improved coverage on freq ticker tests again
improved coverage on freq ticker tests again

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