diff --git a/RhSolutions.Tests/CanWriteProducts.cs b/RhSolutions.Tests/CanWriteProducts.cs
index 3792914..a6ddf38 100644
--- a/RhSolutions.Tests/CanWriteProducts.cs
+++ b/RhSolutions.Tests/CanWriteProducts.cs
@@ -17,7 +17,7 @@ public class CanWriteProducts : IDisposable
         _reader = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IReader>();
     }
 
-    [ExcelFact(Workbook = @"TestWorkbooks\TestSpecification.xlsx")]
+    [ExcelFact(Workbook = @"..\..\..\TestWorkbooks\TestSpecification.xlsx")]
     public void CanWriteSingle()
     {
         Worksheet sourceSheet = Util.Workbook.Worksheets[1];
@@ -34,6 +34,22 @@ public class CanWriteProducts : IDisposable
         Assert.Equal(products.First().Item2.Values.Sum(), targetProducts.First().Item2.Values.Sum());
     }
 
+    [ExcelFact(Workbook = @"..\..\..\TestWorkbooks\TestSpecificationMultipleProductLines.xlsx")]
+    public void CanWriteMultipleProductLines()
+    {
+        Worksheet sourceSheet = Util.Workbook.Worksheets[1];
+        RhSolutionsAddIn.Configuration.SetPriceListPath(Path.GetFullPath(@"..\..\..\TestWorkbooks\TargetSpecificationMultipleProductLines.xlsx"));
+        var products = _reader.ReadProducts(new[] { sourceSheet });
+        var _writer = new ExcelWriter(Util.Application, RhSolutionsAddIn.Configuration);
+        _writer.WriteProducts(products);
+        Worksheet targetSheet = Util.Application.ActiveWindow.ActiveSheet;
+        var targetProducts = _reader.ReadProducts(new[] { targetSheet });
+
+        Assert.Equal("TestSpecificationMultipleProductLines", products.First().Item1);
+        Assert.Equal("TargetSpecificationMultipleProductLines", targetProducts.First().Item1);
+        Assert.True(Enumerable.SequenceEqual(products.First().Item2, targetProducts.First().Item2));
+    }
+
     public void Dispose()
     {
         _addIn.AutoClose();
diff --git a/RhSolutions.Tests/TestWorkbooks/TargetSpecificationMultipleProductLines.xlsx b/RhSolutions.Tests/TestWorkbooks/TargetSpecificationMultipleProductLines.xlsx
new file mode 100644
index 0000000..a83ff99
Binary files /dev/null and b/RhSolutions.Tests/TestWorkbooks/TargetSpecificationMultipleProductLines.xlsx differ
diff --git a/RhSolutions.Tests/TestWorkbooks/TestSpecificationMultipleProductLines.xlsx b/RhSolutions.Tests/TestWorkbooks/TestSpecificationMultipleProductLines.xlsx
new file mode 100644
index 0000000..0360be6
Binary files /dev/null and b/RhSolutions.Tests/TestWorkbooks/TestSpecificationMultipleProductLines.xlsx differ