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interests_test.go
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interests_test.go
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// MIT License
// Copyright (c) 2016 rutcode-go
package interests_test
import (
"fmt"
"testing"
"github.com/go-rut/algorithm/interests"
. "github.com/smartystreets/goconvey/convey"
)
func TestErrors(t *testing.T) {
Convey("failed get interest", t, func() {
_, err := interests.GetInterestRepo(0)
So(err, ShouldNotBeNil)
})
}
func TestAverageCapitalPlus(t *testing.T) {
plus, _ := interests.GetInterestRepo(interests.CalcTypeAverageCapitalPlus)
Convey("failed get interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeMonth,
PayTimes: 12,
Amount: 3000000,
}
Convey("input negative interest rate", func() {
set.InterestRate = -10.0 / 1000
Convey("will return error", func() {
_, err := plus.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input not supported rate type", func() {
set.InterestRate = 10.0 / 1000
set.RateType = 0
Convey("will return error", func() {
_, err := plus.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 pay times", func() {
set.RateType = interests.RateTypeMonth
set.PayTimes = 0
Convey("will return error", func() {
_, err := plus.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 amount", func() {
set.PayTimes = 6
set.Amount = 0
Convey("will return error", func() {
_, err := plus.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input invalid start date", func() {
set.Amount = 3000000
set.StartDate = ""
Convey("will return error", func() {
_, err := plus.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
})
Convey("get correct interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeYear,
InterestRate: 240.0 / 1000,
PayTimes: 12,
Amount: 1000000,
StartDate: "2015-08-31",
}
Convey("input correct params", func() {
Convey("will return AverageCapitalPlus payback", func() {
payback, err := plus.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.TotalPayBack, ShouldEqual, 1134715)
So(payback.Interests, ShouldEqual, 134715)
So(payback.PayBackDay, ShouldEqual, 31)
So(payback.Backs[0].PayDate, ShouldEqual, "2015-09-30")
So(payback.Backs[1].PayDate, ShouldEqual, "2015-10-31")
set.StartDate = "2015-09-30"
payback, err = plus.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.Backs[0].PayDate, ShouldEqual, "2015-10-30")
set.StartDate = "2016-02-28"
payback, err = plus.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.Backs[0].PayDate, ShouldEqual, "2016-03-28")
})
})
Convey("input CalcAllPaybackAmount", func() {
Convey("will return AverageCapitalPlus payback Amount", func() {
amount, err := plus.CalcAllPaybackAmount(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 1134715)
amount, err = plus.CalcAllInterests(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 134715)
})
})
Convey("input daily rate", func() {
set := &interests.InterestSets{
RateType: interests.RateTypeDay,
InterestRate: 0.018 / 100,
PayTimes: 24,
Amount: 2400000,
StartDate: "2016-12-10",
}
Convey("will return AverageCapitalPlus payback", func() {
payback, err := plus.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.TotalPayBack, ShouldEqual, 2565343)
So(payback.Interests, ShouldEqual, 165343)
So(payback.PayBackDay, ShouldEqual, 10)
So(payback.Backs[0].PayDate, ShouldEqual, "2017-01-10")
So(payback.Backs[1].PayDate, ShouldEqual, "2017-02-10")
So(payback.Backs[23].PayDate, ShouldEqual, "2018-12-10")
So(payback.Backs[22].Total, ShouldEqual, 106889)
So(payback.Backs[23].Total, ShouldEqual, 106896)
})
})
Convey("input 0.18", func() {
set := &interests.InterestSets{
RateType: interests.RateTypeDay,
InterestRate: 0.018 / 100,
PayTimes: 24,
Amount: 10000000,
StartDate: "2016-12-10",
}
Convey("will return AverageCapitalPlus payback", func() {
payback, _ := plus.CalcPayback(set)
fmt.Println(payback)
x := 0.0
for _, v := range payback.Backs {
x += float64(payback.Principal) * 12.0 / 100.0 / 12
payback.Principal = payback.Principal - v.Total + int64(x)
fmt.Println(x, v.Interests)
}
fmt.Println(x, int64(x)-payback.Interests)
})
})
})
}
func TestAverageCapital(t *testing.T) {
capital, _ := interests.GetInterestRepo(interests.CalcTypeAverageCapital)
Convey("failed get interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeMonth,
PayTimes: 12,
Amount: 3000000,
}
Convey("input negative interest rate", func() {
set.InterestRate = -10.0 / 1000
Convey("will return error", func() {
_, err := capital.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input not supported rate type", func() {
