package kata_test

import (
	"testing"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"

	. "code.osinet.fr/fgm/codewars/kyu7/growth_of_a_population"
)

var _ = Describe("NbYear", func() {
	It("fixed tests", func() {
		Expect(NbYear(1500, 5, 100, 5000)).To(Equal(15))
		Expect(NbYear(1500000, 2.5, 10000, 2000000)).To(Equal(10))
		Expect(NbYear(1500000, 0.25, 1000, 2000000)).To(Equal(94))
		Expect(NbYear(1500000, 0.25, -1000, 2000000)).To(Equal(151))
	})
})

func TestPopN(t *testing.T) {
	checks := []struct {
		year, p0      int
		percent       float64
		aug, expected int
	}{
		{1, 1000, 2, 50, 1070},
		{2, 1000, 2, 50, 1141},
		{3, 1000, 2, 50, 1213},
	}

	for _, check := range checks {
		actual := PopN(check.p0, check.percent, check.aug, check.year)
		if actual != check.expected {
			t.Errorf("P0 %d + %0.2f + %d at year %d. Expected %d, got %d",
				check.p0, check.percent, check.aug, check.year, check.expected, actual)
		}
	}
}