63d1860dc0
Add a full payment and subscription system supporting EasyPay (Alipay/WeChat), Stripe, and direct Alipay/WeChat Pay providers with multi-instance load balancing.
112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package payment
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import (
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"testing"
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)
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func TestCalculatePayAmount(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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amount float64
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feeRate float64
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expected string
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}{
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{
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name: "zero fee rate returns same amount",
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amount: 100.00,
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feeRate: 0,
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expected: "100.00",
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},
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{
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name: "negative fee rate returns same amount",
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amount: 50.00,
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feeRate: -5,
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expected: "50.00",
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},
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{
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name: "1 percent fee rate",
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amount: 100.00,
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feeRate: 1,
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expected: "101.00",
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},
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{
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name: "5 percent fee on 200",
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amount: 200.00,
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feeRate: 5,
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expected: "210.00",
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},
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{
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name: "fee rounds UP to 2 decimal places",
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amount: 100.00,
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feeRate: 3,
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expected: "103.00",
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},
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{
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name: "fee rounds UP small remainder",
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amount: 10.00,
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feeRate: 3.33,
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expected: "10.34", // 10 * 3.33 / 100 = 0.333 -> round up -> 0.34
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},
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{
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name: "very small amount",
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amount: 0.01,
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feeRate: 1,
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expected: "0.02", // 0.01 * 1/100 = 0.0001 -> round up -> 0.01 -> total 0.02
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},
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{
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name: "large amount",
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amount: 99999.99,
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feeRate: 10,
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expected: "109999.99", // 99999.99 * 10/100 = 9999.999 -> round up -> 10000.00 -> total 109999.99
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},
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{
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name: "100 percent fee rate doubles amount",
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amount: 50.00,
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feeRate: 100,
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expected: "100.00",
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},
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{
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name: "precision 0.01 fee difference",
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amount: 100.00,
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feeRate: 1.01,
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expected: "101.01", // 100 * 1.01/100 = 1.01
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},
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{
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name: "precision 0.02 fee",
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amount: 100.00,
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feeRate: 1.02,
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expected: "101.02",
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},
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{
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name: "zero amount with positive fee",
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amount: 0,
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feeRate: 5,
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expected: "0.00",
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},
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{
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name: "fractional amount no fee",
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amount: 19.99,
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feeRate: 0,
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expected: "19.99",
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},
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{
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name: "fractional fee that causes rounding up",
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amount: 33.33,
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feeRate: 7.77,
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expected: "35.92", // 33.33 * 7.77 / 100 = 2.589741 -> round up -> 2.59 -> total 35.92
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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t.Parallel()
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got := CalculatePayAmount(tt.amount, tt.feeRate)
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if got != tt.expected {
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t.Fatalf("CalculatePayAmount(%v, %v) = %q, want %q", tt.amount, tt.feeRate, got, tt.expected)
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}
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})
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}
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}
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