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package tax
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import (
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"encoding/json"
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"testing"
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)
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func TestStatic_Name(t *testing.T) {
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p := NewStatic()
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if got := p.Name(); got != "static" {
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t.Errorf("Name() = %q, want %q", got, "static")
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}
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}
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func TestStatic_Compute(t *testing.T) {
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// rateBp is basis points (2500 = 25%).
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p := NewStatic()
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tests := []struct {
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total int64
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rateBp int
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want int64
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}{
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{1250, 2500, 250},
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{25000, 2500, 5000},
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{1000, 2000, 167},
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{0, 2500, 0},
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}
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for _, tt := range tests {
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got := p.Compute(tt.total, tt.rateBp)
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if got != tt.want {
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t.Errorf("Compute(%d, %d) = %d; want %d", tt.total, tt.rateBp, got, tt.want)
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}
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}
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}
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func TestStatic_DefaultTaxRate(t *testing.T) {
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p := NewStatic()
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if got := p.DefaultTaxRate("SE"); got != 0 {
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t.Errorf("DefaultTaxRate(\"SE\") = %d; want 0", got)
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}
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}
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func TestNordic_Name(t *testing.T) {
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p := NewNordic("SE")
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if got := p.Name(); got != "nordic" {
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t.Errorf("Name() = %q, want %q", got, "nordic")
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}
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}
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func TestNordic_Compute(t *testing.T) {
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// rateBp is basis points (2500 = 25%).
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tests := []struct {
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total int64
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rateBp int
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want int64
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desc string
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}{
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{0, 2500, 0, "zero total"},
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{1250, 2500, 250, "25 % VAT on 1250"},
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{1000, 2000, 167, "20 % VAT on 1000"},
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{1200, 2500, 240, "25 % VAT on 1200"},
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{25000, 2500, 5000, "25 % VAT on 25000"},
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{100, 1000, 10, "10 % VAT on 100"},
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{100, 10000, 50, "100 % VAT on 100"},
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{100, 0, 0, "zero-rate"},
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{100, -1, 0, "negative rate -> zero"},
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}
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for _, tt := range tests {
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p := NewNordic("SE")
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got := p.Compute(tt.total, tt.rateBp)
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if got != tt.want {
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t.Errorf("Compute(%d, %d) [%s] = %d; want %d", tt.total, tt.rateBp, tt.desc, got, tt.want)
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}
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}
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}
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func TestNordic_DefaultTaxRate(t *testing.T) {
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tests := []struct {
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country string
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want int
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desc string
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}{
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{"SE", 2500, "Sweden"},
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{"NO", 2500, "Norway"},
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{"DK", 2500, "Denmark"},
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{"FI", 2550, "Finland (25.5%)"},
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{"", 2500, "empty -> default SE"},
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{"DE", 2500, "unknown -> fallback SE"},
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}
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for _, tt := range tests {
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p := NewNordic("SE")
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got := p.DefaultTaxRate(tt.country)
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if got != tt.want {
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t.Errorf("DefaultTaxRate(%q) [%s] = %d; want %d", tt.country, tt.desc, got, tt.want)
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}
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}
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}
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func TestCompute(t *testing.T) {
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// rateBp is basis points (2500 = 25%).
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tests := []struct {
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total int64
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rateBp int
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want int64
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desc string
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}{
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{1250, 2500, 250, "canonical: 25 %"},
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{25000, 2500, 5000, "25k with 25 % -> 5k tax"},
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{0, 2500, 0, "zero total"},
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{1000, 1250, 112, "fractional: 12.5 %"}, // exVat 1000*10000/11250=888, tax 112
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}
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for _, tt := range tests {
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got := Compute(tt.total, tt.rateBp)
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if got != tt.want {
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t.Errorf("Compute(%d, %d) [%s] = %d; want %d", tt.total, tt.rateBp, tt.desc, got, tt.want)
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}
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}
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}
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func TestProviderInterface(t *testing.T) {
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var p Provider = NewNordic("SE")
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_ = p
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p2 := NewStatic()
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_ = p2
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}
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func TestPrice_NewAndString(t *testing.T) {
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p := NewPrice()
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if p.IncVat != 0 {
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t.Errorf("NewPrice().IncVat = %d; want 0", p.IncVat)
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}
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}
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func TestPrice_NewPriceFromIncVat(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500) // 25% in basis points
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if p.IncVat != 1250 {
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t.Errorf("IncVat = %d; want 1250", p.IncVat)
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}
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if len(p.VatRates) != 1 {
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t.Errorf("expected 1 vat rate, got %d", len(p.VatRates))
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}
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}
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func TestPrice_ValueExVat(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500) // 25%
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exVat := p.ValueExVat()
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if exVat != 1000 {
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t.Errorf("ValueExVat() = %d; want 1000", exVat)
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}
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}
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func TestPrice_TotalVat(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500) // 25%
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totalVat := p.TotalVat()
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if totalVat != 250 {
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t.Errorf("TotalVat() = %d; want 250", totalVat)
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}
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}
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func TestPrice_Multiply(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500)
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p.Multiply(2)
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if p.IncVat != 2500 {
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t.Errorf("IncVat after Multiply(2) = %d; want 2500", p.IncVat)
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}
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}
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func TestPrice_MultiplyPrice(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500)
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p2 := MultiplyPrice(*p, 3)
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if p2.IncVat != 3750 {
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t.Errorf("IncVat = %d; want 3750", p2.IncVat)
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}
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}
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func TestPrice_Add(t *testing.T) {
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a := NewPriceFromIncVat(1250, 2500)
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b := NewPriceFromIncVat(2500, 2500)
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a.Add(*b)
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if a.IncVat != 3750 {
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t.Errorf("IncVat after Add = %d; want 3750", a.IncVat)
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}
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}
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func TestPrice_Subtract(t *testing.T) {
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a := NewPriceFromIncVat(2500, 2500)
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b := NewPriceFromIncVat(1250, 2500)
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a.Subtract(*b)
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if a.IncVat != 1250 {
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t.Errorf("IncVat after Subtract = %d; want 1250", a.IncVat)
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}
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}
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func TestPrice_SumPrices(t *testing.T) {
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a := NewPriceFromIncVat(1250, 2500)
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b := NewPriceFromIncVat(2500, 2500)
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total := SumPrices(*a, *b)
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if total.IncVat != 3750 {
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t.Errorf("SumPrices IncVat = %d; want 3750", total.IncVat)
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}
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}
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func TestPrice_JSONRoundTrip(t *testing.T) {
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p := NewPriceFromIncVat(1250, 2500)
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data, err := json.Marshal(p)
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if err != nil {
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t.Fatalf("marshal error: %v", err)
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}
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var p2 Price
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if err := json.Unmarshal(data, &p2); err != nil {
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t.Fatalf("unmarshal error: %v", err)
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}
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if p2.IncVat != p.IncVat {
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t.Errorf("IncVat mismatch: have %d, want %d", p2.IncVat, p.IncVat)
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}
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}
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func TestPrice_SumPricesEmpty(t *testing.T) {
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total := SumPrices()
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if total.IncVat != 0 {
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t.Errorf("SumPrices() IncVat = %d; want 0", total.IncVat)
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}
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}
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