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fbuf_test.go
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fbuf_test.go
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package rbuf
import (
"io"
"testing"
cv "github.com/glycerine/goconvey/convey"
)
func TestFloatBufReadWrite(t *testing.T) {
b := NewFloat64RingBuf(5)
data := []float64{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
cv.Convey("Given a Float64RingBuf of size 5", t, func() {
cv.Convey("Write() and ReadFloat64() should put and get floats", func() {
b.Reset()
n, err := b.Write(data[:5])
cv.So(n, cv.ShouldEqual, 5)
cv.So(err, cv.ShouldEqual, nil)
cv.So(b.Readable, cv.ShouldEqual, 5)
cv.So(b.Values(), cv.ShouldResemble, data[:5])
sink := make([]float64, 3)
n, err = b.ReadFloat64(sink)
cv.So(n, cv.ShouldEqual, 3)
cv.So(b.Values(), cv.ShouldResemble, data[3:5])
cv.So(sink, cv.ShouldResemble, data[:3])
})
cv.Convey("Write() more than 5 items should give back ErrShortWrite", func() {
b.Reset()
cv.So(b.Readable, cv.ShouldEqual, 0)
n, err := b.Write(data[:10])
cv.So(n, cv.ShouldEqual, 5)
cv.So(err, cv.ShouldEqual, io.ErrShortWrite)
cv.So(b.Readable, cv.ShouldEqual, 5)
cv.So(b.Values(), cv.ShouldResemble, data[:5])
sink := make([]float64, 3)
n, err = b.ReadFloat64(sink)
cv.So(n, cv.ShouldEqual, 3)
cv.So(b.Values(), cv.ShouldResemble, data[3:5])
cv.So(sink, cv.ShouldResemble, data[:3])
})
cv.Convey("WriteAndMaybeOverwriteOldestData() should auto advance", func() {
b.Reset()
n, err := b.WriteAndMaybeOverwriteOldestData(data[:5])
cv.So(err, cv.ShouldEqual, nil)
cv.So(n, cv.ShouldEqual, 5)
cv.So(b.Values(), cv.ShouldResemble, data[:5])
n, err = b.WriteAndMaybeOverwriteOldestData(data[5:7])
cv.So(n, cv.ShouldEqual, 2)
cv.So(b.Values(), cv.ShouldResemble, data[2:7])
n, err = b.WriteAndMaybeOverwriteOldestData(data[0:9])
cv.So(err, cv.ShouldEqual, nil)
cv.So(n, cv.ShouldEqual, 9)
cv.So(b.Values(), cv.ShouldResemble, data[4:9])
})
})
}