public void EnsureStartsWith_WithSentenceStringAndUnknownWord_ExpectsConcatenationAtStart() => Equal( WORD + SENTENCE, SENTENCE.EnsureStartsWith(WORD));
public void EnsureStartsWith_WithSentenceStringAndFirstWord_ExpectsSentenceString() => Equal( SENTENCE, SENTENCE.EnsureStartsWith(WORD_FIRST));
public void EnsureStartsWith_WithNullValue_Throws() => Throws <ArgumentNullException>(() => SENTENCE.EnsureStartsWith(NULL));