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amortization_test.go
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package gofinancial
import (
"bytes"
"errors"
"fmt"
"io"
"strings"
"testing"
"time"
"github.com/shopspring/decimal"
"github.com/go-echarts/go-echarts/v2/charts"
"github.com/razorpay/go-financial/enums/interesttype"
"github.com/razorpay/go-financial/enums/paymentperiod"
"github.com/smartystreets/assertions"
"github.com/razorpay/go-financial/enums/frequency"
)
const (
precision = 0.0000001
)
func Test_amortization_GenerateTable(t *testing.T) {
type fields struct {
Config *Config
}
tests := []struct {
name string
fields fields
want []Row
wantErr bool
}{
{
name: "monthly table with rounding, reducing interest",
fields: fields{Config: getConfigDto(frequency.MONTHLY, true, interesttype.REDUCING, decimal.NewFromInt(1000000), decimal.NewFromInt(2400), 0)},
want: getRowsWithRounding(t),
wantErr: false,
},
{
name: "monthly table without rounding, reducing interest",
fields: fields{Config: getConfigDto(frequency.MONTHLY, false, interesttype.REDUCING, decimal.NewFromInt(1000000), decimal.NewFromInt(2400), 0)},
want: getRowsWithoutRounding(t),
wantErr: false,
},
{
name: "daily table, flat interest, with rounding",
fields: fields{
Config: &Config{
StartDate: time.Date(2020, 4, 15, 0, 0, 0, 0, time.UTC),
EndDate: time.Date(2020, 5, 14, 0, 0, 0, 0, time.UTC),
Frequency: frequency.DAILY,
AmountBorrowed: decimal.NewFromInt(1000000),
InterestType: interesttype.FLAT,
Interest: decimal.NewFromInt(7300),
PaymentPeriod: paymentperiod.ENDING,
EnableRounding: true,
RoundingPlaces: 0,
},
},
want: getRowsFlatWithRounding(t),
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
a, err := NewAmortization(tt.fields.Config)
if err != nil {
t.Errorf("NewAmortization() call failed. error = %v", err)
}
got, err := a.GenerateTable()
if (err != nil) != tt.wantErr {
t.Errorf("GenerateTable() error = %v, wantErr %v", err, tt.wantErr)
return
}
if len(got) != len(tt.want) {
t.Fatalf("length mismatch of rows generate, want=%v, got=%v", len(tt.want), len(got))
}
for idx := range got {
if err := verifyRow(t, got[idx], tt.want[idx]); err != nil {
t.Fatal(err)
}
}
if err := principalCheck(t, got, tt.fields.Config.AmountBorrowed); err != nil {
t.Fatal(err)
}
})
}
}
func principalCheck(t *testing.T, rows []Row, actualPrincipal decimal.Decimal) error {
expectedPrincipal := decimal.Zero
dPrecision := decimal.NewFromFloat(precision)
for _, row := range rows {
expectedPrincipal = expectedPrincipal.Add(row.Principal)
}
if err := isAlmostEqual(expectedPrincipal, actualPrincipal, dPrecision); err != nil {
return fmt.Errorf("error:%v, principalCheck failed. expected:%v, got:%v", err.Error(), expectedPrincipal, actualPrincipal)
}
return nil
}
func verifyRow(t *testing.T, actual Row, expected Row) error {
dPrecision := decimal.NewFromFloat(precision)
if err := isAlmostEqual(actual.Principal, expected.Principal, dPrecision); err != nil {
return fmt.Errorf("error:%v, principal values are not almost equal. expected:%v, got:%v", err.Error(), expected.Principal, actual.Principal)
}
if err := isAlmostEqual(actual.Interest, expected.Interest, dPrecision); err != nil {
return fmt.Errorf("error:%v, interest values are not almost equal. expected:%v, got:%v", err.Error(), expected.Interest, actual.Interest)
}
if err := isAlmostEqual(actual.Payment, expected.Payment, dPrecision); err != nil {
return fmt.Errorf("error:%v, payment values are not equal. expected:%v, got:%v", err.Error(), expected.Payment, actual.Payment)
}
if err := isAlmostEqual(actual.Principal.Add(actual.Interest), actual.Payment, dPrecision); err != nil {
return fmt.Errorf("error:%v, the calculation is not correct. %v(Interest) + %v(Principal) != %v(Payment)", err.Error(), actual.Interest, actual.Principal, actual.Payment)
}
if !actual.StartDate.Equal(expected.StartDate) {
return fmt.Errorf("start date value mismatch. Expected startDate:%v, endDate:%v, got startDate:%v endDate:%v", expected.StartDate, expected.EndDate, actual.StartDate, actual.EndDate)
}
if !actual.EndDate.Equal(expected.EndDate) {
return fmt.Errorf("end date value mismatch. Expected startDate:%v, endDate:%v, got startDate:%v endDate:%v", expected.StartDate, expected.EndDate, actual.StartDate, actual.EndDate)
}
return nil
}
func isAlmostEqual(first decimal.Decimal, second decimal.Decimal, tolerance decimal.Decimal) error {
diff := first.Abs().Sub(second.Abs())
if diff.Abs().LessThanOrEqual(tolerance) {
return nil
} else {
return fmt.Errorf("%s is not equal to %s with %s tolerance", first.String(), second.String(), tolerance.String())
}
}
func getRowsWithRounding(t *testing.T) []Row {
return []Row{
{Period: 1, StartDate: timeParseUtil(t, "2020-04-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-20000), Principal: decimal.NewFromInt(-32871)},
{Period: 2, StartDate: timeParseUtil(t, "2020-05-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-06-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-19342), Principal: decimal.NewFromInt(-33529)},
{Period: 3, StartDate: timeParseUtil(t, "2020-06-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-07-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-18672), Principal: decimal.NewFromInt(-34199)},
