added tests for one-sided event matching
added tests for one-sided event matching

ruohoruotsi/librosa,r9y9/librosa,r9y9/librosa,stefan-balke/librosa,ruohoruotsi/librosa,carlthome/librosa,carlthome/librosa,r9y9/librosa,carlthome/librosa,ruohoruotsi/librosa,stefan-balke/librosa,stefan-balke/librosa