t: add tests for .gitlocalignore

Exercise the new discoverable, local-only ignore file:

gating via core.gitLocalIgnore, self-exclusion, precedence relative

to info/exclude and core.excludesFile, root-only scoping, and that

ignored files stay out of git status and cannot be added without -f.

Signed-off-by: Shanthosh <shanthubolt@gmail.com>

Author: Msalways

t/t0011-gitlocalignore.sh

@@ -0,0 +1,73 @@
+#!/bin/sh
+
+test_description='.gitlocalignore support (core.gitLocalIgnore)'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# off by default: .gitlocalignore is not consulted at all
+test_expect_success 'off by default: .gitlocalignore is ignored' '
+	echo content >a.txt &&
+	printf "a.txt\n" >.gitlocalignore &&
+	test_must_fail git check-ignore a.txt
+'
+
+test_expect_success 'core.gitLocalIgnore enables .gitlocalignore' '
+	test_config core.gitLocalIgnore true &&
+	echo content >b.txt &&
+	printf "b.txt\n" >.gitlocalignore &&
+	git check-ignore b.txt
+'
+
+test_expect_success '.gitlocalignore is self-excluding' '
+	test_config core.gitLocalIgnore true &&
+	printf "b.txt\n" >.gitlocalignore &&
+	git check-ignore .gitlocalignore
+'
+
+test_expect_success 'info/exclude outranks .gitlocalignore' '
+	test_config core.gitLocalIgnore true &&
+	mkdir -p .git/info &&
+	echo "c.txt" >.git/info/exclude &&
+	echo content >c.txt &&
+	printf "c.txt\n" >.gitlocalignore &&
+	git check-ignore -v c.txt >out &&
+	grep "info/exclude" out
+'
+
+test_expect_success '.gitlocalignore outranks core.excludesFile' '
+	test_config core.gitLocalIgnore true &&
+	echo content >d.txt &&
+	printf "d.txt\n" >.gitlocalignore &&
+	echo "d.txt" >.git/excludes-extra &&
+	test_config core.excludesFile "$(pwd)/.git/excludes-extra" &&
+	git check-ignore -v d.txt >out &&
+	grep "\.gitlocalignore" out
+'
+
+test_expect_success 'nested .gitlocalignore contents are not read' '
+	test_config core.gitLocalIgnore true &&
+	rm -f .gitlocalignore &&
+	mkdir -p sub &&
+	echo content >sub/e.txt &&
+	printf "e.txt\n" >sub/.gitlocalignore &&
+	test_must_fail git check-ignore sub/e.txt
+'
+
+test_expect_success 'ignored files stay out of git status' '
+	test_config core.gitLocalIgnore true &&
+	echo content >f.txt &&
+	printf "f.txt\n" >.gitlocalignore &&
+	git status --porcelain >out &&
+	! grep f.txt out
+'
+
+test_expect_success 'git add refuses .gitlocalignore unless forced' '
+	test_config core.gitLocalIgnore true &&
+	printf "f.txt\n" >.gitlocalignore &&
+	test_must_fail git add .gitlocalignore &&
+	git add -f .gitlocalignore &&
+	git ls-files --error-unmatch .gitlocalignore
+'
+
+test_done