package functions

import (
	"testing"
	"fmt"
)

// Test fibonacci function

func TestFibonacci(t *testing.T) {
	var sequence = [4]int{1, 3, 5, 9}
	var values = [4]int{1, 2, 5, 34}
	for i := 0; i < len(sequence); i++ {
		var seq, want = sequence[i], values[i]
		outcome, error := MyFibonacci(seq)
		if error != nil {
			t.Errorf("Error trying to Fibonacci %d: %s", seq, error)
		}
		if outcome != want {
			t.Errorf("Invalid outcome: Fibonacci sequence %d should be %d, got %d",
				seq, want, outcome)
		}
	}
}

func TestFibBadNumber(t *testing.T) {
	outcome,error := MyFibonacci(-4)
	if error == nil {
		t.Errorf("This should be an error, not a %d",outcome)
	}
}

func TestSums(t *testing.T) {
	var tests = []struct{
		a, b int
		want int
	} {
		{1, 2, 3},
		{5, 3, 8},
		{9, 4, 13},
	}

	for _, tt := range tests {
		testname := fmt.Sprintf("%d+%d",tt.a, tt.b)
		t.Run(testname, func(t *testing.T) {
			result := sum(tt.a, tt.b)
			if result != tt.want {
				t.Errorf("Expected %d, got %d", tt.want,result)
			}
		})
	}
}