diff --git a/src/checkPassword.test.js b/src/checkPassword.test.js
index 1e77e16..cd61a05 100644
--- a/src/checkPassword.test.js
+++ b/src/checkPassword.test.js
@@ -8,12 +8,56 @@ describe(`Function 'checkPassword':`, () => {
   });
 
   it(`should return boolean`, () => {
+    const result = checkPassword('Password1!');
 
+    expect(typeof result).toBe('boolean');
   });
 
-  it(`should return 'true' for the valid password with 8 characters`, () => {
+  it(`should return true for a valid password (example: 'Password1!')`, () => {
+    expect(checkPassword('Password1!')).toBe(true);
+  });
+
+  it(`should return false for password with less than 8 characters`, () => {
+    expect(checkPassword('P@ss1')).toBe(false);
+  });
+
+  it(`should return false for password with more than 16 characters`, () => {
+    expect(checkPassword('Password12345678!')).toBe(false);
+  });
+
+  it(`should return false for password without uppercase letter`, () => {
+    expect(checkPassword('password1!')).toBe(false);
+  });
+
+  it(`should return false for password without digit`, () => {
+    expect(checkPassword('Password!')).toBe(false);
+  });
+
+  it(`should return false for password without special character`, () => {
+    expect(checkPassword('Password1')).toBe(false);
+  });
+
+  it(`should return false for password containing Cyrillic letters`, () => {
+    expect(checkPassword('Пароль1!')).toBe(false);
+  });
+
+  it(`should return false for password with only lowercase letters`, () => {
+    expect(checkPassword('qwertyui')).toBe(false);
+  });
 
+  it(`should return false for password with only uppercase letters`, () => {
+    expect(checkPassword('PASSWORD1!')).toBe(false);
   });
 
-  // write more tests here
+  it(`should return true for valid password of exactly 8 characters`, () => {
+    expect(checkPassword('Passw1!A')).toBe(true);
+  });
+
+  it(`should return true for valid password of exactly 16 characters`, () => {
+    expect(checkPassword('ValidPassw1!Word')).toBe(true);
+  });
+
+  it(`should return false for password with spaces`, () => {
+    expect(checkPassword('Pass word1!')).toBe(false);
+  });
 });