make test V=1 (or any other value than 0) and make test V=0
works similar way as build in general
test-binaries: $(TEST_BINARIES)
test: all test-binaries
+ifeq ($V,)
+ @echo 'Use "$(MAKE) V=1" to print test headings and PASSIng results.'
+ @env NOTMUCH_TEST_QUIET=1 ${test_src_dir}/notmuch-test $(OPTIONS)
+else
+# The user has explicitly enabled quiet execution.
+ifeq ($V,0)
+ @env NOTMUCH_TEST_QUIET=1 ${test_src_dir}/notmuch-test $(OPTIONS)
+else
@${test_src_dir}/notmuch-test $(OPTIONS)
+endif
+endif
check: test