{Period: 4, StartDate: timeParseUtil(t, "2020-07-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-08-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-17988), Principal: decimal.NewFromInt(-34883)},
{Period: 5, StartDate: timeParseUtil(t, "2020-08-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-09-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-17290), Principal: decimal.NewFromInt(-35581)},
{Period: 6, StartDate: timeParseUtil(t, "2020-09-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-10-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-16579), Principal: decimal.NewFromInt(-36292)},
{Period: 7, StartDate: timeParseUtil(t, "2020-10-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-11-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-15853), Principal: decimal.NewFromInt(-37018)},
{Period: 8, StartDate: timeParseUtil(t, "2020-11-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-12-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-15112), Principal: decimal.NewFromInt(-37759)},
{Period: 9, StartDate: timeParseUtil(t, "2020-12-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-01-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-14357), Principal: decimal.NewFromInt(-38514)},
{Period: 10, StartDate: timeParseUtil(t, "2021-01-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-02-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-13587), Principal: decimal.NewFromInt(-39284)},
{Period: 11, StartDate: timeParseUtil(t, "2021-02-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-03-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-12801), Principal: decimal.NewFromInt(-40070)},
{Period: 12, StartDate: timeParseUtil(t, "2021-03-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-04-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-12000), Principal: decimal.NewFromInt(-40871)},
{Period: 13, StartDate: timeParseUtil(t, "2021-04-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-05-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-11183), Principal: decimal.NewFromInt(-41688)},
{Period: 14, StartDate: timeParseUtil(t, "2021-05-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-06-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-10349), Principal: decimal.NewFromInt(-42522)},
{Period: 15, StartDate: timeParseUtil(t, "2021-06-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-07-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-9498), Principal: decimal.NewFromInt(-43373)},
{Period: 16, StartDate: timeParseUtil(t, "2021-07-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-08-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-8631), Principal: decimal.NewFromInt(-44240)},
{Period: 17, StartDate: timeParseUtil(t, "2021-08-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-09-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-7746), Principal: decimal.NewFromInt(-45125)},
{Period: 18, StartDate: timeParseUtil(t, "2021-09-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-10-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-6844), Principal: decimal.NewFromInt(-46027)},
{Period: 19, StartDate: timeParseUtil(t, "2021-10-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-11-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-5923), Principal: decimal.NewFromInt(-46948)},
{Period: 20, StartDate: timeParseUtil(t, "2021-11-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-12-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-4984), Principal: decimal.NewFromInt(-47887)},
{Period: 21, StartDate: timeParseUtil(t, "2021-12-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-01-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-4026), Principal: decimal.NewFromInt(-48845)},
{Period: 22, StartDate: timeParseUtil(t, "2022-01-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-02-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-3049), Principal: decimal.NewFromInt(-49822)},
{Period: 23, StartDate: timeParseUtil(t, "2022-02-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-03-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-2053), Principal: decimal.NewFromInt(-50818)},
{Period: 24, StartDate: timeParseUtil(t, "2022-03-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-04-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-52871), Interest: decimal.NewFromInt(-1037), Principal: decimal.NewFromInt(-51834)},
}
}
func getRowsWithoutRounding(t *testing.T) []Row {
return []Row{
{Period: 1, StartDate: timeParseUtil(t, "2020-04-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-20000), Principal: decimal.NewFromFloat(-32871.0972532498902312)},
{Period: 2, StartDate: timeParseUtil(t, "2020-05-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-06-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-19342.578054935002195376), Principal: decimal.NewFromFloat(-33528.519198314888035824)},
{Period: 3, StartDate: timeParseUtil(t, "2020-06-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-07-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-18672.00767096870443465952), Principal: decimal.NewFromFloat(-34199.08958228118579654048)},
{Period: 4, StartDate: timeParseUtil(t, "2020-07-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-08-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-17988.0258793230807187287104), Principal: decimal.NewFromFloat(-34883.0713739268095124712896)},
