func (s *TestSuite) TestBinlogPrevious(c *C) {
c1 := inst.BinlogCoordinates{LogFile: "mysql-bin.00017", LogPos: 104}
cres, err := c1.PreviousFileCoordinates()
c.Assert(err, IsNil)
c.Assert(c1.Type, Equals, cres.Type)
c.Assert(cres.LogFile, Equals, "mysql-bin.00016")
c2 := inst.BinlogCoordinates{LogFile: "mysql-bin.00100", LogPos: 104}
cres, err = c2.PreviousFileCoordinates()
c.Assert(err, IsNil)
c.Assert(c1.Type, Equals, cres.Type)
c.Assert(cres.LogFile, Equals, "mysql-bin.00099")
c3 := inst.BinlogCoordinates{LogFile: "mysql.00.prod.com.00100", LogPos: 104}
cres, err = c3.PreviousFileCoordinates()
c.Assert(err, IsNil)
c.Assert(c1.Type, Equals, cres.Type)
c.Assert(cres.LogFile, Equals, "mysql.00.prod.com.00099")
c4 := inst.BinlogCoordinates{LogFile: "mysql.00.prod.com.00000", LogPos: 104}
_, err = c4.PreviousFileCoordinates()
c.Assert(err, Not(IsNil))
}
