Migrate `babel-code-frame` tests to use `expect` (#7485)
Migrate `babel-code-frame` tests to use `expect` (#7485)

* Replace `assert.equal` calls with appropriate `expect` calls
* Work-in-progress: Currently targeting only `babel-code-frame` tests
hulkish/babel,jridgewell/babel,hulkish/babel,hulkish/babel,samwgoldman/babel,Skillupco/babel,hzoo/babel,chicoxyzzy/babel,Skillupco/babel,kaicataldo/babel,kellyselden/babel,chicoxyzzy/babel,hulkish/babel,kaicataldo/babel,jridgewell/babel,kaicataldo/babel,babel/babel,samwgoldman/babel,babel/babel,hzoo/babel,chicoxyzzy/babel,vadzim/babel,Skillupco/babel,samwgoldman/babel,existentialism/babel,hzoo/babel,jridgewell/babel,vadzim/babel,Skillupco/babel,existentialism/babel,jridgewell/babel,babel/babel,kellyselden/babel,kellyselden/babel,kellyselden/babel,hzoo/babel,babel/babel,chicoxyzzy/babel,kaicataldo/babel,existentialism/babel