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Add String.Concat tests #217

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Oct 23, 2024
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Add String.Concat tests #217

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141 changes: 140 additions & 1 deletion Tests/NFUnitTestSystemLib/UnitTestStringTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1041,6 +1041,146 @@ public void LastIndexOf_should_return_negative_one_if_value_is_not_found()
Assert.AreEqual(-1, source.LastIndexOf(".", 1, 2), "Case 6");
}

[TestMethod]
public void Concat_should_work_with_nulls()
{
const string baseContent = "Hello";
string[] dispOut = new string[4];
dispOut[0] = baseContent;

string test = string.Concat(dispOut);

Console.WriteLine(test);

Assert.AreSame(baseContent, test);
}

[TestMethod]
public void Concat_Should_Concatenate_Two_Strings()
{
// Arrange
string str1 = "Hello";
string str2 = "World";

// Act
string result = string.Concat(str1, str2);

// Assert
Assert.AreEqual("HelloWorld", result);
}

[TestMethod]
public void Concat_Should_Concatenate_Multiple_Strings()
{
// Arrange
string str1 = "Hello";
string str2 = " ";
string str3 = "World";
string str4 = "!";

// Act
string result = string.Concat(str1, str2, str3, str4);

// Assert
Assert.AreEqual("Hello World!", result);
}

[TestMethod]
public void Concat_Should_Handle_Null_Strings()
{
// Arrange
string str1 = null;
string str2 = "World";

// Act
string result = string.Concat(str1, str2);

// Assert
Assert.AreEqual("World", result);
}

[TestMethod]
public void Concat_Should_Handle_Empty_Strings()
{
// Arrange
string str1 = "";
string str2 = "World";

// Act
string result = string.Concat(str1, str2);

// Assert
Assert.AreEqual("World", result);
}

[TestMethod]
public void Concat_Should_Handle_Null_And_Empty_Strings()
{
// Arrange
string str1 = null;
string str2 = "";
string str3 = "Hello";
string str4 = null;

// Act
string result = string.Concat(str1, str2, str3, str4);

// Assert
Assert.AreEqual("Hello", result);
}

[TestMethod]
public void Concat_Should_Concatenate_String_Array()
{
// Arrange
string[] strings = { "Hello", " ", "World", "!" };

// Act
string result = string.Concat(strings);

// Assert
Assert.AreEqual("Hello World!", result);
}

[TestMethod]
public void Concat_Should_Handle_Null_Elements_In_Array()
{
// Arrange
string[] strings = { "Hello", null, "World", "!" };

// Act
string result = string.Concat(strings);

// Assert
Assert.AreEqual("HelloWorld!", result);
}

[TestMethod]
public void Concat_Should_Handle_Empty_Elements_In_Array()
{
// Arrange
string[] strings = { "Hello", "", "World", "!" };

// Act
string result = string.Concat(strings);

// Assert
Assert.AreEqual("HelloWorld!", result);
}

[TestMethod]
public void Concat_Should_Handle_Null_And_Empty_Elements_In_Array()
{
// Arrange
string[] strings = { null, "", "Hello", null, "", "World", "!" };

// Act
string result = string.Concat(strings);

// Assert
Assert.AreEqual("HelloWorld!", result);
}

/// <summary>
/// A class whose ToString method return null
/// </summary>
Expand All @@ -1053,4 +1193,3 @@ public override string ToString()
}
}
}