set.InterestRate = 10.0 / 1000
set.RateType = 0
Convey("will return error", func() {
_, err := capital.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 pay times", func() {
set.RateType = interests.RateTypeMonth
set.PayTimes = 0
Convey("will return error", func() {
_, err := capital.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 amount", func() {
set.PayTimes = 6
set.Amount = 0
Convey("will return error", func() {
_, err := capital.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input invalid start date", func() {
set.Amount = 3000000
set.StartDate = ""
Convey("will return error", func() {
_, err := capital.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
})
Convey("get correct interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeYear,
InterestRate: 240.0 / 1000,
PayTimes: 12,
Amount: 1000000,
StartDate: "2015-08-31",
}
Convey("input correct params", func() {
Convey("will return AverageCapital payback", func() {
payback, err := capital.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.TotalPayBack, ShouldEqual, 1130000)
So(payback.Interests, ShouldEqual, 130000)
So(payback.PayBackDay, ShouldEqual, 31)
So(payback.Backs[0].PayDate, ShouldEqual, "2015-09-30")
So(payback.Backs[1].PayDate, ShouldEqual, "2015-10-31")
So(payback.Backs[11].Total, ShouldEqual, 85004)
set.StartDate = "2015-09-30"
payback, err = capital.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.Backs[0].PayDate, ShouldEqual, "2015-10-30")
set.StartDate = "2016-02-28"
payback, err = capital.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.Backs[0].PayDate, ShouldEqual, "2016-03-28")
So(payback.Backs[11].Total, ShouldEqual, 85004)
})
})
Convey("input CalcAllPaybackAmount", func() {
Convey("will return AverageCapital payback Amount", func() {
amount, err := capital.CalcAllPaybackAmount(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 1130000)
amount, err = capital.CalcAllInterests(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 130000)
})
})
})
}
func TestDaily(t *testing.T) {
daily, _ := interests.GetInterestRepo(interests.CalcTypeDaily)
Convey("failed get interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeMonth,
PayTimes: 12,
Amount: 3000000,
}
Convey("input negative interest rate", func() {
set.InterestRate = -10.0 / 1000
Convey("will return error", func() {
_, err := daily.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input not supported rate type", func() {
set.InterestRate = 10.0 / 1000
set.RateType = 0
Convey("will return error", func() {
_, err := daily.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 pay times", func() {
set.RateType = interests.RateTypeMonth
set.PayTimes = 0
Convey("will return error", func() {
_, err := daily.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input 0 amount", func() {
set.PayTimes = 6
set.Amount = 0
Convey("will return error", func() {
_, err := daily.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
Convey("input invalid start date", func() {
set.Amount = 3000000
set.StartDate = ""
Convey("will return error", func() {
_, err := daily.CalcPayback(set)
So(err, ShouldNotBeNil)
})
})
})
Convey("get correct day rate interest", t, func() {
set := &interests.InterestSets{
RateType: interests.RateTypeDay,
InterestRate: 0.1 / 100,
PayTimes: 30,
Amount: 1000000,
StartDate: "2015-08-31",
}
Convey("input correct params", func() {
Convey("will return daily payback", func() {
payback, err := daily.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.TotalPayBack, ShouldEqual, 1030000)
So(payback.Interests, ShouldEqual, 30000)
So(payback.EndDate, ShouldEqual, "2015-09-01")
})
Convey("will return daily payback amount", func() {
amount, err := daily.CalcAllPaybackAmount(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 1030000)
amount, err = daily.CalcAllInterests(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 30000)
})
})
set = &interests.InterestSets{
RateType: interests.RateTypeYear,
InterestRate: 36.0 / 100,
PayTimes: 10,
Amount: 1000000,
StartDate: "2015-08-31",
}
Convey("input correct year rate params", func() {
Convey("will return daily payback", func() {
payback, err := daily.CalcPayback(set)
So(err, ShouldBeNil)
So(payback.TotalPayBack, ShouldEqual, 1010000)
So(payback.Interests, ShouldEqual, 10000)
So(payback.EndDate, ShouldEqual, "2015-09-01")
})
Convey("will return daily payback amount", func() {
amount, err := daily.CalcAllPaybackAmount(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 1010000)
amount, err = daily.CalcAllInterests(set)
So(err, ShouldBeNil)
So(amount, ShouldEqual, 10000)
})
})
})
}