Bug 1478979 - Disallow pageLoadStrategy to be null. r=whimboo

Capabilities matching is now done in geckodriver and Marionette
receives the negotiated set of capabilities, so there is no need
to derive default values in case the value is null.

testing/marionette/capabilities.js

@@ -464,24 +464,17 @@ class Capabilities extends Map {
     for (let [k, v] of Object.entries(json)) {
       switch (k) {
         case "acceptInsecureCerts":
-          assert.boolean(v,
-              pprint`Expected ${k} to be a boolean, got ${v}`);
+          assert.boolean(v, pprint`Expected ${k} to be a boolean, got ${v}`);
           matched.set("acceptInsecureCerts", v);
           break;
 
         case "pageLoadStrategy":
-          if (v === null) {
-            matched.set("pageLoadStrategy", PageLoadStrategy.Normal);
-          } else {
-            assert.string(v,
-                pprint`Expected ${k} to be a string, got ${v}`);
+          assert.string(v, pprint`Expected ${k} to be a string, got ${v}`);
 
           if (Object.values(PageLoadStrategy).includes(v)) {
             matched.set("pageLoadStrategy", v);
           } else {
-              throw new InvalidArgumentError(
-                  "Unknown page load strategy: " + v);
-            }
+            throw new InvalidArgumentError("Unknown page load strategy: " + v);
           }
 
           break;
@@ -497,8 +490,7 @@ class Capabilities extends Map {
           break;
 
         case "unhandledPromptBehavior":
-          assert.string(v,
-              pprint`Expected ${k} to be a string, got ${v}`);
+          assert.string(v, pprint`Expected ${k} to be a string, got ${v}`);
 
           if (Object.values(UnhandledPromptBehavior).includes(v)) {
             matched.set("unhandledPromptBehavior", v);
@@ -510,20 +502,17 @@ class Capabilities extends Map {
           break;
 
         case "moz:accessibilityChecks":
-          assert.boolean(v,
-              pprint`Expected ${k} to be a boolean, got ${v}`);
+          assert.boolean(v, pprint`Expected ${k} to be a boolean, got ${v}`);
           matched.set("moz:accessibilityChecks", v);
           break;
 
         case "moz:useNonSpecCompliantPointerOrigin":
-          assert.boolean(v,
-              pprint`Expected ${k} to be a boolean, got ${v}`);
+          assert.boolean(v, pprint`Expected ${k} to be a boolean, got ${v}`);
           matched.set("moz:useNonSpecCompliantPointerOrigin", v);
           break;
 
         case "moz:webdriverClick":
-          assert.boolean(v,
-              pprint`Expected ${k} to be a boolean, got ${v}`);
+          assert.boolean(v, pprint`Expected ${k} to be a boolean, got ${v}`);
           matched.set("moz:webdriverClick", v);
           break;
       }

testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py

@@ -143,12 +143,7 @@ class TestCapabilityMatching(MarionetteTestCase):
             self.marionette.start_session({"pageLoadStrategy": strategy})
             self.assertEqual(self.marionette.session_capabilities["pageLoadStrategy"], strategy)
 
-        # A null value should be treatend as "normal"
-        self.delete_session()
-        self.marionette.start_session({"pageLoadStrategy": None})
-        self.assertEqual(self.marionette.session_capabilities["pageLoadStrategy"], "normal")
-
-        for value in ["", "EAGER", True, 42, {}, []]:
+        for value in ["", "EAGER", True, 42, {}, [], None]:
             print("invalid strategy {}".format(value))
             with self.assertRaisesRegexp(SessionNotCreatedException, "InvalidArgumentError"):
                 self.marionette.start_session({"pageLoadStrategy": value})

testing/marionette/test/unit/test_capabilities.js

@@ -456,6 +456,7 @@ add_test(function test_Capabilities_fromJSON() {
     equal(strategy, caps.get("pageLoadStrategy"));
   }
   Assert.throws(() => fromJSON({pageLoadStrategy: "foo"}), InvalidArgumentError);
+  Assert.throws(() => fromJSON({pageLoadStrategy: null}), InvalidArgumentError);
 
   let proxyConfig = {proxyType: "manual"};
   caps = fromJSON({proxy: proxyConfig});