Added better domain tests.

Tests/Domain.UnitTests/Common/CountryTests.cs

@@ -0,0 +1,32 @@
+using Northwind.Domain.Common;
+
+namespace Northwind.Domain.UnitTests.Common;
+
+public class CountryTests
+{
+    [Fact]
+    public void IsAustralia_GivenAustralianCountry_ReturnsTrue()
+    {
+        // Arrange
+        var country = new Country("Australia");
+
+        // Act
+        var result = country.IsAustralia;
+
+        // Assert
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public void IsAustralia_GivenNonAustralianCountry_ReturnsFalse()
+    {
+        // Arrange
+        var country = new Country("New Zealand");
+
+        // Act
+        var result = country.IsAustralia;
+
+        // Assert
+        result.Should().BeFalse();
+    }
+}

Tests/Domain.UnitTests/Common/PhoneTests.cs

@@ -0,0 +1,32 @@
+using Northwind.Domain.Customers;
+
+namespace Northwind.Domain.UnitTests.Common;
+
+public class PhoneTests
+{
+    [Fact]
+    public void IsQueenslandLandline_GivenQLDNumber_ReturnsTrue()
+    {
+        // Arrange
+        var phone = new Phone("0733333333");
+
+        // Act
+        var result = phone.IsQueenslandLandLine;
+
+        // Assert
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public void IsQueenslandLandline_GivenNonQLDNumber_ReturnsFalse()
+    {
+        // Arrange
+        var phone = new Phone("0833333333");
+
+        // Act
+        var result = phone.IsQueenslandLandLine;
+
+        // Assert
+        result.Should().BeFalse();
+    }
+}

Tests/Domain.UnitTests/Common/PostCodeTests.cs

@@ -0,0 +1,32 @@
+using Northwind.Domain.Common;
+
+namespace Northwind.Domain.UnitTests.Common;
+
+public class PostCodeTests
+{
+    [Fact]
+    public void IsQueenslandPostCode_GivenQLDPostCode_ReturnsTrue()
+    {
+        // Arrange
+        var postCode = new PostCode("4000");
+
+        // Act
+        var result = postCode.IsQueenslandPostCode;
+
+        // Assert
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public void IsQueenslandPostCode_GivenNonQLDPostCode_ReturnsFalse()
+    {
+        // Arrange
+        var postCode = new PostCode("2000");
+
+        // Act
+        var result = postCode.IsQueenslandPostCode;
+
+        // Assert
+        result.Should().BeFalse();
+    }
+}

Tests/Domain.UnitTests/Customers/CustomerTests.cs

@@ -1,7 +1,5 @@
 using Common.Factories;
-using FluentAssertions;
 using Northwind.Domain.Customers;
-using Xunit;
 
 namespace Northwind.Domain.UnitTests.Customers;
 

Tests/Domain.UnitTests/GlobalUsings.cs

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+// Global using directives
+
+global using FluentAssertions;
+global using Xunit;