regex validator tests

Author: ianfnelson

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

@@ -0,0 +1,71 @@
+using ServiceLayer.Mesh.FileTypes.NbssAppointmentEvents.Validation;
+using System.Text.RegularExpressions;
+using ServiceLayer.Mesh.FileTypes.NbssAppointmentEvents.Models;
+
+namespace ServiceLayer.Mesh.Tests.FileTypes.NbssAppointmentEvents.Validation;
+
+public class RegexValidatorTests
+{
+    private const string FieldName = "TestField";
+    private const string MissingCode = "ERR001";
+    private const string InvalidFormatCode = "ERR002";
+    private readonly Regex _pattern = new(@"^[A-Z]{2}\d{2}$", RegexOptions.Compiled);
+
+    [Fact]
+    public void NullValue_ShouldReturnMissingError()
+    {
+        // Arrange
+        var record = new FileDataRecord
+        {
+            RowNumber = 1
+        };
+        record.Fields.Clear();
+
+        var validator = new RegexValidator(FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        // Act
+        var errors = validator.Validate(record).ToList();
+
+        // Assert
+        errors.ShouldContainValidationError(FieldName, $"{FieldName} is missing", MissingCode, 1);
+    }
+
+    [Theory]
+    [InlineData("")]
+    [InlineData("invalid")]
+    public void ValueNotMatchingPattern_ShouldReturnInvalidFormatError(string invalidValue)
+    {
+        // Arrange
+        var record = new FileDataRecord
+        {
+            RowNumber = 2
+        };
+        record.Fields.Add(FieldName, invalidValue);
+
+        var validator = new RegexValidator(FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        // Act
+        var errors = validator.Validate(record).ToList();
+
+        // Assert
+        errors.ShouldContainValidationError(FieldName, $"{FieldName} is in an invalid format", InvalidFormatCode, 2);
+    }
+
+    [Theory]
+    [InlineData("AB12")]
+    [InlineData("CD34")]
+    public void ValueMatchingPattern_ShouldReturnNoErrors(string validValue)
+    {
+        var record = new FileDataRecord
+        {
+            RowNumber = 3
+        };
+        record.Fields.Add(FieldName, validValue);
+
+        var validator = new RegexValidator(FieldName, _pattern, MissingCode, InvalidFormatCode);
+
+        var errors = validator.Validate(record).ToList();
+
+        Assert.Empty(errors);
+    }
+}