public void SubstringPreceding_WithSentenceStringAndFirstWord_ExpectsFirstWord() => Equal( WORD_FIRST, SENTENCE.SubstringPreceding(WORD_FIRST));
public void SubstringPreceding_WithSentenceStringAndEmptyString_ExpectsSentenceString() => Equal( SENTENCE, SENTENCE.SubstringPreceding(EMPTY));
public void SubstringPreceding_WithSentenceStringAndLastWord_ExpectsSentenceString() => Equal( SENTENCE, SENTENCE.SubstringPreceding(WORD_LAST));
public void SubstringPreceding_WithSentenceStringAndUnknownWord_Throws() => Throws <ArgumentOutOfRangeException>(() => SENTENCE.SubstringPreceding(WORD));