Description
TestContext.WriteLine throwing System.FormatException when json string is passed.
Method Signature:
public abstract void WriteLine(string format, params object[] args);
Steps to reproduce
- Create a unit test project, add MSTest.TestFramework dll and execute the below test method
[TestClass]
public class UnitTest1
{
private TestContext testContextInstance;
/// <summary>
///Gets or sets the test context which provides
///information about and functionality for the current test run.
///</summary>
public TestContext TestContext
{
get
{
return testContextInstance;
}
set
{
testContextInstance = value;
}
}
[TestMethod]
public void TestMethod1()
{
var msg = "{curly braces}";
//Debug.WriteLine(msg);
TestContext.WriteLine(msg);
}
}
Expected behavior
Test sholuld pass, user should be able to write the json in output.
Actual behavior
Test is failing with System.FormatException.
RCA :
This is happening because string.format is used for implementing this API and it expects format which placeholders {0}, {1}, etc. and corresponding arguments.
But when json string is passed, it just throws System.FormatException as string is present inside curly braces.
Workaround:
As a workaround, user has to add one extra curly brace for every curly brace present in string.
string str = "{{mystring}}";
Fix :
Do not use string.format api when count of arguments are null in implementation of API
public abstract void WriteLine(string format, params object[] args);
Description
Method Signature:
public abstract void WriteLine(string format, params object[] args);Steps to reproduce
Expected behavior
Test sholuld pass, user should be able to write the json in output.
Actual behavior
Test is failing with System.FormatException.
RCA :
This is happening because string.format is used for implementing this API and it expects format which placeholders {0}, {1}, etc. and corresponding arguments.
But when json string is passed, it just throws System.FormatException as string is present inside curly braces.
Workaround:
As a workaround, user has to add one extra curly brace for every curly brace present in string.
string str = "{{mystring}}";Fix :
Do not use string.format api when count of arguments are null in implementation of API
public abstract void WriteLine(string format, params object[] args);