{Period: 5, StartDate: timeParseUtil(t, "2020-08-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-09-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-17290.364451844544528479284608), Principal: decimal.NewFromFloat(-35580.732801405345702720715392)},
{Period: 6, StartDate: timeParseUtil(t, "2020-09-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-10-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-16578.74979581643761442487030016), Principal: decimal.NewFromFloat(-36292.34745743345261677512969984)},
{Period: 7, StartDate: timeParseUtil(t, "2020-10-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-11-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-15852.9028466677685620893677061632), Principal: decimal.NewFromFloat(-37018.1944065821216691106322938368)},
{Period: 8, StartDate: timeParseUtil(t, "2020-11-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-12-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-15112.538958536126128707155060286464), Principal: decimal.NewFromFloat(-37758.558294713764102492844939713536)},
{Period: 9, StartDate: timeParseUtil(t, "2020-12-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-01-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-14357.36779264185084665729816149219328), Principal: decimal.NewFromFloat(-38513.72946060803938454270183850780672)},
{Period: 10, StartDate: timeParseUtil(t, "2021-01-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-02-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-13587.0932034296900589664441247220371456), Principal: decimal.NewFromFloat(-39284.0040498202001722335558752779628544)},
{Period: 11, StartDate: timeParseUtil(t, "2021-02-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-03-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-12801.413122433286068210836347996451544), Principal: decimal.NewFromFloat(-40069.684130816604162989163652003548456)},
{Period: 12, StartDate: timeParseUtil(t, "2021-03-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-04-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-12000.0194398169540166737114269063147136), Principal: decimal.NewFromFloat(-40871.0778134329362145262885730936852864)},
{Period: 13, StartDate: timeParseUtil(t, "2021-04-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-05-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-11182.5978835482952627753711936245024784), Principal: decimal.NewFromFloat(-41688.4993697015949684246288063754975216)},
{Period: 14, StartDate: timeParseUtil(t, "2021-05-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-06-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-10348.8278961542633824404736286669530112), Principal: decimal.NewFromFloat(-42522.2693570956268487595263713330469888)},
{Period: 15, StartDate: timeParseUtil(t, "2021-06-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-07-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-9498.38250901235076510121527630045892), Principal: decimal.NewFromFloat(-43372.71474423753946609878472369954108)},
{Period: 16, StartDate: timeParseUtil(t, "2021-07-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-08-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-8630.9282141276000286503368350763583296), Principal: decimal.NewFromFloat(-44240.1690391222902025496631649236416704)},
{Period: 17, StartDate: timeParseUtil(t, "2021-08-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-09-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-7746.1248333451542161399680112579030592), Principal: decimal.NewFromFloat(-45124.9724199047360150600319887420969408)},
{Period: 18, StartDate: timeParseUtil(t, "2021-09-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-10-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-6843.6253849470594789200162504430962464), Principal: decimal.NewFromFloat(-46027.4718683028307522799837495569037536)},
{Period: 19, StartDate: timeParseUtil(t, "2021-10-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-11-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-5923.0759475810028934822310372718967008), Principal: decimal.NewFromFloat(-46948.0213056688873377177689627281032992)},
{Period: 20, StartDate: timeParseUtil(t, "2021-11-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2021-12-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-4984.1155214676251636466267790572995088), Principal: decimal.NewFromFloat(-47886.9817317822650675533732209427004912)},
{Period: 21, StartDate: timeParseUtil(t, "2021-12-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-01-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-4026.375886831979834802588742948502578752), Principal: decimal.NewFromFloat(-48844.721366417910396397411257051497421248)},
{Period: 22, StartDate: timeParseUtil(t, "2022-01-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-02-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-3049.48145950362167128636221053738042453504), Principal: decimal.NewFromFloat(-49821.61579374626855991363778946261957546496)},
{Period: 23, StartDate: timeParseUtil(t, "2022-02-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-03-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.0972532498902312), Interest: decimal.NewFromFloat(-2053.0491436286962239537094100682861000977408), Principal: decimal.NewFromFloat(-50818.0481096211940072462905899317138999022592)},
