gno.land/p/moul/kit/num/v0⧉

1package num23import (4	"strconv"5	"testing"67	"gno.land/p/nt/uassert/v0"8)910const minInt64 = -92233720368547758081112func TestDec(t *testing.T) {13	cases := []struct {14		name     string15		v        int6416		decimals int17		want     string18	}{19		{"whole", 2000000, 6, "2"},20		{"trimmed", 1234500, 6, "1.2345"},21		{"full", 1234567, 6, "1.234567"},22		{"zero", 0, 6, "0"},23		{"sub-unit", 100, 6, "0.0001"},24		{"smallest unit", 1, 6, "0.000001"},25		{"no decimals", 42, 0, "42"},26		{"negative whole", -2000000, 6, "-2"},27		{"negative fraction", -1500000, 6, "-1.5"},28		{"negative sub-unit", -100, 6, "-0.0001"},29		{"negative smallest unit", -1, 6, "-0.000001"},30		{"two decimals", 1234, 2, "12.34"},31		{"int64 max", 9223372036854775807, 6, "9223372036854.775807"},32		{"int64 min", minInt64, 6, "-9223372036854.775808"},33	}34	for _, tc := range cases {35		t.Run(tc.name, func(t *testing.T) {36			uassert.Equal(t, tc.want, Dec(tc.v, tc.decimals))37		})38	}39}4041func TestDecFixedKeepsWidth(t *testing.T) {42	cases := []struct {43		v    int6444		want string45	}{46		{2000000, "2.000000"},47		{1234500, "1.234500"},48		{0, "0.000000"},49		{-1, "-0.000001"},50	}51	for _, tc := range cases {52		uassert.Equal(t, tc.want, DecFixed(tc.v, 6))53	}54}5556// TestEveryDecimalStringParsesBack is the invariant the hand-rolled copies57// break: whatever comes out must be a number again. "-1." and "0.999" for a58// negative input both fail here, which is what the two live implementations59// return.60func TestEveryDecimalStringParsesBack(t *testing.T) {61	values := []int64{62		0, 1, -1, 100, -100, 999999, -999999, 1000000, -1000000,63		1234567, -1234567, 9223372036854775807, minInt64,64	}65	for _, v := range values {66		for _, fixed := range []bool{false, true} {67			got := dec(v, 6, fixed)68			f, err := strconv.ParseFloat(got, 64)69			if err != nil {70				t.Errorf("dec(%d, 6, %t) = %q, not a number: %v", v, fixed, got, err)71				continue72			}73			if (v < 0) != (f < 0) && f != 0 {74				t.Errorf("dec(%d, 6, %t) = %q, sign flipped", v, fixed, got)75			}76		}77	}78}7980// TestMagnitudeSurvivesTheInt64Minimum pins the one input that makes the81// obvious implementations fail. `-v` on the minimum is the minimum again, so a82// `if v < 0 { v = -v }` keeps it negative and a recursive `"-" + f(-v)` never83// terminates. A mainnet realm does the second.84func TestMagnitudeSurvivesTheInt64Minimum(t *testing.T) {85	neg, m := mag(minInt64)86	uassert.True(t, neg)87	uassert.Equal(t, "9223372036854775808", strconv.FormatUint(m, 10))88}8990func TestGNOT(t *testing.T) {91	uassert.Equal(t, "1.234567", GNOT(1234567))92	uassert.Equal(t, "1.234567 GNOT", GNOTf(1234567))93	uassert.Equal(t, "0 GNOT", GNOTf(0))94	uassert.Equal(t, "-1.5 GNOT", GNOTf(-1500000))95}9697func TestPct(t *testing.T) {98	uassert.Equal(t, "12.34%", Pct(1234))99	uassert.Equal(t, "1%", Pct(100))100	uassert.Equal(t, "0.01%", Pct(1))101	uassert.Equal(t, "0%", Pct(0))102	uassert.Equal(t, "-12.34%", Pct(-1234))103}104105func TestPad(t *testing.T) {106	cases := []struct {107		v     int64108		width int109		want  string110	}{111		{7, 3, "007"},112		{123, 3, "123"},113		{1234, 3, "1234"},114		{0, 2, "00"},115		{7, 0, "7"},116		{-7, 3, "-007"},117		{minInt64, 3, "-9223372036854775808"},118	}119	for _, tc := range cases {120		uassert.Equal(t, tc.want, Pad(tc.v, tc.width))121	}122}123124func TestDecRejectsAnImpossibleScale(cur realm, t *testing.T) {125	msg := "num: decimals out of range [0, 19]"126	uassert.PanicsWithMessage(t, cur, msg, func() { Dec(1, -1) })127	uassert.PanicsWithMessage(t, cur, msg, func() { Dec(1, 20) })128	uassert.NotPanics(t, cur, func() { Dec(1, 0) })129	uassert.NotPanics(t, cur, func() { Dec(1, 19) })130}131