utils/count_test.go at master · msumera/utils · GitHub

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package utils

import "testing"

func TestCount(t *testing.T) {
	type args[T string] struct {
		list []T
		fn   func(T) bool
	}
	type testCase[T string] struct {
		name string
		args args[T]
		want int
	}
	tests := []testCase[string]{
		{
			name: "empty-true",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: make([]string, 0), fn: fnTrue},
			want: 0,
		},
		{
			name: "empty-false",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: make([]string, 0), fn: fnFalse},
			want: 0,
		},
		{
			name: "empty-len2",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: make([]string, 0), fn: fnLength2},
			want: 0,
		},
		{
			name: "one-true",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"x"}, fn: fnTrue},
			want: 1,
		},
		{
			name: "one-false",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"x"}, fn: fnFalse},
			want: 0,
		},
		{
			name: "one-len2-true",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xd"}, fn: fnLength2},
			want: 1,
		},
		{
			name: "one-len2-false",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xdd"}, fn: fnLength2},
			want: 0,
		},
		{
			name: "two-true",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xd", "dx"}, fn: fnTrue},
			want: 2,
		},
		{
			name: "two-false",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xd", "dx"}, fn: fnFalse},
			want: 0,
		},
		{
			name: "two-len2-0",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"x", "d"}, fn: fnLength2},
			want: 0,
		},
		{
			name: "two-len2-1",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xd", "d"}, fn: fnLength2},
			want: 1,
		},
		{
			name: "two-len2-2",
			args: struct {
				list []string
				fn   func(string) bool
			}{list: []string{"xd", "dx"}, fn: fnLength2},
			want: 2,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := Count(tt.args.list, tt.args.fn); got != tt.want {
				t.Errorf("Count() = %v, want %v", got, tt.want)
			}
		})
	}
}