add tests for impresion count

Author: mredolatti

client/src/main/java/io/split/client/dtos/ImpressionCount.java

@@ -42,7 +42,7 @@ public static class CountPerFeature {
 
         private static final String FIELD_FEATURE = "f";
         private static final String FIELD_TIMEFRAME = "m";
-        private static final String FIELD_COUNT = "c";
+        private static final String FIELD_COUNT = "rc";
 
         @SerializedName(FIELD_FEATURE)
         public final String feature;

client/src/test/java/io/split/client/dtos/ImpressionCountTest.java

@@ -0,0 +1,37 @@
+package io.split.client.dtos;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.hamcrest.core.IsInstanceOf.instanceOf;
+
+public class ImpressionCountTest {
+
+    @Test
+    public void testImpressionCountSerialization() {
+        ImpressionCount ic = new ImpressionCount(Collections.singletonList(
+                new ImpressionCount.CountPerFeature("test1", 0, 23)));
+
+        Gson gson = new Gson();
+        String serialized = gson.toJson(ic);
+        HashMap<String, Object> parsedRaw = gson.fromJson(serialized, new TypeToken<HashMap<String, Object>>(){}.getType());
+        assertThat(parsedRaw.get("pf"), instanceOf(List.class));
+        List<Object> asList = (ArrayList) parsedRaw.get("pf");
+        assertThat(asList.size(), is(equalTo(1)));
+        Map<String, Object> item0 = (Map<String, Object>) asList.get(0);
+        assertThat(item0.get("f"), is(equalTo("test1")));
+        assertThat(item0.get("m"), is(equalTo(0.0)));
+        assertThat(item0.get("rc"), is(equalTo(23.0)));
+    }
+}