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null_decimal_test.go
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null_decimal_test.go
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package decimal
import (
"database/sql/driver"
"encoding/xml"
"testing"
)
func TestNullDecimalXML(t *testing.T) {
// test valid values
for _, x := range testTable {
s := x.short
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
docStr := `<account><amount>` + s + `</amount></account>`
err := xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if doc.Amount.Decimal.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
out, err := xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStr {
t.Errorf("expected %s, got %s", docStr, string(out))
}
}
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
// test for XML with empty body
docStr := `<account><amount></amount></account>`
err := xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling: %s: %v", docStr, err)
} else if doc.Amount.Valid {
t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)",
doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
expected := `<account><amount></amount></account>`
out, err := xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expected {
t.Errorf("expected %s, got %s", expected, string(out))
}
// test for empty XML
docStr = `<account></account>`
err = xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling: %s: %v", docStr, err)
} else if doc.Amount.Valid {
t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)",
doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
expected = `<account><amount></amount></account>`
out, err = xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expected {
t.Errorf("expected %s, got %s", expected, string(out))
}
}
func TestNullDecimalBadXML(t *testing.T) {
for _, testCase := range []string{
"o_o",
"<abc",
"<account><amount>7",
`<html><body></body></html>`,
`<account><amount>nope</amount></account>`,
`0.333`,
} {
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
err := xml.Unmarshal([]byte(testCase), &doc)
if err == nil {
t.Errorf("expected error, got %+v", doc)
}
}
}
func TestNullDecimal_Scan(t *testing.T) {
// test the Scan method that implements the
// sql.Scanner interface
// check for the for different type of values
// that are possible to be received from the database
// drivers
// in normal operations the db driver (sqlite at least)
// will return an int64 if you specified a numeric format
// Make sure handles nil values
a := NullDecimal{}
var dbvaluePtr interface{}
err := a.Scan(dbvaluePtr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(nil) failed with message: %s", err)
} else {
if a.Valid {
t.Errorf("%s is not null", a.Decimal)
}
}
dbvalue := 54.33
expected := NewFromFloat(dbvalue)
err = a.Scan(dbvalue)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(54.33) failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%s does not equal to %s", a.Decimal, expected)
}
}
// at least SQLite returns an int64 when 0 is stored in the db
// and you specified a numeric format on the schema
dbvalueInt := int64(0)
expected = New(dbvalueInt, 0)
err = a.Scan(dbvalueInt)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(0) failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
// in case you specified a varchar in your SQL schema,
// the database driver will return byte slice []byte
valueStr := "535.666"
dbvalueStr := []byte(valueStr)
expected, err = NewFromString(valueStr)
if err != nil {
t.Fatal(err)
}
err = a.Scan(dbvalueStr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan('535.666') failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
// lib/pq can also return strings
expected, err = NewFromString(valueStr)
if err != nil {
t.Fatal(err)
}
err = a.Scan(valueStr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan('535.666') failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
}
func TestNullDecimal_Value(t *testing.T) {
// Make sure this does implement the database/sql's driver.Valuer interface
var nullDecimal NullDecimal
if _, ok := interface{}(nullDecimal).(driver.Valuer); !ok {
t.Error("NullDecimal does not implement driver.Valuer")
}
// check that null is handled appropriately
value, err := nullDecimal.Value()
if err != nil {
t.Errorf("NullDecimal{}.Valid() failed with message: %s", err)
} else if value != nil {
t.Errorf("%v is not nil", value)
}
// check that normal case is handled appropriately
a := NullDecimal{Decimal: New(1234, -2), Valid: true}
expected := "12.34"
value, err = a.Value()
if err != nil {
t.Errorf("NullDecimal(12.34).Value() failed with message: %s", err)
} else if value.(string) != expected {
t.Errorf("%v does not equal %v", a, expected)
}
}