Add some unit-tests for numeric

postgres/numeric/numeric.go

@@ -17,6 +17,19 @@ func Zero() Numeric {
 	return Numeric{pgtype.Numeric{Exp: 0, Int: big.NewInt(0), Status: pgtype.Present, NaN: false}}
 }
 
+func FromInt64(value int64) Numeric {
+	num := Numeric{}
+	num.Set(value)
+	return num
+}
+
+func FromInt64WithExp(value int64, exp int32) Numeric {
+	num := Numeric{}
+	num.Set(value)
+	num.Exp = exp
+	return num
+}
+
 func (n Numeric) GetFloat64() float64 {
 	if n.Status != pgtype.Present {
 		return 0
@@ -168,10 +181,16 @@ func (n Numeric) MarshalJSON() ([]byte, error) {
 	return bytesWithSeparator, nil
 }
 
-func Parse(text string) (Numeric, error) {
-	// Remove trailing currency
-	text = trimLastChar(text)
+func MustParse(text string) Numeric {
+	num, err := Parse(text)
+	if err != nil {
+		panic(err)
+	}
 
+	return num
+}
+
+func Parse(text string) (Numeric, error) {
 	// Unify decimal separator
 	text = strings.Replace(text, ",", ".", 1)
 
@@ -184,6 +203,13 @@ func Parse(text string) (Numeric, error) {
 	return num, nil
 }
 
+func ParseCurrency(text string) (Numeric, error) {
+	// Remove trailing currency
+	text = trimLastChar(text)
+
+	return Parse(text)
+}
+
 func trimLastChar(s string) string {
 	r, size := utf8.DecodeLastRuneInString(s)
 	if r == utf8.RuneError && (size == 0 || size == 1) {

postgres/numeric/numeric_test.go

@@ -0,0 +1,75 @@
+package numeric_test
+
+import (
+	"testing"
+
+	"git.javil.eu/jacob1123/budgeteer/postgres/numeric"
+)
+
+type TestCaseMarshalJSON struct {
+	Value  numeric.Numeric
+	Result string
+}
+
+func TestMarshalJSON(t *testing.T) {
+	tests := []TestCaseMarshalJSON{
+		{numeric.Zero(), `0`},
+		{numeric.MustParse("1.23"), "1.23"},
+		{numeric.MustParse("1,24"), "1.24"},
+		{numeric.MustParse("123456789.12345"), "123456789.12345"},
+	}
+	for _, test := range tests {
+		t.Run(test.Result, func(t *testing.T) {
+			z := test.Value
+			result, err := z.MarshalJSON()
+			if err != nil {
+				t.Error(err)
+				return
+			}
+
+			if string(result) != test.Result {
+				t.Errorf("Expected %s, got %s", test.Result, string(result))
+				return
+			}
+		})
+	}
+}
+
+type TestCaseParse struct {
+	Result numeric.Numeric
+	Value  string
+}
+
+func TestParse(t *testing.T) {
+	tests := []TestCaseParse{
+		{numeric.Zero(), `0`},
+		{numeric.FromInt64(1), `1`},
+		{numeric.FromInt64WithExp(1, 1), `10`},
+		{numeric.FromInt64WithExp(1, 2), `100`},
+		{numeric.MustParse("1.23"), "1.23"},
+		{numeric.MustParse("1,24"), "1.24"},
+		{numeric.MustParse("123456789.12345"), "123456789.12345"},
+	}
+	for _, test := range tests {
+		t.Run(test.Value, func(t *testing.T) {
+			result, err := numeric.Parse(test.Value)
+			if err != nil {
+				t.Error(err)
+				return
+			}
+
+			if test.Result.Int.Int64() != result.Int.Int64() {
+				t.Errorf("Expected int %d, got %d", test.Result.Int, result.Int)
+				return
+			}
+
+			if test.Result.Exp != result.Exp {
+				t.Errorf("Expected exp %d, got %d", test.Result.Exp, result.Exp)
+				return
+			}
+			//			if string(result) != test.Result {
+			//		return
+			//}
+		})
+	}
+}