{Period: 24, StartDate: timeParseUtil(t, "2022-03-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2022-04-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromFloat(-52871.097253249891181711353923018822531276476416), Interest: decimal.NewFromFloat(-1036.688181436272405139256412039524490291695616), Principal: decimal.NewFromFloat(-51834.4090718136187765720975109792980409847808)},
}
}
func getRowsFlatWithRounding(t *testing.T) []Row {
return []Row{
{Period: 1, StartDate: timeParseUtil(t, "2020-04-15 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-15 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 2, StartDate: timeParseUtil(t, "2020-04-16 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-16 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 3, StartDate: timeParseUtil(t, "2020-04-17 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-17 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 4, StartDate: timeParseUtil(t, "2020-04-18 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-18 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 5, StartDate: timeParseUtil(t, "2020-04-19 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-19 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 6, StartDate: timeParseUtil(t, "2020-04-20 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-20 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 7, StartDate: timeParseUtil(t, "2020-04-21 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-21 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 8, StartDate: timeParseUtil(t, "2020-04-22 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-22 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 9, StartDate: timeParseUtil(t, "2020-04-23 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-23 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 10, StartDate: timeParseUtil(t, "2020-04-24 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-24 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 11, StartDate: timeParseUtil(t, "2020-04-25 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-25 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 12, StartDate: timeParseUtil(t, "2020-04-26 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-26 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 13, StartDate: timeParseUtil(t, "2020-04-27 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-27 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 14, StartDate: timeParseUtil(t, "2020-04-28 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-28 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 15, StartDate: timeParseUtil(t, "2020-04-29 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-29 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 16, StartDate: timeParseUtil(t, "2020-04-30 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-04-30 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 17, StartDate: timeParseUtil(t, "2020-05-01 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-01 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 18, StartDate: timeParseUtil(t, "2020-05-02 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-02 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 19, StartDate: timeParseUtil(t, "2020-05-03 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-03 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 20, StartDate: timeParseUtil(t, "2020-05-04 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-04 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 21, StartDate: timeParseUtil(t, "2020-05-05 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-05 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 22, StartDate: timeParseUtil(t, "2020-05-06 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-06 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 23, StartDate: timeParseUtil(t, "2020-05-07 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-07 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 24, StartDate: timeParseUtil(t, "2020-05-08 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-08 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 25, StartDate: timeParseUtil(t, "2020-05-09 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-09 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 26, StartDate: timeParseUtil(t, "2020-05-10 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-10 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 27, StartDate: timeParseUtil(t, "2020-05-11 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-11 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 28, StartDate: timeParseUtil(t, "2020-05-12 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-12 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 29, StartDate: timeParseUtil(t, "2020-05-13 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-13 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35333), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33333)},
{Period: 30, StartDate: timeParseUtil(t, "2020-05-14 00:00:00 +0000 UTC"), EndDate: timeParseUtil(t, "2020-05-14 23:59:59 +0000 UTC"), Payment: decimal.NewFromInt(-35343), Interest: decimal.NewFromInt(-2000), Principal: decimal.NewFromInt(-33343)},
