Add deletePlaylist() call.

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

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

@@ -0,0 +1,34 @@
+package org.moire.ultrasonic.api.subsonic
+
+import org.junit.Test
+
+/**
+ * Instrumentation test for [SubsonicAPIClient] for deletePlaylist call.
+ */
+class SubsonicApiDeletePlaylistTest : SubsonicAPIClientTest() {
+    @Test
+    fun `Should handle error response`() {
+        checkErrorCallParsed(mockWebServerRule) {
+            client.api.deletePlaylist(10).execute()
+        }
+    }
+
+    @Test
+    fun `Should handle ok response`() {
+        mockWebServerRule.enqueueResponse("ping_ok.json")
+
+        val response = client.api.deletePlaylist(10).execute()
+
+        assertResponseSuccessful(response)
+    }
+
+    @Test
+    fun `Should pass id param in request`() {
+        val id = 534L
+
+        mockWebServerRule.assertRequestParam(responseResourceName = "ping_ok.json",
+                expectedParam = "id=$id") {
+            client.api.deletePlaylist(id).execute()
+        }
+    }
+}

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

@@ -96,4 +96,7 @@ interface SubsonicAPIDefinition {
     fun createPlaylist(@Query("playlistId") id: Long? = null,
                        @Query("name") name: String? = null,
                        @Query("songId") songIds: List<Long>? = null): Call<SubsonicResponse>
+
+    @GET("deletePlaylist.view")
+    fun deletePlaylist(@Query("id") id: Long): Call<SubsonicResponse>
 }