Fixed test

Author: bahusoid

src/NHibernate.Test/MappingTest/ColumnFixture.cs

@@ -81,7 +81,7 @@ public void GetAliasWithTableSuffixRespectsMaxAliasLength(string columnName)
 			// Test case is meant for a max length of 10, adjusts name if it is more.
 			columnName = AdjustColumnNameToMaxLength(columnName, dialect, 10);
 
-			var table = new Table();
+			var table = new Table() {UniqueInteger = 1};
 			var column = new Column(columnName);
 
 			string generatedAlias = column.GetAlias(dialect, table);

src/NHibernate/Mapping/Table.cs

@@ -185,12 +185,13 @@ public string Schema
 
 		/// <summary>
 		/// Gets the unique number of the Table.
+		/// Used for SQL alias generation
 		/// </summary>
 		/// <value>The unique number of the Table.</value>
 		public int UniqueInteger
 		{
 			get { return uniqueInteger ?? throw new InvalidOperationException(nameof(UniqueInteger) + " has not been supplied"); }
-			internal set { uniqueInteger = value; }
+			set { uniqueInteger = value; }
 		}
 
 		/// <summary>