Bug 1174941: Remove all capabilities from desired capabilities if they are in the session capabilitiesand in requiredCapabilities; r=ato

--HG--
extra : commitid : 49h1HhlE4h
extra : rebase_source : fd01b68b9b34414fa5fd84e7fb592d0c22a1e60f

testing/marionette/client/marionette/tests/unit/test_capabilities.py

@@ -57,6 +57,14 @@ class TestCapabilities(MarionetteTestCase):
         caps = self.marionette.session_capabilities
         self.assertIn("somethingAwesome", caps)
 
+    def test_we_dont_overwrite_server_capabilities(self):
+        self.marionette.delete_session()
+        capabilities = { "desiredCapabilities": {"browserName": "ChocolateCake"}}
+        self.marionette.start_session(capabilities)
+        caps = self.marionette.session_capabilities
+        self.assertEqual(caps["browserName"], self.appinfo["name"],
+                         "This should have appname not ChocolateCake")
+
     def test_we_can_pass_in_required_capabilities_on_session_start(self):
         self.marionette.delete_session()
         capabilities = { "requiredCapabilities": {"browserName": self.appinfo["name"]}}

testing/marionette/driver.js

@@ -602,18 +602,33 @@ GeckoDriver.prototype.getSessionCapabilities = function(cmd, resp) {
  */
 GeckoDriver.prototype.setSessionCapabilities = function(newCaps) {
   const copy = (from, to={}) => {
-    let errors = {};
+    let errors = [];
+
+    // Remove any duplicates between required and desired in favour of the
+    // required capabilities
+    if (from !== null && from.desiredCapabilities) {
+      for (let cap in from.requiredCapabilities) {
+        if (from.desiredCapabilities[cap]) {
+          delete from.desiredCapabilities[cap];
+        }
+      }
+
+      // Let's remove the sessionCapabilities from desired capabilities
+      for (let cap in this.sessionCapabilities) {
+        if (from.desiredCapabilities && from.desiredCapabilities[cap]) {
+          delete from.desiredCapabilities[cap];
+        }
+      }
+    }
 
     for (let key in from) {
       if (key === "desiredCapabilities") {
-        // Keeping desired capabilities separate for now so that we can keep
-        // backwards compatibility
         to = copy(from[key], to);
       } else if (key === "requiredCapabilities") {
         for (let caps in from[key]) {
           if (from[key][caps] !== this.sessionCapabilities[caps]) {
-            errors[caps] = from[key][caps] + " does not equal " +
+            errors.push(from[key][caps] + " does not equal " +
-                this.sessionCapabilities[caps];
+                this.sessionCapabilities[caps])   ;
           }
         }
       }