config: document current write behaviour in a test

On set, we set/add the value written to the config's internal values,
but we do not refresh old values.

Document this in a test in preparation for the refresh changes.

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/config/write.c b/tests/config/write.c
index 922d75557..f269c9571 100644
--- a/tests/config/write.c
+++ b/tests/config/write.c
@@ -304,3 +304,30 @@ void test_config_write__updating_a_locked_config_file_returns_ELOCKED(void)
 	git_config_free(cfg);
 }
 
+void test_config_write__outside_change(void)
+{
+	int32_t tmp;
+	git_config *cfg;
+	const char *filename = "config-ext-change";
+
+	cl_git_mkfile(filename, "[old]\nvalue = 5\n");
+
+	cl_git_pass(git_config_open_ondisk(&cfg, filename));
+
+	cl_git_pass(git_config_get_int32(&tmp, cfg, "old.value"));
+
+	/* Change the value on the file itself (simulate external process) */
+	cl_git_mkfile(filename, "[old]\nvalue = 6\n");
+
+	cl_git_pass(git_config_set_int32(cfg, "new.value", 7));
+
+	cl_git_pass(git_config_get_int32(&tmp, cfg, "old.value"));
+	cl_assert_equal_i(5, tmp);
+
+	cl_git_pass(git_config_refresh(cfg));
+
+	cl_git_pass(git_config_get_int32(&tmp, cfg, "old.value"));
+	cl_assert_equal_i(6, tmp);
+
+	git_config_free(cfg);
+}