test more permutations

test/runner.html

@@ -101,26 +101,26 @@
     // test shadowdom/custom elements polyfills together
     // preferring both if possible.
     var matrix = [''];
-    var webcomponents = '';
     if (window.customElements) {
-      webcomponents = 'wc-ce=true';
+      matrix.push('wc-ce=true');
     }
     // if native is available, make sure to test polyfill
     if (Element.prototype.attachShadow && Node.prototype.getRootNode) {
-      webcomponents = addUrlOption(webcomponents, 'wc-shadydom=true');
+      matrix.push('wc-shadydom=true');
     }
-    // ce + sd becomes a single test iteration.
-    if (webcomponents) {
-      matrix.push(webcomponents);
+    // Both sd and ce are supported, force both polyfills
+    if (matrix.length === 3) {
+      // ce + sd becomes a single test iteration.
+      matrix.push('wc-ce=true&wc-shadydom=true');
     }
+
     // economize testing by testing css shimming
     // only against 1 environment (native or polyfill).
     if (window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)')) {
-      var last = matrix[matrix.length-1];
+      var last = matrix.length === 1 ? '' : matrix[matrix.length - 1];
       matrix.push(addUrlOption(last, 'wc-shimcssproperties=true'));
     }
     suites = combinations(suites, [matrix]);
-
     console.log('Testing suites:\n\t' + suites.join('\n\t'));
 
     WCT.loadSuites(suites);