1 files changed, 30 insertions, 0 deletions
diff --git a/RhSolutions.Tests/CalculationTests.cs b/RhSolutions.Tests/CalculationTests.cs
new file mode 100644
index 0000000..d6c54c2
--- /dev/null
+++ b/RhSolutions.Tests/CalculationTests.cs
@@ -0,0 +1,30 @@
+namespace RhSolutions.Tests;
+
+public class CalculationTests : IDisposable
+{
+    private Workbook workbook;
+
+    public CalculationTests()
+    {
+        workbook = Util.Application.Workbooks.Add();
+    }
+
+    public void Dispose()
+    {
+        workbook.Close(SaveChanges: false);
+    }
+
+    [ExcelFact]
+    public void NumbersAddCorrectly()
+    {
+        var ws = workbook.Sheets[1];
+
+        ws.Range["A1"].Value = 2.0;
+        ws.Range["A2"].Value = 3.0;
+        ws.Range["A3"].Formula = "= A1 + A2";
+
+        var result = ws.Range["A3"].Value;
+
+        Assert.Equal(5.0, result);
+    }
+}
+\ No newline at end of file