sorting_room_test.go

package sorting

import "testing"

func TestDescribeNumber(t *testing.T) {
	tests := []struct {
		description string
		input       float64
		want        string
	}{
		{
			description: "Describe 4.1",
			input:       4.1,
			want:        "This is the number 4.1",
		},
		{
			description: "Describe -3.2",
			input:       -3.2,
			want:        "This is the number -3.2",
		},
		{
			description: "Pads to single decimal place",
			input:       4.0,
			want:        "This is the number 4.0",
		},
		{
			description: "Truncates to single decimal place",
			input:       7.11,
			want:        "This is the number 7.1",
		},
	}
	for _, test := range tests {
		t.Run(test.description, func(t *testing.T) {
			if got := DescribeNumber(test.input); got != test.want {
				t.Errorf("DescribeNumber(%v) = %v; want %v", test.input, got, test.want)
			}
		})
	}
}

type testNumberBox struct {
	n int
}

func (nb testNumberBox) Number() int {
	return nb.n
}

func TestDescribeNumberBox(t *testing.T) {
	tests := []struct {
		description string
		input       NumberBox
		want        string
	}{
		{
			description: "Describe NumberBox with 4",
			input:       testNumberBox{4},
			want:        "This is a box containing the number 4.0",
		},
		{
			description: "Describe NumberBox with -3",
			input:       testNumberBox{-3},
			want:        "This is a box containing the number -3.0",
		},
	}
	for _, test := range tests {
		t.Run(test.description, func(t *testing.T) {
			if got := DescribeNumberBox(test.input); got != test.want {
				t.Errorf("DescribeNumberBox(%v) = %v; want %v", test.input, got, test.want)
			}
		})
	}
}

type differentFancyNumber struct {
	num string
}

func (i differentFancyNumber) Value() string {
	return i.num
}

func TestExtractFancyNumber(t *testing.T) {
	tests := []struct {
		description string
		input       FancyNumberBox
		want        int
	}{
		{
			description: "Extract fancy number 11",
			input:       FancyNumber{"11"},
			want:        11,
		},
		{
			description: "Extract fancy number 0",
			input:       FancyNumber{"0"},
			want:        0,
		},
		{
			description: "Extract a differentFancyNumber returns 0",
			input:       differentFancyNumber{"4"},
			want:        0,
		},
		{
			description: "Extract an invalid fancy number returns 0",
			input:       FancyNumber{"two"},
			want:        0,
		},
	}
	for _, test := range tests {
		t.Run(test.description, func(t *testing.T) {
			if got := ExtractFancyNumber(test.input); got != test.want {
				t.Errorf("ExtractFancyNumber(%v) = %v; want %v", test.input, got, test.want)
			}
		})
	}
}

func TestDescribeFancyNumberBox(t *testing.T) {
	tests := []struct {
		description string
		input       FancyNumberBox
		want        string
	}{
		{
			description: "Describe fancy number 12",
			input:       FancyNumber{"12"},
			want:        "This is a fancy box containing the number 12.0",
		},
		{
			description: "Describe fancy number 0",
			input:       FancyNumber{"0"},
			want:        "This is a fancy box containing the number 0.0",
		},
		{
			description: "Describe a different fancy number",
			input:       differentFancyNumber{"three"},
			want:        "This is a fancy box containing the number 0.0",
		},
		{
			description: "Describe a valid different fancy number",
			input:       differentFancyNumber{"4"},
			want:        "This is a fancy box containing the number 0.0",
		},
	}
	for _, test := range tests {
		t.Run(test.description, func(t *testing.T) {
			if got := DescribeFancyNumberBox(test.input); got != test.want {
				t.Errorf("DescribeFancyNumberBox(%v) = %v; want %v", test.input, got, test.want)
			}
		})
	}
}

func TestDescribeAnything(t *testing.T) {
	tests := []struct {
		description string
		input       interface{}
		want        string
	}{
		{
			description: "Describe 7.2",
			input:       7.2,
			want:        "This is the number 7.2",
		},
		{
			description: "Describe 42",
			input:       42,
			want:        "This is the number 42.0",
		},
		{
			description: "Describe NumberBox with 16",
			input:       testNumberBox{16},
			want:        "This is a box containing the number 16.0",
		},
		{
			description: "Describe FancyNumber with 16",
			input:       FancyNumber{"16"},
			want:        "This is a fancy box containing the number 16.0",
		},
		{
			description: "Describe a different FancyNumberBox",
			input:       differentFancyNumber{"ten"},
			want:        "This is a fancy box containing the number 0.0",
		},
		{
			description: "Something unknown is labelled return to sender",
			input:       "something we did not anticipate",
			want:        "Return to sender",
		},
	}
	for _, test := range tests {
		t.Run(test.description, func(t *testing.T) {
			if got := DescribeAnything(test.input); got != test.want {
				t.Errorf("DescribeAnything(%v) = %v; want %v", test.input, got, test.want)
			}
		})
	}
}