can enable delta in fse active outputv4.5.6

1 files changed, 27 insertions, 0 deletions

diff --git a/test/test_easy_fs.cpp b/test/test_easy_fs.cpp
index 44dbed9..0595593 100644
--- a/test/test_easy_fs.cpp
+++ b/test/test_easy_fs.cpp
@@ -40,6 +40,33 @@ TEST(test_easy_fieldstat, output_to_buff)
     fieldstat_easy_free(fse);
 }
 
+TEST(test_easy_fieldstat, output_to_buff_with_delta)
+{
+    struct fieldstat_easy *fse = fieldstat_easy_new(10, NULL, &TEST_TAG_STRING, 1);
+    fieldstat_easy_enable_delta_in_active_output(fse);
+    fieldstat_easy_register_counter(fse, "metric counter");
+    fieldstat_easy_counter_incrby(fse, 0, 0, &TEST_TAG_INT, 1, 1);
+    char *buff = NULL;
+    size_t buff_len = 0;
+    fieldstat_easy_output(fse, &buff, &buff_len);
+    free(buff);
+    fieldstat_easy_counter_incrby(fse, 0, 0, &TEST_TAG_INT, 1, 1);
+    fieldstat_easy_output(fse, &buff, &buff_len);
+
+    cJSON *root = cJSON_Parse(buff);
+    cJSON *cell = cJSON_GetArrayItem(root, 0);
+    cJSON *metric = cJSON_GetObjectItem(cell, "fields");
+    long long value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
+    EXPECT_EQ(value, 2);
+    cJSON *metric_delta = cJSON_GetObjectItem(cell, "fields_delta");
+    long long value_delta = cJSON_GetObjectItem(metric_delta, "metric counter")->valueint;
+    EXPECT_EQ(value_delta, 1);
+
+    cJSON_Delete(root);
+    free(buff);
+    fieldstat_easy_free(fse);
+}
+
 cJSON *read_file()
 {
     std::ifstream ifs(FILENAME);