Makefile: detect missing Meson tests

In the preceding commit, we have introduced consistency checks to Meson
to detect any discrepancies with missing or extraneous tests in its
build instructions. These checks only get executed in Meson though, so
any users of our Makefiles wouldn't be alerted of the fact that they
have to modify the Meson build instructions in case they add or remove
any tests.

Add a comparable test target to our Makefile to plug this gap.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

t/Makefile

@@ -59,7 +59,7 @@ CHAINLINTSUPPRESS = GIT_TEST_EXT_CHAIN_LINT=0 && export GIT_TEST_EXT_CHAIN_LINT
 
 all:: $(DEFAULT_TEST_TARGET)
 
-test: pre-clean check-chainlint $(TEST_LINT)
+test: pre-clean check-chainlint check-meson $(TEST_LINT)
 	$(CHAINLINTSUPPRESS) $(MAKE) aggregate-results-and-cleanup
 
 failed:
@@ -114,6 +114,22 @@ check-chainlint:
 	{ $(CHAINLINT) --emit-all '$(CHAINLINTTMP_SQ)'/tests >'$(CHAINLINTTMP_SQ)'/actual || true; } && \
 	diff -u '$(CHAINLINTTMP_SQ)'/expect '$(CHAINLINTTMP_SQ)'/actual
 
+check-meson:
+	@# awk acts up when trying to match single quotes, so we use \047 instead.
+	@printf "%s\n" \
+		"integration_tests t[0-9][0-9][0-9][0-9]-*.sh" \
+		"unit_test_programs unit-tests/t-*.c" \
+		"clar_test_suites unit-tests/u-*.c" | \
+	while read -r variable pattern; do \
+		meson_tests=$$(awk "/^$$variable = \[\$$/ {flag=1 ; next } /^]$$/ { flag=0 } flag { gsub(/^  \047/, \"\"); gsub(/\047,\$$/, \"\"); print }" meson.build) && \
+		actual_tests=$$(ls $$pattern) && \
+		if test "$$meson_tests" != "$$actual_tests"; then \
+			echo "Meson tests differ from actual tests:"; \
+			diff -u <(echo "$$meson_tests") <(echo "$$actual_tests"); \
+			exit 1; \
+		fi; \
+	done
+
 test-lint: test-lint-duplicates test-lint-executable test-lint-shell-syntax \
 	test-lint-filenames
 ifneq ($(GIT_TEST_CHAIN_LINT),0)