test(validators): fix naming and add missing coverage (#427)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nanotaboada

.claude/commands/pre-commit.md

@@ -5,7 +5,8 @@ Run the pre-commit checklist for this project:
 1. Update `CHANGELOG.md` `[Unreleased]` section — add an entry under the appropriate subsection (Added / Changed / Fixed / Removed) describing the changes made, referencing the issue number.
 2. Run `dotnet build --configuration Release` — must succeed.
 3. Run `dotnet test --settings .runsettings` — all tests must pass.
-4. Run `dotnet csharpier --check .` — must pass (run `dotnet csharpier .` to auto-fix).
+4. If `dotnet csharpier` is available, run `dotnet csharpier --check .` — must pass
+   (run `dotnet csharpier .` to auto-fix). Skip this step with a note if not installed.
 5. If `coderabbit` CLI is installed, run `coderabbit review --type uncommitted --prompt-only`:
    - If actionable/serious findings are reported, stop and address them before proposing the commit.
    - If only nitpick-level findings, report them and continue to the commit proposal.

CHANGELOG.md

@@ -44,6 +44,8 @@ This project uses famous football stadiums (A-Z) that hosted FIFA World Cup matc
 
 ### Added
 
+- Add `ValidateAsync_SquadNumberNegative_ReturnsValidationError` test to exercise the `GreaterThan(0)` rule with a negative value, which passes `NotEmpty()` but fails the greater-than rule (#427)
+- Add `ValidateAsync_FirstNameEmptyInUpdateRuleSet_ReturnsValidationError` test to verify the `"Update"` rule set enforces structural field validation (#427)
 - Add `adr/` directory with 12 Architecture Decision Records documenting architectural choices, technology decisions, and design trade-offs (#372)
 - Add ADR index and template at `adr/README.md` (#372)
 - Add Architecture Decisions section to `README.md` referencing the ADR index (#372)
@@ -52,6 +54,8 @@ This project uses famous football stadiums (A-Z) that hosted FIFA World Cup matc
 
 ### Changed
 
+- Rename `ValidateAsync_SquadNumber_BelongsToPlayerBeingUpdated_ReturnsNoErrors` to `ValidateAsync_SquadNumberBelongsToPlayerBeingUpdated_ReturnsNoErrors` to align with the 3-segment naming convention for service/validator tests (#427)
+- Make CSharpier step in `/pre-commit` conditional (skip with a note if not installed), consistent with the Docker and CodeRabbit steps (#427)
 - Add "Verify tag commit is reachable from master" step to CD workflow using `git merge-base --is-ancestor` before any build or publish steps (#439)
 
 ### Fixed

test/Dotnet.Samples.AspNetCore.WebApi.Tests/Unit/PlayerValidatorTests.cs

@@ -123,6 +123,30 @@ public async Task ValidateAsync_SquadNumberNotGreaterThanZero_ReturnsValidationE
         result.Errors.Should().Contain(error => error.PropertyName == "SquadNumber");
     }
 
+    [Fact]
+    [Trait("Category", "Unit")]
+    public async Task ValidateAsync_SquadNumberNegative_ReturnsValidationError()
+    {
+        // Arrange
+        var request = PlayerFakes.MakeRequestModelForCreate();
+        request.SquadNumber = -5;
+        var validator = CreateValidator();
+
+        // Act
+        var result = await validator.ValidateAsync(
+            request,
+            options => options.IncludeRuleSets("Create")
+        );
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result
+            .Errors.Should()
+            .Contain(error =>
+                error.PropertyName == "SquadNumber" && error.ErrorMessage.Contains("greater than 0")
+            );
+    }
+
     [Fact]
     [Trait("Category", "Unit")]
     public async Task ValidateAsync_SquadNumberNotUnique_ReturnsValidationError()
@@ -153,7 +177,7 @@ public async Task ValidateAsync_SquadNumberNotUnique_ReturnsValidationError()
 
     [Fact]
     [Trait("Category", "Unit")]
-    public async Task ValidateAsync_SquadNumber_BelongsToPlayerBeingUpdated_ReturnsNoErrors()
+    public async Task ValidateAsync_SquadNumberBelongsToPlayerBeingUpdated_ReturnsNoErrors()
     {
         // Arrange
         // Simulate a PUT request for an existing player: the squad number in the
@@ -178,6 +202,26 @@ public async Task ValidateAsync_SquadNumber_BelongsToPlayerBeingUpdated_ReturnsN
         result.Errors.Should().BeEmpty();
     }
 
+    [Fact]
+    [Trait("Category", "Unit")]
+    public async Task ValidateAsync_FirstNameEmptyInUpdateRuleSet_ReturnsValidationError()
+    {
+        // Arrange
+        var request = PlayerFakes.MakeRequestModelForUpdate(10);
+        request.FirstName = string.Empty;
+        var validator = CreateValidator();
+
+        // Act
+        var result = await validator.ValidateAsync(
+            request,
+            options => options.IncludeRuleSets("Update")
+        );
+
+        // Assert
+        result.IsValid.Should().BeFalse();
+        result.Errors.Should().Contain(error => error.PropertyName == "FirstName");
+    }
+
     /* -------------------------------------------------------------------------
      * AbbrPosition
      * ---------------------------------------------------------------------- */