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@@ -90,6 +90,29 @@ public class WriterTests
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File.Delete(testFile);
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}
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+ private const string ForAppendHeaderFirst = "testFiles/forAppendHeaderFirst.xlsx";
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+
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+ [Fact]
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+ public void WriteWithAppendExistingHeaderFirst()
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+ {
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+ var testFile = Path.GetRandomFileName();
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+ testFile = Path.ChangeExtension(testFile, "xlsx");
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+ File.Copy(ForAppendHeaderFirst, testFile);
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+
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+ var writer = new ExcelWriter(testFile);
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+ writer.Write(arrayOfThree, append: true);
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+ writer.SaveAs(testFile);
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+
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+ var reader = new ExcelReader(testFile);
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+ var readArray = reader.Read<Test>().ToArray();
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+ Assert.Equal(6, readArray.Length);
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+
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+ for (int i = 0; i < arrayOfThree.Length; i++)
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+ Assert.Equal(arrayOfThree[i], readArray[i + 3]);
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+
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+ File.Delete(testFile);
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+ }
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+
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[Fact]
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public void WriteDifferentTypes()
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{
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