package generics

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestPtr(t *testing.T) {
	num := new(int)
	*num = 8

	require.Equal(t, num, *Ptr(num))
}

func TestVal(t *testing.T) {
	num := new(int)
	*num = 8

	tests := map[string]struct {
		input          *int
		expectedResult int
	}{
		"non-nil pointer": {
			input:          num,
			expectedResult: *num,
		},
		"nil pointer": {},
	}

	for name, tc := range tests {
		name, tc := name, tc
		t.Run(name, func(t *testing.T) {
			require.Equal(t, tc.expectedResult, Val(tc.input))
		})
	}
}

func TestFallback(t *testing.T) {
	num := new(int)
	*num = 8
	fallback := 9

	tests := map[string]struct {
		input          *int
		expectedResult int
	}{
		"non-nil pointer": {
			input:          num,
			expectedResult: *num,
		},
		"nil pointer": {
			expectedResult: fallback,
		},
	}

	for name, tc := range tests {
		name, tc := name, tc
		t.Run(name, func(t *testing.T) {
			require.Equal(t, tc.expectedResult, Fallback(tc.input, tc.expectedResult))
		})
	}
}