}
}
func timeParseUtil(t *testing.T, input string) time.Time {
resultTime, err := time.Parse("2006-01-02 15:04:05 -0700 MST", input)
if err != nil {
t.Fatalf("invalid time format, %v", err)
}
return resultTime
}
func getConfigDto(frequency frequency.Type, round bool, interestType interesttype.Type, amount decimal.Decimal, interest decimal.Decimal, places int32) *Config {
return &Config{
StartDate: time.Date(2020, 4, 15, 0, 0, 0, 0, time.UTC),
EndDate: time.Date(2022, 4, 14, 0, 0, 0, 0, time.UTC),
Frequency: frequency,
AmountBorrowed: amount,
InterestType: interestType,
Interest: interest,
EnableRounding: round,
RoundingPlaces: places,
}
}
func TestPlotRows(t *testing.T) {
type args struct {
rows []Row
fileName string
}
tests := []struct {
name string
args args
wantErr bool
}{
{
"plot for loan schedule",
args{
rows: getRowsWithRounding(t),
fileName: "loan-schedule",
},
false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var err error
if err = PlotRows(tt.args.rows, tt.args.fileName); (err != nil) != tt.wantErr {
t.Errorf("PlotRows() error = %v, wantErr %v", err, tt.wantErr)
}
})
}
}
func TestRenderer(t *testing.T) {
type args struct {
bar *charts.Bar
}
rows := getRowsWithRounding(t)
tests := []struct {
name string
args args
writer *bytes.Buffer
stringWanted string
wantErr bool
err error
errWriter io.Writer
}{
{
"success",
args{
bar: getStackedBarPlot(rows),
},
&bytes.Buffer{},
getExpectedHtmlString(),
false,
nil,
nil,
},
{
"error while writing",
args{
bar: getStackedBarPlot(rows),
},
nil,
getExpectedHtmlString(),
true,
errors.New("error writer"),
&errorWriter{},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var err error
if tt.wantErr {
err = renderer(tt.args.bar, tt.errWriter)
} else {
err = renderer(tt.args.bar, tt.writer)
result := assertions.ShouldEqual(getHtmlWithoutUniqueId(tt.stringWanted), getHtmlWithoutUniqueId(tt.writer.String()))
if result != "" {
t.Errorf("Rendere() expected != actual. diff:%v", result)
}
}
if err != nil && err.Error() != tt.err.Error() {
t.Errorf("Renderer() error = %v, wantErr %v", err, tt.wantErr)
return
}
})
}
}
type errorWriter struct{}
func (er *errorWriter) Write(p []byte) (n int, err error) {
return 1, errors.New("error writer")
}
func getHtmlWithoutUniqueId(input string) string {
lines := strings.Split(input, "\n")
var result []string
for i := range lines {
// skipping the unique id lines
if i >= 11 && i <= 18 {
continue
}
result = append(result, lines[i])
}
return strings.Join(result, "\n")
}
func getExpectedHtmlString() string {
return `
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Awesome go-echarts</title>
<script src="https://go-echarts.github.io/go-echarts-assets/assets/echarts.min.js"></script>
</head>
<body>
<div class="container">
<div class="item" id="upuUxUZbTXgQ" style="width:1200px;height:600px;"></div>
</div>
<script type="text/javascript">
"use strict";
let goecharts_upuUxUZbTXgQ = echarts.init(document.getElementById('upuUxUZbTXgQ'), "white");
let option_upuUxUZbTXgQ = {"color":["#c23531","#2f4554","#61a0a8","#d48265","#91c7ae","#749f83","#ca8622","#bda29a","#6e7074","#546570"],"dataZoom":[{"type":"inside","end":50},{"type":"slider","end":50}],"legend":{"show":true},"series":[{"name":"Principal","type":"bar","stack":"stackA","waveAnimation":false,"data":[{"value":32871},{"value":33528},{"value":34199},{"value":34883},{"value":35581},{"value":36292},{"value":37018},{"value":37758},{"value":38514},{"value":39284},{"value":40070},{"value":40871},{"value":41688},{"value":42522},{"value":43373},{"value":44240},{"value":45125},{"value":46027},{"value":46948},{"value":47887},{"value":48845},{"value":49822},{"value":50818},{"value":51836}]},{"name":"Interest","type":"bar","stack":"stackA","waveAnimation":false,"data":[{"name":"20000","value":20000},{"name":"19343","value":19343},{"name":"18672","value":18672},{"name":"17988","value":17988},{"name":"17290","value":17290},{"name":"16579","value":16579},{"name":"15853","value":15853},{"name":"15113","value":15113},{"name":"14357","value":14357},{"name":"13587","value":13587},{"name":"12801","value":12801},{"name":"12000","value":12000},{"name":"11183","value":11183},{"name":"10349","value":10349},{"name":"9498","value":9498},{"name":"8631","value":8631},{"name":"7746","value":7746},{"name":"6844","value":6844},{"name":"5923","value":5923},{"name":"4984","value":4984},{"name":"4026","value":4026},{"name":"3049","value":3049},{"name":"2053","value":2053},{"name":"1037","value":1037}]},{"name":"Payment","type":"bar","stack":"stackA","waveAnimation":false,"data":[{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52871},{"value":52873}]}],"title":{"text":"Loan repayment schedule"},"toolbox":{"show":true},"tooltip":{"show":false},"xAxis":[{"data":["2020-05-14","2020-06-14","2020-07-14","2020-08-14","2020-09-14","2020-10-14","2020-11-14","2020-12-14","2021-01-14","2021-02-14","2021-03-14","2021-04-14","2021-05-14","2021-06-14","2021-07-14","2021-08-14","2021-09-14","2021-10-14","2021-11-14","2021-12-14","2022-01-14","2022-02-14","2022-03-14","2022-04-14"]}],"yAxis":[{}]};
goecharts_upuUxUZbTXgQ.setOption(option_upuUxUZbTXgQ);
</script>
<style>
.container {margin-top:30px; display: flex;justify-content: center;align-items: center;}
.item {margin: auto;}
</style>
</body>
</html>
`
}