Why this unit test failed etc?

Question

I have this method :

private bool MatchedTarget(string TargetName, Paragraph paragraph, string text)
{
    bool targetFound = false;
    if (IsHeader(paragraph)) {
        text.ToLower().Trim().Contains(TargetName.ToLower().Trim());
        targetFound = true;
    }
    return targetFound;
}

And I have a unit test but it returned me Failed where it is supposed to return Passed.

 

Please let me know where I had gone wrong

[Test]
public void LowerCaseShouldReturnTrue()
{
    ProcessingDocx processor = new ProcessingDocx(null);
    Paragraph para = CreateParagraphStyle("Normal");

    System.Type type = typeof(ProcessingDocx);
    bool result = (bool)type.GetMethod("MatchedTarget", BindingFlags.NonPublic | BindingFlags.Instance)
                            .Invoke(processor, new object[] { "Annex A",  para, "annex a" });

    Assert.True(result);
}