tests: add ApiService tests

src/test/java/bugs/stackoverflow/belisarius/services/ApiServiceTest.java

@@ -0,0 +1,56 @@
+package bugs.stackoverflow.belisarius.services;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+public class ApiServiceTest {
+    private final ApiService apiService = new ApiService("stackoverflow");
+
+    @Test
+    public void quotaTest() {
+        apiService.setQuota(9483);
+        assertEquals(ApiService.getQuota(), 9483);
+
+        apiService.setQuota(9480);
+        apiService.setQuota(9479);
+        assertEquals(ApiService.getQuota(), 9479);
+    }
+
+    @Test
+    public void backoffTest() {
+        JsonObject sample1 = JsonParser
+            .parseString("{\"items\": [],\"quota_remaining\": 9789,\"backoff\": 10}")
+            .getAsJsonObject();
+
+        apiService.setBackOffUntil(sample1);
+        assertEquals(ApiService.getBackoffField(), 10);
+
+        JsonObject sample2 = JsonParser
+            .parseString("{\"items\": [],\"quota_remaining\": 9789}")
+            .getAsJsonObject();
+        apiService.setBackOffUntil(sample2);
+        assertEquals(ApiService.getBackoffField(), 0);
+    }
+
+    @Test
+    public void apiMethodsTest() throws IOException {
+        apiService.getPostIdsByActivityDesc(1, 1);
+        assertTrue(ApiService.getQuota() > 0);
+
+        apiService.getLatestRevisions("4;78751187", 1);
+
+        JsonObject response = apiService.getMorePostInformation("4");
+        JsonObject item = response
+            .get("items").getAsJsonArray()
+            .get(0).getAsJsonObject();
+
+        assertEquals(item.get("post_id").getAsInt(), 4);
+    }
+}