Add addChatMessage() call.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiAddChatMessageTest.kt

@@ -0,0 +1,33 @@
+package org.moire.ultrasonic.api.subsonic
+
+import org.junit.Test
+
+/**
+ * Integration test for [SubsonicAPIDefinition.addChatMessage] call.
+ */
+class SubsonicApiAddChatMessageTest : SubsonicAPIClientTest() {
+    @Test
+    fun `Should handle error response`() {
+        checkErrorCallParsed(mockWebServerRule) {
+            client.api.addChatMessage("some").execute()
+        }
+    }
+
+    @Test
+    fun `Should handle ok response`() {
+        mockWebServerRule.enqueueResponse("ping_ok.json")
+
+        val response = client.api.addChatMessage("some").execute()
+
+        assertResponseSuccessful(response)
+    }
+
+    @Test
+    fun `Should pass message in request param`() {
+        val message = "Youuhuuu"
+
+        mockWebServerRule.assertRequestParam(expectedParam = "message=$message") {
+            client.api.addChatMessage(message = message).execute()
+        }
+    }
+}

subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicAPIDefinition.kt

@@ -217,4 +217,7 @@ interface SubsonicAPIDefinition {
 
     @GET("getChatMessages.view")
     fun getChatMessages(@Query("since") since: Long? = null): Call<ChatMessagesResponse>
+
+    @GET("addChatMessage.view")
+    fun addChatMessage(@Query("message") message: String): Call<SubsonicResponse>
 }