Add unit test to test add section without lf at EOF

tests/config/write.c

@@ -229,6 +229,22 @@ void test_config_write__add_value_at_file_with_no_clrf_at_the_end(void)
 	git_config_free(cfg);
 }
 
+void test_config_write__add_section_at_file_with_no_clrf_at_the_end(void)
+{
+	git_config *cfg;
+	int i;
+
+	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
+	cl_git_pass(git_config_set_int32(cfg, "diff.context", 10));
+	git_config_free(cfg);
+
+	cl_git_pass(git_config_open_ondisk(&cfg, "config17"));
+	cl_git_pass(git_config_get_int32(&i, cfg, "diff.context"));
+	cl_assert_equal_i(10, i);
+
+	git_config_free(cfg);
+}
+
 void test_config_write__add_value_which_needs_quotes(void)
 {
 	git_config *cfg;