Fix coverage

Author: manuel-alvarez-alvarez

products/feature-flagging/lib/src/main/java/com/datadog/featureflag/RemoteConfigServiceImpl.java

@@ -16,7 +16,6 @@
 import datadog.trace.api.featureflag.ufc.v1.ServerConfiguration;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.UnsupportedEncodingException;
 import java.time.Instant;
 import java.time.ZoneOffset;
 import java.time.format.DateTimeFormatter;
@@ -100,7 +99,7 @@ public Date fromJson(@Nonnull final JsonReader reader) throws IOException {
     @Override
     public void toJson(@Nonnull final JsonWriter writer, @Nullable final Date value)
         throws IOException {
-      throw new UnsupportedEncodingException("Reading only adapter");
+      throw new UnsupportedOperationException("Reading only adapter");
     }
   }
 }

products/feature-flagging/lib/src/test/groovy/com/datadog/featureflag/RemoteConfigServiceTest.groovy

@@ -1,6 +1,7 @@
 package com.datadog.featureflag
 
 import com.squareup.moshi.JsonReader
+import com.squareup.moshi.JsonWriter
 import datadog.communication.ddagent.SharedCommunicationObjects
 import datadog.remoteconfig.Capabilities
 import datadog.remoteconfig.ConfigurationDeserializer
@@ -105,4 +106,15 @@ class RemoteConfigServiceTest extends DDSpecification {
     // Null input
     null                        | null
   }
+
+  void 'test parsing only adapter'() {
+    given:
+    final adapter = new RemoteConfigServiceImpl.DateAdapter()
+
+    when:
+    adapter.toJson(Stub(JsonWriter), new Date())
+
+    then:
+    thrown(UnsupportedOperationException)
+  }
 }