Add validator tests for brewery and user commands (#282)

web/backend/Features/Features.Breweries.Tests/Commands/UpdateBreweryValidatorTests.cs

@@ -0,0 +1,32 @@
+using Features.Breweries.Commands.UpdateBrewery;
+using FluentValidation.TestHelper;
+
+namespace Features.Breweries.Tests.Commands;
+
+public class UpdateBreweryValidatorTests
+{
+    private readonly UpdateBreweryValidator _validator = new();
+
+    private static UpdateBreweryCommand ValidCommand() =>
+        new(Guid.NewGuid(), Guid.NewGuid(), [0x01, 0x02], "Name", "Description", null);
+
+    [Fact]
+    public void Validate_ValidCommand_HasNoValidationErrors()
+    {
+        TestValidationResult<UpdateBreweryCommand> result = _validator.TestValidate(ValidCommand());
+
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Fact]
+    public void Validate_EmptyRowVersion_HasErrorForRowVersion()
+    {
+        UpdateBreweryCommand command = ValidCommand() with { RowVersion = [] };
+
+        TestValidationResult<UpdateBreweryCommand> result = _validator.TestValidate(command);
+
+        result
+            .ShouldHaveValidationErrorFor(x => x.RowVersion)
+            .WithErrorMessage("RowVersion is required to detect conflicting concurrent updates.");
+    }
+}