Add some test cases to the password strength service (#7483)

Co-authored-by: Daniel James Smith <2670567+djsmith85@users.noreply.github.com>

libs/common/src/tools/password-strength/password-strength.service.spec.ts

@@ -0,0 +1,27 @@
+import { PasswordStrengthService } from "./password-strength.service";
+
+describe("PasswordStrengthService", () => {
+  test.each([
+    ["password", "random@bitwarden.com", 0],
+    ["password11", "random@bitwarden.com", 1],
+    ["Weakpass2", "random@bitwarden.com", 2],
+    ["GoodPass3!", "random@bitwarden.com", 3],
+    ["VeryStrong123@#", "random@bitwarden.com", 4],
+  ])("getPasswordStrength(%s, %s) should return %i", (password, email, expected) => {
+    const service = new PasswordStrengthService();
+
+    const result = service.getPasswordStrength(password, email);
+
+    expect(result.score).toBe(expected);
+  });
+
+  it("getPasswordStrength should penalize passwords that contain the email address", () => {
+    const service = new PasswordStrengthService();
+
+    const resultWithoutEmail = service.getPasswordStrength("asdfjkhkjwer!", "random@bitwarden.com");
+    expect(resultWithoutEmail.score).toBe(4);
+
+    const result = service.getPasswordStrength("asdfjkhkjwer!", "asdfjkhkjwer@bitwarden.com");
+    expect(result.score).toBe(1);
+  });
+});