Add unit test for browser finder and child_process execution (#2300)

* Add unit test for browser finder and child_process execution

* test for windows only

---------

Co-authored-by: Ezio Li <[email protected]>

Author: lexie011

test/extension/appLauncher.test.ts

@@ -5,6 +5,10 @@ import * as assert from "assert";
 import * as vscode from "vscode";
 import * as path from "path";
 import * as fs from "fs";
+import * as BrowserHelper from "vscode-js-debug-browsers";
+import * as sinon from "sinon";
+import * as child_process from "child_process";
+import * as os from "os";
 import { AppLauncher } from "../../src/extension/appLauncher";
 import { ProjectsStorage } from "../../src/extension/projectsStorage";
 import { activate, deactivate } from "../../src/extension/rn-extension";
@@ -174,4 +178,28 @@ suite("appLauncher", function () {
             assert.notStrictEqual(nodeModulesRoot1, nodeModulesRoot2);
         });
     });
+    suite("launchBrowser", function () {
+        test("expo web launch on edge browser", async function () {
+            // test for windows only
+            if (os.platform() === "win32") {
+                try {
+                    const browserPath = {
+                        path: "C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe",
+                    };
+                    const browserFinderStub = sinon.stub(
+                        BrowserHelper.EdgeBrowserFinder.prototype,
+                        "findAll",
+                    );
+                    browserFinderStub.returns(Promise.resolve([browserPath]));
+                    child_process.spawn(browserPath.path, {
+                        detached: true,
+                        stdio: ["ignore"],
+                    });
+                    browserFinderStub.restore();
+                } catch (err) {
+                    assert.fail(err);
+                }
+            }
+        });
+    });
 });