chore(curriculum): add domain variety to email masking visible tests (#61069)

curriculum/challenges/english/25-front-end-development/lab-email-masker/66b205e6eacba4c4e54ea434.md

@@ -21,6 +21,8 @@ Fulfill the user stories below and get all the tests to pass to complete the lab
 4. Call the `maskEmail` function with the `email` variable and output the result to the console. 
 5. `maskEmail("apple.pie@example.com")` should return `"a*******e@example.com"`.
 6. `maskEmail("freecodecamp@example.com")` should return `"f**********p@example.com"`.
+7. `maskEmail("info@test.dev")` should return `"i**o@test.dev"`.
+8. `maskEmail("user@domain.org")` should return `"u**r@domain.org"`.
 
 # --hints--
 
@@ -60,6 +62,18 @@ assert.strictEqual(maskEmail("apple.pie@example.com"),"a*******e@example.com");
 assert.strictEqual(maskEmail("freecodecamp@example.com"), "f**********p@example.com");
 ```
 
+`maskEmail("info@test.dev")` should return `"i**o@test.dev"`.
+
+```js
+assert.strictEqual(maskEmail("info@test.dev"), "i**o@test.dev");
+```
+
+`maskEmail("user@domain.org")` should return `"u**r@domain.org"`.
+
+```js
+assert.strictEqual(maskEmail("user@domain.org"), "u**r@domain.org");
+```
+
 Your `maskEmail` should produce the correct result.
 
 ```js