diff --git a/src/validateRegisterForm.test.js b/src/validateRegisterForm.test.js
index 6d86ab9..42d0470 100644
--- a/src/validateRegisterForm.test.js
+++ b/src/validateRegisterForm.test.js
@@ -12,19 +12,117 @@ describe(`Function 'validateRegisterForm':`, () => {
       .toBe('object');
   });
 
-  it(`should return success message for the valid input`, () => {
-    const isValid = validateRegisterForm('test@mail.com', 'P@ssword1!');
+  it(`success message for the valid input`, () => {
+    const result = validateRegisterForm('test@mail.com', 'P@ssword1!Абс');
 
-    expect(isValid.code).toBe(200);
-    expect(isValid.message).toBe('Email and password are valid.');
+    expect(result.code).toBe(200);
+    expect(result.message).toBe('Email and password are valid.');
   });
 
-  it(`should return error for valid email and password without number`, () => {
-    const invalidPassword = validateRegisterForm('test@mail.com', 'P@ssword');
+  it(`error for valid email and password missing digit`, () => {
+    const result = validateRegisterForm('test@mail.com', 'P@ssword!');
 
-    expect(invalidPassword.code).toBe(422);
-    expect(invalidPassword.message).toBe('Password is invalid.');
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
   });
 
-  // write more tests here
+  it(`error for valid email and password missing special char`, () => {
+    const result = validateRegisterForm('test@mail.com', 'Password1');
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
+  });
+
+  it(`error for valid email and password missing uppercase letter`, () => {
+    const result = validateRegisterForm('test@mail.com', 'password!1');
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
+  });
+
+  it(`error for valid email and password length < 8`, () => {
+    const result = validateRegisterForm('test@mail.com', 'Test!1');
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
+  });
+
+  it(`error for valid email and password length > 16`, () => {
+    const result = validateRegisterForm(
+      'test@mail.com', 'TestPassword!123456789'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
+  });
+
+  it(`error for empty password`, () => {
+    const result = validateRegisterForm('test@mail.com', '');
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Password is invalid.');
+  });
+
+  it(`error for empty email`, () => {
+    const result = validateRegisterForm(
+      '', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for email missing english letters`, () => {
+    const result = validateRegisterForm(
+      'тест@mail.com', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for email missing @`, () => {
+    const result = validateRegisterForm(
+      'testmail.com', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for email if top level domain start with dot`, () => {
+    const result = validateRegisterForm(
+      'test@.mail.com', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for email if email start with dot`, () => {
+    const result = validateRegisterForm(
+      '.test@mail.com', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for email if email has double dots`, () => {
+    const result = validateRegisterForm(
+      'te..st@mail.com', 'Password!1'
+    );
+
+    expect(result.code).toBe(422);
+    expect(result.message).toBe('Email is invalid.');
+  });
+
+  it(`error for not valid email and password`, () => {
+    const result = validateRegisterForm(
+      'te..st@mail.com', 'Password'
+    );
+
+    expect(result.code).toBe(500);
+    expect(result.message).toBe('Password and email are invalid.');
+  });
 });