[ksqlDB.RestApi.Client]: added FieldTypeBuilder pseudocolumn unit tests #96

Author: tomasfabian

Tests/ksqlDB.RestApi.Client.Tests/FluentAPI/FieldTypeBuilderTests.cs

@@ -1,8 +1,11 @@
+using System.Linq.Expressions;
 using FluentAssertions;
 using ksqlDb.RestApi.Client.FluentAPI.Builders;
+using ksqlDB.RestApi.Client.KSql.Query;
 using ksqlDb.RestApi.Client.Metadata;
 using ksqlDb.RestApi.Client.Tests.Models;
 using NUnit.Framework;
+using Assert = Microsoft.VisualStudio.TestTools.UnitTesting.Assert;
 
 namespace ksqlDb.RestApi.Client.Tests.FluentAPI
 {
@@ -95,9 +98,15 @@ public void AsStruct()
     }
 
     [Test]
-    public void AsPseudoColumn()
+    public void AsPseudoColumn_IsValid()
     {
       //Arrange
+      Expression<Func<Record, long>> expression = c => c.RowTime;
+      fieldMetadata = new()
+      {
+        MemberInfo = ((MemberExpression)expression.Body).Member
+      };
+      builder = new(fieldMetadata);
 
       //Act
       var fieldTypeBuilder = builder.AsPseudoColumn();
@@ -107,6 +116,25 @@ public void AsPseudoColumn()
       fieldMetadata.IsPseudoColumn.Should().BeTrue();
     }
 
+    [Test]
+    public void AsPseudoColumn_IsNotValid()
+    {
+      //Arrange
+      Expression<Func<Tweet, double>> expression = c => c.Amount;
+      fieldMetadata = new()
+      {
+        MemberInfo = ((MemberExpression)expression.Body).Member
+      };
+      builder = new(fieldMetadata);
+
+      //Act
+      Assert.ThrowsException<InvalidOperationException>(() =>
+      {
+        //Act
+        builder.AsPseudoColumn();
+      });
+    }
+
     [Test]
     public void HasColumnName()
     {