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MyNewProjectName.UnitTest/Application/CreateSampleCommandValidatorTests.cs

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+using FluentAssertions;
+using FluentValidation.TestHelper;
+using MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+
+namespace MyNewProjectName.UnitTest.Application;
+
+public class CreateSampleCommandValidatorTests
+{
+    private readonly CreateSampleCommandValidator _validator;
+
+    public CreateSampleCommandValidatorTests()
+    {
+        _validator = new CreateSampleCommandValidator();
+    }
+
+    [Fact]
+    public void Validate_WithValidCommand_ShouldNotHaveErrors()
+    {
+        // Arrange
+        var command = new CreateSampleCommand("Test Name", "Test Description");
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Fact]
+    public void Validate_WithEmptyName_ShouldHaveError()
+    {
+        // Arrange
+        var command = new CreateSampleCommand("", "Test Description");
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor(x => x.Name);
+    }
+
+    [Fact]
+    public void Validate_WithNameExceeding200Characters_ShouldHaveError()
+    {
+        // Arrange
+        var longName = new string('a', 201);
+        var command = new CreateSampleCommand(longName, "Test Description");
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor(x => x.Name);
+    }
+
+    [Fact]
+    public void Validate_WithDescriptionExceeding1000Characters_ShouldHaveError()
+    {
+        // Arrange
+        var longDescription = new string('a', 1001);
+        var command = new CreateSampleCommand("Test Name", longDescription);
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor(x => x.Description);
+    }
+
+    [Fact]
+    public void Validate_WithNullDescription_ShouldNotHaveError()
+    {
+        // Arrange
+        var command = new CreateSampleCommand("Test Name", null);
+
+        // Act
+        var result = _validator.TestValidate(command);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor(x => x.Description);
+    }
+}