public void WithUsings()
{
var actual1 = new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings(new[] { "A", "B" }).Usings;
Assert.True(actual1.SequenceEqual(new[] { "A", "B" }));
var actual2 = new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings(Enumerable.Repeat("A", 1)).Usings;
Assert.True(actual2.SequenceEqual(Enumerable.Repeat("A", 1)));
Assert.Equal(0, new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings("A", "B").WithUsings(null).Usings.Count());
Assert.Equal(0, new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings("A", "B").WithUsings((string[])null).Usings.Count());
new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings(new string[] { null }).VerifyErrors(
// error CS7088: Invalid 'Usings' value: 'null'.
Diagnostic(ErrorCode.ERR_BadCompilationOptionValue).WithArguments("Usings", "null"));
new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings(new string[] { "" }).VerifyErrors(
// error CS7088: Invalid 'Usings' value: ''.
Diagnostic(ErrorCode.ERR_BadCompilationOptionValue).WithArguments("Usings", ""));
new CSharpCompilationOptions(OutputKind.ConsoleApplication).WithUsings(new string[] { "blah\0foo" }).VerifyErrors(
// error CS7088: Invalid 'Usings' value: 'blah\0foo'.
Diagnostic(ErrorCode.ERR_BadCompilationOptionValue).WithArguments("Usings", "blah\0foo"));
}
