Issue 6391 - Allow running the browser unit tests with Firefox

test_runner.js

Index: test_runner.js
===================================================================
--- a/test_runner.js
+++ b/test_runner.js
@@ -21,21 +21,44 @@
 
 const fs = require("fs");
 const path = require("path");
 
 const MemoryFS = require("memory-fs");
 const nodeunit = require("nodeunit");
 const webpack = require("webpack");
 
-const chromiumProcess = require("./chromium_process");
+const chromiumRemoteProcess = require("./test/runners/chromium_remote_process");
+const chromiumProcess = require("./test/runners/chromium_process");
+const firefoxProcess = require("./test/runners/firefox_process");
 
 let unitFiles = [];
 let browserFiles = [];
 
+let runnerDefinitions = {
+  // Chromium with chrome-remote-interface
+  chromium_remote: chromiumRemoteProcess,
+  // Chromium with WebDriver (requires Chromium >= 63.0.3239)
+  chromium: chromiumProcess,
+  firefox: firefoxProcess
+};
+
+function configureRunners()
+{
+  let runners = "BROWSER_TEST_RUNNERS" in process.env ?
+      process.env.BROWSER_TEST_RUNNERS.split(",") : [];
+
+  if (runners.length == 0)
+    return ["chromium", "firefox"];
+
+  return runners.filter(runner => runnerDefinitions.hasOwnProperty(runner));
+}
+
+let runnerProcesses = configureRunners();
+
 function addTestPaths(testPaths, recurse)
 {
   for (let testPath of testPaths)
   {
     let stat = fs.statSync(testPath);
     if (stat.isDirectory())
     {
       if (recurse)
@@ -88,17 +111,17 @@
         let bundle = memoryFS.readFileSync("/" + bundleFilename, "utf-8");
         memoryFS.unlinkSync("/" + bundleFilename);
         resolve(bundle);
       }
     });
   });
 }
 
-function runBrowserTests()
+function runBrowserTests(processes)
 {
   if (!browserFiles.length)
     return;
 
   let nodeunitPath = path.join(__dirname, "node_modules", "nodeunit",
                                "examples", "browser", "nodeunit.js");
   let bundleFilename = "bundle.js";
 
@@ -117,38 +140,41 @@
     },
     resolve: {
       alias: {
         nodeunit$: nodeunitPath
       },
       modules: [path.resolve(__dirname, "lib")]
     }
   }).then(bundle =>
-  {
-    return chromiumProcess(
-      bundle, bundleFilename,
-      browserFiles.map(
-        file => path.relative(path.join(__dirname, "test", "browser"),
-                              file).replace(/\.js$/, "")
+    Promise.all(
+      processes.map(currentProcess =>
+        runnerDefinitions[currentProcess](
+          bundle, bundleFilename,
+          browserFiles.map(
+            file => path.relative(path.join(__dirname, "test", "browser"),
+                                  file).replace(/\.js$/, "")
+          )
+        )
       )
-    );
-  });
+    )
+  );
 }
 
 if (process.argv.length > 2)
   addTestPaths(process.argv.slice(2), true);
 else
 {
   addTestPaths(
     [path.join(__dirname, "test"), path.join(__dirname, "test", "browser")],
     true
   );
 }
 
-Promise.resolve(runBrowserTests()).catch(error =>
+Promise.resolve(runBrowserTests(runnerProcesses)).catch(error =>
 {
   console.error("Failed running browser tests");
   console.error(error);
 }).then(() =>
 {
   if (unitFiles.length)
     nodeunit.reporters.default.run(unitFiles);
 });