look_and_tell_test.go

package strings

import (
	"testing"
)

/*
TestFindDuplicate tests solution(s) with the following signature and problem description:

	func LookAndTell(depth int) []string

Given a depth, return the output of look and tell an algorithm where each line reads the
last line. For example "1" is read as "11" (one one), and "11" is read as "21" (two ones).
*/
func TestFindDuplicate(t *testing.T) {
	tests := []struct {
		depth    int
		lastLine string
	}{
		{0, "-1"},
		{1, "1"},
		{2, "11"},
		{3, "21"},
		{4, "1211"},
		{5, "111221"},
		{6, "312211"},
		{7, "13112221"},
		{8, "1113213211"},
		{9, "31131211131221"},
		{10, "13211311123113112211"},
	}

	for i, test := range tests {
		tell := LookAndTell(test.depth)
		got := tell[len(tell)-1]
		if got != test.lastLine {
			t.Fatalf("Failed test case #%d. Want %q got %q", i, test.lastLine, got)
		}
	}
}