add unit tests

tests/Application.UnitTest/Validators/LoginRequestValidatorTests.cs

@@ -0,0 +1,33 @@
+using Application.Models;
+using Application.Validators;
+
+namespace Application.UnitTest.Validators;
+
+public class LoginRequestValidatorTests
+{
+    private readonly LoginRequestValidator _sut = new();
+
+    [Fact]
+    public void Validate_ShouldPass_WhenAllFieldsAreValid()
+    {
+        var request = new LoginRequest("test@example.com", "password123");
+
+        var result = _sut.Validate(request);
+
+        Assert.True(result.IsValid);
+    }
+
+    [Theory]
+    [InlineData("", "password123", "Email")]
+    [InlineData("not-an-email", "password123", "Email")]
+    [InlineData("test@example.com", "", "Password")]
+    public void Validate_ShouldFail_WhenFieldIsInvalid(string email, string password, string expectedProperty)
+    {
+        var request = new LoginRequest(email, password);
+
+        var result = _sut.Validate(request);
+
+        Assert.False(result.IsValid);
+        Assert.Contains(result.Errors, e => e.PropertyName == expectedProperty);
+    }
+}