NewConsoleDriver initializes and returns a new console driver with output to given file.

NewConsoleDriverWithKiller initializes and returns a new console driver with output file Killer function will be called on fatal errors.

NullDriver does nothing, ignores all output and doesn't die on errors.

ConsoleDriver outputs test result to the given stdout/stderr descriptors.

Driver for testing, manages test flow and controls output.

Testable is optionally implemented by clients that support self testing.