Added unit tests for HeaderFieldRegexValidator

Author: ianfnelson

tests/ServiceLayer.Mesh.Tests/FileTypes/NbssAppointmentEvents/Validation/HeaderFieldRegexValidatorTests.cs

@@ -0,0 +1,67 @@
+using System.Text.RegularExpressions;
+using ServiceLayer.Mesh.FileTypes.NbssAppointmentEvents.Validation;
+
+namespace ServiceLayer.Mesh.Tests.FileTypes.NbssAppointmentEvents.Validation;
+
+public partial class HeaderFieldRegexValidatorTests
+{
+    private const string FieldName = "TestField";
+    private const string MissingCode = "ERR001";
+    private const string InvalidFormatCode = "ERR002";
+    private readonly Regex _pattern = TestRegex();
+
+    [Fact]
+    public void Validate_NullValue_ShouldReturnMissingError()
+    {
+        // Arrange
+        var file = TestDataBuilder.BuildValidParsedFile();
+        file.FileHeader!.ExtractId = null;
+
+        var validator = new HeaderFieldRegexValidator(x => x.ExtractId, FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        // Act
+        var errors = validator.Validate(file).ToList();
+
+        // Assert
+        errors.ShouldContainValidationError(FieldName, $"{FieldName} is missing", MissingCode, ValidationErrorScope.Header);
+    }
+
+    [Theory]
+    [InlineData("")]
+    [InlineData("invalid")]
+    public void Validate_ValueNotMatchingPattern_ShouldReturnInvalidFormatError(string invalidValue)
+    {
+        // Arrange
+        var file = TestDataBuilder.BuildValidParsedFile();
+        file.FileHeader!.ExtractId = invalidValue;
+
+        var validator = new HeaderFieldRegexValidator(x => x.ExtractId, FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        // Act
+        var errors = validator.Validate(file).ToList();
+
+        // Assert
+        errors.ShouldContainValidationError(FieldName, $"{FieldName} is in an invalid format", InvalidFormatCode,ValidationErrorScope.Header);
+    }
+
+    [Theory]
+    [InlineData("AB12")]
+    [InlineData("CD34")]
+    public void Validate_ValueMatchingPattern_ShouldReturnNoErrors(string validValue)
+    {
+        // Arrange
+        var file = TestDataBuilder.BuildValidParsedFile();
+        file.FileHeader!.ExtractId = validValue;
+
+        var validator = new HeaderFieldRegexValidator(x => x.ExtractId, FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        // Act
+        var errors = validator.Validate(file).ToList();
+
+        // Assert
+        Assert.Empty(errors);
+    }
+
+    [GeneratedRegex(@"^[A-Z]{2}\d{2}$", RegexOptions.Compiled)]
+    private static partial Regex TestRegex();
+}

tests/ServiceLayer.Mesh.Tests/FileTypes/NbssAppointmentEvents/Validation/RegexValidatorTests.cs

@@ -56,6 +56,7 @@ public void Validate_ValueNotMatchingPattern_ShouldReturnInvalidFormatError(stri
     [InlineData("CD34")]
     public void Validate_ValueMatchingPattern_ShouldReturnNoErrors(string validValue)
     {
+        // Arrange
         var record = new FileDataRecord
         {
             RowNumber = 3
@@ -64,8 +65,10 @@ public void Validate_ValueMatchingPattern_ShouldReturnNoErrors(string validValue
 
         var validator = new RegexValidator(FieldName, _pattern, MissingCode, InvalidFormatCode);
 
+        // Act
         var errors = validator.Validate(record).ToList();
 
+        // Assert
         Assert.Empty(errors);
     }