Golang Testify: require vs assert

Library Code

assert is a boolean test. An example implementation is following:

package assert
func Error(t TestingT, err error, msgAndArgs ...interface{}) bool {
 if err == nil {
  if h, ok := t.(tHelper); ok {
   h.Helper()
  }
  // Prints error trace, test details and error message
  return Fail(t, "An error is expected but got nil.", msgAndArgs...)
 }
return true
}