(Feat): Initial Commit

internal/util/currency_test.go

@@ -0,0 +1,66 @@
+package util_test
+
+import (
+	"testing"
+
+	"allaboutapps.dev/aw/go-starter/internal/util"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCurrencyConversion(t *testing.T) {
+	tests := []struct {
+		name string
+		val  int
+	}{
+		{
+			name: "1",
+			val:  999999999999999, // this is the max size with accurate precision
+		},
+		{
+			name: "2",
+			val:  0,
+		},
+		{
+			name: "3",
+			val:  -999999999999999,
+		},
+		{
+			name: "4",
+			val:  3333333333333333,
+		},
+		{
+			name: "5",
+			val:  1111111111111111,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			in := int64(tt.val)
+			res := util.Int64PtrWithCentsToFloat64Ptr(&in)
+			out := util.Float64PtrToInt64PtrWithCents(res)
+			assert.Equal(t, in, *out)
+
+			inInt := int(in)
+			res = util.IntPtrWithCentsToFloat64Ptr(&inInt)
+			outInt := util.Float64PtrToIntPtrWithCents(res)
+			assert.Equal(t, inInt, *outInt)
+			outInt2 := util.Float64ToInt64WithCents(*res)
+			assert.Equal(t, int64(inInt), outInt2)
+		})
+	}
+}
+
+func TestCurrencyConversionNil(t *testing.T) {
+	res := util.Int64PtrWithCentsToFloat64Ptr(nil)
+	assert.Nil(t, res)
+
+	res = util.IntPtrWithCentsToFloat64Ptr(nil)
+	assert.Nil(t, res)
+
+	res2 := util.Float64PtrToInt64PtrWithCents(nil)
+	assert.Nil(t, res2)
+
+	res3 := util.Float64PtrToIntPtrWithCents(nil)
+	assert.Nil(t, res3)
+}