t3001, t7300: add testcase showcasing missed directory traversal

In the last commit, we added a testcase showing that the directory
traversal machinery sometimes traverses into directories unnecessarily.
Here we show that there are cases where it does the opposite: it does
not traverse into directories, despite those directories having
important files that need to be flagged.

Add a testcase showing that `git ls-files -o -i --directory` can omit
some of the files it should be listing, and another showing that `git
clean -fX` can fail to clean out some of the expected files.

Signed-off-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: newren

t/t3001-ls-files-others-exclude.sh

@@ -292,6 +292,11 @@ EOF
 	test_cmp expect actual
 '
 
+test_expect_failure 'ls-files with "**" patterns and --directory' '
+	# Expectation same as previous test
+	git ls-files --directory -o -i --exclude "**/a.1" >actual &&
+	test_cmp expect actual
+'
 
 test_expect_success 'ls-files with "**" patterns and no slashes' '
 	git ls-files -o -i --exclude "one**a.1" >actual &&

t/t7300-clean.sh

@@ -769,4 +769,23 @@ test_expect_failure 'avoid traversing into ignored directories' '
 	test_cmp trace.expect trace.relevant
 '
 
+test_expect_failure 'traverse into directories that may have ignored entries' '
+	test_when_finished rm -f output &&
+	test_create_repo need-to-traverse-into-hierarchy &&
+	(
+		cd need-to-traverse-into-hierarchy &&
+		mkdir -p modules/foobar/src/generated &&
+		> modules/foobar/src/generated/code.c &&
+		> modules/foobar/Makefile &&
+		echo "/modules/**/src/generated/" >.gitignore &&
+
+		git clean -fX modules/foobar >../output &&
+
+		grep Removing ../output &&
+
+		test_path_is_missing modules/foobar/src/generated/code.c &&
+		test_path_is_file modules/foobar/Makefile
+	)
+'
+
 test_done