util_test.go

package base

import (
	. "github.com/smartystreets/goconvey/convey"
	"testing"
)

func TestClassDistributionAfterSplit(t *testing.T) {
	Convey("Given the PlayTennis dataset", t, func() {
		inst, err := ParseCSVToInstances("../examples/datasets/tennis.csv", true)
		So(err, ShouldEqual, nil)

		Convey("Splitting on Sunny should give the right result...", func() {
			result := GetClassDistributionAfterSplit(inst, inst.AllAttributes()[0])
			So(result["sunny"]["no"], ShouldEqual, 3)
			So(result["sunny"]["yes"], ShouldEqual, 2)
			So(result["overcast"]["yes"], ShouldEqual, 4)
			So(result["rainy"]["yes"], ShouldEqual, 3)
			So(result["rainy"]["no"], ShouldEqual, 2)
		})

	})
}

func TestPackAndUnpack(t *testing.T) {
	Convey("Given some uint64", t, func() {
		x := uint64(0xDEADBEEF)
		Convey("When the integer is packed", func() {
			packed := PackU64ToBytes(x)
			Convey("And then unpacked", func() {
				unpacked := UnpackBytesToU64(packed)
				Convey("The unpacked version should be the same", func() {
					So(x, ShouldEqual, unpacked)
				})
			})
		})
	})

	Convey("Given another uint64", t, func() {
		x := uint64(1)
		Convey("When the integer is packed", func() {
			packed := PackU64ToBytes(x)
			Convey("And then unpacked", func() {
				unpacked := UnpackBytesToU64(packed)
				Convey("The unpacked version should be the same", func() {
					So(x, ShouldEqual, unpacked)
				})
			})
		})
	})
}

func TestPackAndUnpackFloat(t *testing.T) {
	Convey("Given some float", t, func() {
		x := 1.2011
		Convey("When the float gets packed", func() {
			packed := PackFloatToBytes(x)
			Convey("And then unpacked", func() {
				unpacked := UnpackBytesToFloat(packed)
				Convey("The unpacked version should be the same", func() {
					So(unpacked, ShouldEqual, x)
				})
			})
		})
	})
}

func TestStrictlyCompatable(t *testing.T) {
	Convey("Given two datasets...", t, func() {
		Convey("Given two identical datasets", func() {
			// Violates the requirement that both CategoricalAttributes
			// must have values in the same order
			d1, err := ParseCSVToInstances("../examples/datasets/exam.csv", true)
			So(err, ShouldEqual, nil)
			d2, err := ParseCSVToInstances("../examples/datasets/exams.csv", true)
			So(err, ShouldEqual, nil)
			So(CheckStrictlyCompatible(d1, d2), ShouldEqual, true)
		})
		Convey("Given two identical datasets (apart from sorting)", func() {
			// Violates the requirement that both CategoricalAttributes
			// must have values in the same order
			d1, err := ParseCSVToInstances("../examples/datasets/iris_sorted_asc.csv", true)
			So(err, ShouldEqual, nil)
			d2, err := ParseCSVToInstances("../examples/datasets/iris_sorted_desc.csv", true)
			So(err, ShouldEqual, nil)
			So(CheckStrictlyCompatible(d1, d2), ShouldEqual, false)
		})
		Convey("Given two different datasets...", func() {
			// Violates verything
			d1, err := ParseCSVToInstances("../examples/datasets/tennis.csv", true)
			So(err, ShouldEqual, nil)
			d2, err := ParseCSVToInstances("../examples/datasets/iris_sorted_desc.csv", true)
			So(err, ShouldEqual, nil)
			So(CheckStrictlyCompatible(d1, d2), ShouldEqual, false)
		})
	})
}

func TestCategoricalEquality(t *testing.T) {
	Convey("Given two outwardly identical class Attributes...", t, func() {
		d1, err := ParseCSVToInstances("../examples/datasets/iris_sorted_asc.csv", true)
		So(err, ShouldEqual, nil)
		d2, err := ParseCSVToInstances("../examples/datasets/iris_sorted_desc.csv", true)
		So(err, ShouldEqual, nil)
		c1 := d1.AllClassAttributes()[0]
		c2 := d2.AllClassAttributes()[0]
		So(c1.GetName(), ShouldEqual, c2.GetName())
		So(c1.Equals(c2), ShouldBeFalse)
		So(c2.Equals(c1), ShouldBeFalse) // Violates the fact that Attributes must appear in the same order
	})
}