Prepare http-client test for Amazon

Makefile

@@ -135,6 +135,7 @@ test-http-client:
 		/workdir/get_soundtouch_updates.http \
 		/workdir/get_streaming_token.http \
 		/workdir/post_oauth_token.http \
+		/workdir/post_oauth_token_amazon.http \
 		/workdir/get_provider_settings.http \
 		/workdir/tunein_playback_station.http \
 		/workdir/set_preset_6.http \

tests/integration/http-client/http-client.env.json

@@ -17,6 +17,8 @@
     "spotifyToken": "example-spotify-token",
     "spotifyRefreshToken": "example-spotify-refresh-token",
     "spotifyDisplayName": "For Lovers, Not Killers",
+    "amazonProviderID": "20",
+    "amazonRefreshToken": "example-amazon-refresh-token",
     "bmxApiKey": "bmx-api-key",
     "qplayProviderID": "26"
   },
@@ -38,6 +40,8 @@
     "spotifyToken": "example-spotify-token",
     "spotifyRefreshToken": "example-spotify-refresh-token",
     "spotifyDisplayName": "For Lovers, Not Killers",
+    "amazonProviderID": "20",
+    "amazonRefreshToken": "example-amazon-refresh-token",
     "bmxApiKey": "bmx-api-key",
     "qplayProviderID": "26"
   }

tests/integration/http-client/post_oauth_token_amazon.http

@@ -0,0 +1,44 @@
+### POST /oauth/device/{{deviceId}}/music/musicprovider/20/token/cs1
+# Mirrors the exact request the SoundTouch firmware makes when it needs a fresh Amazon access token.
+# The speaker extracts the bare refresh_token from its stored AmazonSecret JSON and sends it here.
+# Log reference: STSOAuth2::ConstructPostDataString — grant_type=refresh_token, code and redirect_uri are always empty.
+POST {{host}}/oauth/device/{{deviceId}}/music/musicprovider/20/token/cs1
+Authorization: Bearer {{token}}
+Content-Type: application/json
+
+{
+  "code": "",
+  "grant_type": "refresh_token",
+  "redirect_uri": "",
+  "refresh_token": "{{amazonRefreshToken}}"
+}
+
+> {%
+    // TODO: upgrade to 200 + JSON structure assertions once the Amazon service is implemented
+    // and a mock Amazon OAuth server is wired into the CI docker-compose (mirroring spotify-mock).
+    client.test("Route is registered (stub returns 501, not 404)", function() {
+        client.assert(response.status === 501, "Expected 501 Not Implemented from stub, got " + response.status);
+    });
+
+    // client.test("Request executed successfully", function() {
+    //     client.assert(response.status === 200, "Response status is not 200");
+    // });
+
+    // client.test("Response content type is JSON", function() {
+    //     var type = response.contentType.mimeType;
+    //     client.assert(type === "application/json", "Expected 'application/json' but received '" + type + "'");
+    // });
+
+    // client.test("Response body has expected structure", function() {
+    //     client.assert(response.body.hasOwnProperty("access_token"), "Response body missing 'access_token'");
+    //     client.assert(response.body.access_token.length > 0, "access_token is empty");
+    //
+    //     client.assert(response.body.hasOwnProperty("expires_in"), "Response body missing 'expires_in'");
+    //     client.assert(typeof response.body.expires_in === "number", "expires_in is not a number");
+    //
+    //     client.assert(response.body.hasOwnProperty("token_type"), "Response body missing 'token_type'");
+    //     client.assert(response.body.token_type === "Bearer", "token_type is not 'Bearer'");
+    //
+    //     // Amazon omits 'scope' — do not assert its presence.
+    // });
+%}