wider area (1)' '
        mkdir -p s &&
        (
@@ -1058,11 +1078,19 @@ test_expect_success PCRE 'grep --perl-regexp pattern' '
        test_cmp expected actual
 '
 
+test_expect_success !PCRE 'grep --perl-regexp pattern errors without PCRE' '
+       test_must_fail git grep --perl-regexp "foo.*bar"
+'
+
 test_expect_success PCRE 'grep -P pattern' '
        git grep -P "\p{Ps}.*?\p{Pe}" hello.c >actual &&
        test_cmp expected actual
 '
 
+test_expect_success !PCRE 'grep -P pattern errors without PCRE' '
+       test_must_fail git grep -P "foo.*bar"
+'
+
 test_expect_success 'grep pattern with grep.extendedRegexp=true' '
        >empty &&
        test_must_fail git -c grep.extendedregexp=true \
@@ -1102,6 +1130,13 @@ test_expect_success PCRE 'grep -P -w pattern' '
        test_cmp expected actual
 '
 
+test_expect_success PCRE 'grep -P backreferences work (the PCRE NO_AUTO_CAPTURE flag is not set)' '
+       git grep -P -h "(?P<one>.)(?P=one)" hello_world >actual &&
+       test_cmp hello_world actual &&
+       git grep -P -h "(.)\1" hello_world >actual &&
+       test_cmp hello_world actual
+'
+
 test_expect_success 'grep -G invalidpattern properly dies ' '
        test_must_fail git grep -G "a["
 '