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Add comprehensive tests for Sum and Avg functions #423

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355 changes: 355 additions & 0 deletions decimal_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3611,6 +3611,361 @@ func TestAvg(t *testing.T) {
}
}

func TestSum_Single(t *testing.T) {
type testData struct {
value string
expected string
}

tests := []testData{
{"0", "0"},
{"5", "5"},
{"-5", "-5"},
{"3.14159", "3.14159"},
{"100.00", "100.00"},
}

for _, test := range tests {
d, err := NewFromString(test.value)
if err != nil {
t.Fatal(err)
}

result := Sum(d)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Sum(%s): expected %s, got %s",
test.value, test.expected, result.String())
}
}
}

func TestSum_Multiple(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"1", "2", "3"}, "6"},
{[]string{"10", "20", "30", "40"}, "100"},
{[]string{"1.5", "2.5", "3.5"}, "7.5"},
{[]string{"0.1", "0.2", "0.3"}, "0.6"},
{[]string{"100.123", "200.456", "300.789"}, "601.368"},
{[]string{"999999999999", "1"}, "1000000000000"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Sum(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Sum(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestSum_WithNegatives(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"10", "-5"}, "5"},
{[]string{"-10", "5"}, "-5"},
{[]string{"-1", "-2", "-3"}, "-6"},
{[]string{"10", "-5", "3", "-2"}, "6"},
{[]string{"100", "-50", "-25", "-10", "-5"}, "10"},
{[]string{"0.5", "-0.3"}, "0.2"},
{[]string{"-3.14159", "2.71828"}, "-0.42331"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Sum(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Sum(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestSum_WithZero(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"0"}, "0"},
{[]string{"0", "0", "0"}, "0"},
{[]string{"5", "0"}, "5"},
{[]string{"0", "5"}, "5"},
{[]string{"-5", "0"}, "-5"},
{[]string{"0", "-5"}, "-5"},
{[]string{"10", "0", "20", "0", "30"}, "60"},
{[]string{"0.0", "0.00", "0.000"}, "0.0"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Sum(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Sum(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestSum_Large(t *testing.T) {
count := 1000
values := make([]Decimal, count)
expectedSum := New(0, 0)

for i := 0; i < count; i++ {
values[i] = New(int64(i+1), 0)
expectedSum = expectedSum.Add(New(int64(i+1), 0))
}

result := Sum(values[0], values[1:]...)
if !result.Equal(expectedSum) {
t.Errorf("Sum of 1..%d: expected %s, got %s",
count, expectedSum.String(), result.String())
}

expectedAvg := expectedSum.Div(New(int64(count), 0))
avgResult := Avg(values[0], values[1:]...)
if !avgResult.Equal(expectedAvg) {
t.Errorf("Avg of 1..%d: expected %s, got %s",
count, expectedAvg.String(), avgResult.String())
}
}

func TestSum_Precision(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"0.1", "0.1", "0.1", "0.1", "0.1", "0.1", "0.1", "0.1", "0.1", "0.1"}, "1.0"},
{[]string{"0.123456789", "0.987654321"}, "1.11111111"},
{[]string{"3.1415926535", "2.7182818284"}, "5.8598744819"},
{[]string{"0.0000000001", "0.0000000001"}, "0.0000000002"},
{[]string{"1000000000000.0000000001", "0.9999999999"}, "1000000000001.0"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Sum(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Sum(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestAvg_Single(t *testing.T) {
type testData struct {
value string
expected string
}

tests := []testData{
{"0", "0"},
{"5", "5"},
{"-5", "-5"},
{"3.14159", "3.14159"},
{"100.00", "100.00"},
}

for _, test := range tests {
d, err := NewFromString(test.value)
if err != nil {
t.Fatal(err)
}

result := Avg(d)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Avg(%s): expected %s, got %s",
test.value, test.expected, result.String())
}
}
}

func TestAvg_Multiple(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"1", "2", "3"}, "2"},
{[]string{"10", "20", "30", "40"}, "25"},
{[]string{"1", "2", "3", "4", "5"}, "3"},
{[]string{"0", "0", "0"}, "0"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Avg(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Avg(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestAvg_WithNegatives(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"10", "-10"}, "0"},
{[]string{"-1", "-2", "-3"}, "-2"},
{[]string{"10", "-5", "3", "-2"}, "1.5"},
{[]string{"0", "-5", "5"}, "0"},
{[]string{"-3.14159", "3.14159"}, "0"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Avg(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Avg(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestAvg_Precision(t *testing.T) {
type testData struct {
values []string
expected string
}

tests := []testData{
{[]string{"1", "2", "3", "4"}, "2.5"},
{[]string{"1", "1", "1", "1", "2"}, "1.2"},
{[]string{"10", "20", "30"}, "20"},
{[]string{"1.5", "2.5"}, "2"},
{[]string{"0.1", "0.2", "0.3"}, "0.2"},
{[]string{"3.14159", "2.71828"}, "2.929935"},
}

for _, test := range tests {
decimals := make([]Decimal, len(test.values))
for i, v := range test.values {
d, err := NewFromString(v)
if err != nil {
t.Fatal(err)
}
decimals[i] = d
}

result := Avg(decimals[0], decimals[1:]...)
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}

if !result.Equal(expected) {
t.Errorf("Avg(%v): expected %s, got %s",
test.values, test.expected, result.String())
}
}
}

func TestRoundBankAnomaly(t *testing.T) {
a := New(25, -1)
b := New(250, -2)
Expand Down