Added more tests

Author: alex-jitbit

UnitTests/UnitTests.cs

@@ -82,6 +82,15 @@ public void TestGeneric()
 			Assert.IsTrue(csv.Trim() == "sep=,\r\nId,Name\r\n123,Ffff\r\n321,ddd", csv);
 		}
 
+		[TestMethod]
+		public void TestEmpty()
+		{
+			var myExport = new CsvExport();
+			string csv = myExport.Export();
+
+			Assert.IsTrue(csv.Trim() == "sep=,", csv);
+		}
+
 		[TestMethod]
 		public void WriteToFile()
 		{
@@ -104,11 +113,130 @@ public void WriteToFile()
 
 			File.Delete(filePath);
 		}
+
+		[TestMethod]
+		public void TestConstructorParameters()
+		{
+			// Test custom separator
+			var export1 = new CsvExport(";");
+			export1.AddRow();
+			export1["Name"] = "John";
+			export1["Value"] = "Test;Data";
+			string result1 = export1.Export();
+			Assert.IsTrue(result1.Contains("sep=;"));
+			Assert.IsTrue(result1.Contains("Name;Value"));
+			Assert.IsTrue(result1.Contains("\"Test;Data\""));
+
+			// Test no preamble
+			var export2 = new CsvExport(",", false);
+			export2.AddRow();
+			export2["Name"] = "John";
+			string result2 = export2.Export();
+			Assert.IsFalse(result2.Contains("sep="));
+			Assert.IsTrue(result2.StartsWith("Name\r\n"));
+
+			// Test no header
+			var export3 = new CsvExport(",", true, false);
+			export3.AddRow();
+			export3["Name"] = "John";
+			string result3 = export3.Export();
+			Assert.IsTrue(result3.Contains("sep="));
+			Assert.IsFalse(result3.Contains("Name\r\n"));
+			Assert.IsTrue(result3.Contains("John"));
+		}
+
+		[TestMethod]
+		public void TestNullValues()
+		{
+			var myExport = new CsvExport();
+			myExport.AddRow();
+			myExport["Name"] = "John";
+			myExport["Value"] = null;
+			myExport["Number"] = 123;
+
+			string csv = myExport.Export();
+			Assert.IsTrue(csv.Contains("John,,123"));
+		}
+
+		[TestMethod]
+		public void TestSpecialCharacters()
+		{
+			var myExport = new CsvExport();
+			myExport.AddRow();
+			myExport["Newline"] = "Line1\nLine2";
+			myExport["CarriageReturn"] = "Text1\rText2";
+			myExport["Both"] = "Start\r\nEnd";
+
+			string csv = myExport.Export();
+			Assert.IsTrue(csv.Contains("\"Line1\nLine2\""));
+			Assert.IsTrue(csv.Contains("\"Text1\rText2\""));
+			Assert.IsTrue(csv.Contains("\"Start\r\nEnd\""));
+		}
+
+		[TestMethod]
+		public void TestLargeDataTruncation()
+		{
+			var myExport = new CsvExport();
+			myExport.AddRow();
+			// Create a string longer than 30000 characters
+			string largeText = new string('A', 35000);
+			myExport["LargeText"] = largeText;
+
+			string csv = myExport.Export();
+			// Should be truncated to 30000 characters
+			Assert.IsTrue(csv.Contains(new string('A', 30000)));
+			Assert.IsFalse(csv.Contains(new string('A', 30001)));
+		}
+
+		[TestMethod]
+		public void TestSetValueWithoutAddRow()
+		{
+			var myExport = new CsvExport();
+			// Setting value without calling AddRow first should be ignored
+			myExport["Name"] = "Should be ignored";
+
+			myExport.AddRow();
+			myExport["Name"] = "John";
+
+			string csv = myExport.Export();
+			Assert.IsFalse(csv.Contains("Should be ignored"));
+			Assert.IsTrue(csv.Contains("John"));
+		}
+
+		[TestMethod]
+		public void TestDifferentDataTypes()
+		{
+			var myExport = new CsvExport();
+			myExport.AddRow();
+			myExport["Bool"] = true;
+			myExport["Decimal"] = 123.45m;
+			myExport["Double"] = 67.89;
+			myExport["Float"] = 12.34f;
+			myExport["Long"] = 9876543210L;
+
+			string csv = myExport.Export();
+			Assert.IsTrue(csv.Contains("True"));
+			Assert.IsTrue(csv.Contains("123.45"));
+			Assert.IsTrue(csv.Contains("67.89"));
+			Assert.IsTrue(csv.Contains("12.34"));
+			Assert.IsTrue(csv.Contains("9876543210"));
+		}
+
+		[TestMethod]
+		public void TestEmptyGenericCollection()
+		{
+			List<MyClass> emptyList = new();
+			var myExport = new CsvExport();
+			myExport.AddRows(emptyList);
+
+			string csv = myExport.Export();
+			Assert.AreEqual("sep=,", csv.Trim());
+		}
 	}
 
 	public class MyClass
 	{
 		public int Id { get; set; }
-		public string Name { get; set; }
+		public string Name { get; set; } = string.Empty;
 	}
 }