Make sure the terminal opens

The selector was timing out even though it matched more than one element
but matching on the focused one appears to work.

In addition add a loop so even it can keep trying to open the terminal
if something goes wrong with the focus.

test/e2e/models/CodeServer.ts

@@ -292,10 +292,24 @@ export class CodeServerPage {
   async focusTerminal() {
     // We need to create a new terminal since multiple tests could be running at
     // once and they will step over each other if they use the same terminal.
-    await this.executeCommandViaMenus("Terminal: Create New Terminal")
+    const doFocus = async (): Promise<boolean> => {
+      await this.executeCommandViaMenus("Terminal: Create New Terminal")
+      try {
+        await this.page.waitForLoadState("load")
+        await this.page.waitForSelector("textarea.xterm-helper-textarea:focus-within", { timeout: 5000 })
+        return true
+      } catch (error) {
+        return false
+      }
+    }
+
+    let attempts = 1
+    while(!(await doFocus())) {
+      ++attempts
+      this.codeServer.logger.debug(`no terminal textarea, retrying (${attempts}/∞)`)
+    }
 
-    // Wait for terminal textarea to show up
-    await this.page.waitForSelector("textarea.xterm-helper-textarea")
+    this.codeServer.logger.debug(`opening terminal took ${attempts} ${plural(attempts, "attempt")}`)
   }
 
   /**
@@ -423,7 +437,7 @@ export class CodeServerPage {
     let context = new Context()
     while (!(await Promise.race([openThenWaitClose(context), navigate(context)]))) {
       ++attempts
-      logger.debug("closed, retrying (${attempt}/∞)")
+      logger.debug(`closed, retrying (${attempts}/∞)`)
       context.cancel()
       context = new Context()
     }

test/e2e/terminal.test.ts

@@ -22,7 +22,6 @@ describe("Integrated Terminal", true, [], {}, () => {
     // Open terminal and type in value
     await codeServerPage.focusTerminal()
 
-    await codeServerPage.page.waitForLoadState("load")
     await codeServerPage.page.keyboard.type(`printenv VSCODE_PROXY_URI > ${tmpFile}`)
     await codeServerPage.page.keyboard.press("Enter")
 
@@ -34,13 +33,13 @@ describe("Integrated Terminal", true, [], {}, () => {
     const tmpFolderPath = await tmpdir(testName)
     const tmpFile = path.join(tmpFolderPath, "test-file")
     await fs.writeFile(tmpFile, "test")
+    const fileName = path.basename(tmpFile)
 
     await codeServerPage.focusTerminal()
 
-    await codeServerPage.page.waitForLoadState("load")
     await codeServerPage.page.keyboard.type(`code-server ${tmpFile}`)
     await codeServerPage.page.keyboard.press("Enter")
 
-    await codeServerPage.waitForTab(path.basename(tmpFile))
+    await codeServerPage.waitForTab(fileName)
   })
 })