[PATCH v6 3/7] grep tests: add missing "grep.patternType" config tests

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Extend the grep tests to assert that setting
"grep.patternType=extended" followed by "grep.patternType=default"
will behave as if "--basic-regexp" was provided, and not as
"--extended-regexp". In a subsequent commit we'll need to treat
"grep.patternType=default" as a special-case, but let's make sure we
ignore it if it's being set to "default" following an earlier
non-"default" "grep.patternType" setting.

Let's also test what happens when we have a sequence of "extended"
followed by "default" and "fixed". In that case the "fixed" should
prevail, as well as tests to check that a "grep.extendedRegexp=true"
followed by a "grep.extendedRegexp=false" behaves as though
"grep.extendedRegexp" wasn't provided.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 t/t7810-grep.sh | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 6b6423a07c3..664f884e12a 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -451,6 +451,45 @@ do
 		test_cmp expected actual
 	'
 
+	test_expect_success "grep $L with grep.extendedRegexp is last-one-wins" '
+		echo "${HC}ab:a+bc" >expected &&
+		git \
+			-c grep.extendedRegexp=true \
+			-c grep.patternType=basic \
+			-c grep.extendedRegexp=false \
+			grep "a+b*c" $H ab >actual &&
+		test_cmp expected actual
+	'
+
+	test_expect_success "grep $L with grep.extendedRegexp is last-one-wins & defers to grep.patternType" '
+		echo "${HC}ab:abc" >expected &&
+		git \
+			-c grep.extendedRegexp=true \
+			-c grep.patternType=extended \
+			-c grep.extendedRegexp=false \
+			grep "a+b*c" $H ab >actual &&
+		test_cmp expected actual
+	'
+
+	test_expect_success "grep $L with grep.patternType=extended and grep.patternType=default" '
+		echo "${HC}ab:a+bc" >expected &&
+		git \
+			-c grep.patternType=extended \
+			-c grep.patternType=default \
+			grep "a+b*c" $H ab >actual &&
+		test_cmp expected actual
+	'
+
+	test_expect_success "grep $L with grep.patternType=[extended -> default -> fixed]" '
+		echo "${HC}ab:a+b*c" >expected &&
+		git \
+			-c grep.patternType=extended \
+			-c grep.patternType=default \
+			-c grep.patternType=fixed \
+			grep "a+b*c" $H ab >actual &&
+		test_cmp expected actual
+	'
+
 	test_expect_success "grep $L with grep.patternType=extended and grep.extendedRegexp=false" '
 		echo "${HC}ab:abc" >expected &&
 		git \
-- 
2.34.1.1239.g84ae229c870




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