Update: test case

Author: openset

problems/2-keys-keyboard/2_keys_keyboard_test.go

@@ -9,6 +9,10 @@ type caseType struct {
 
 func TestMinSteps(t *testing.T) {
 	tests := [...]caseType{
+		{
+			input:    1,
+			expected: 0,
+		},
 		{
 			input:    3,
 			expected: 3,