Function starts_with 

pub fn starts_with<T>(expected: T) -> StrMatcher<T>

Matches a string which starts with the given prefix.

Both the actual value and the expected prefix may be either a String or a string reference.

verify_that!("Some value", starts_with("Some"))?;  // Passes
verify_that!("Another value", starts_with("Some"))?;   // Fails
verify_that!("Some value", starts_with("value"))?;  // Fails
verify_that!("Some value".to_string(), starts_with("Some"))?;   // Passes
verify_that!("Some value", starts_with("Some".to_string()))?;   // Passes

See the StrMatcherConfigurator extension trait for more options on how the string is matched.