neoneo-go/pkg/vm/stack/stackitem_test.go

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2019-02-27 20:56:19 +00:00
package stack
import (
"math/big"
"testing"
"github.com/stretchr/testify/assert"
)
// A simple test to ensure that by embedding the abstract interface
// we immediately become a stack item, with the default values set to nil
func TestInterfaceEmbedding(t *testing.T) {
// Create an anonymous struct that embeds the abstractItem
a := struct {
*abstractItem
}{
&abstractItem{},
}
// Since interface checking can be done at compile time.
// If he abstractItem did not implement all methods of our interface `Item`
// Then any struct which embeds it, will also not implement the Item interface.
// This test would then give errors, at compile time.
var Items []Item
Items = append(Items, a)
// Default methods should give errors
// Here we just need to test against one of the methods in the interface
for _, element := range Items {
x, err := element.Integer()
assert.Nil(t, x)
assert.NotNil(t, err, nil)
}
}
// TestIntCasting is a simple test to test that the Integer method is overwritten
// from the abstractItem
func TestIntMethodOverride(t *testing.T) {
testValues := []int64{0, 10, 200, 30, 90}
var Items []Item
// Convert a range of int64s into Stack Integers
// Adding them into an array of StackItems
for _, num := range testValues {
stackInteger, err := NewInt(big.NewInt(num))
if err != nil {
t.Fail()
}
Items = append(Items, stackInteger)
}
// For each item, call the Integer method on the interface
// Which should return an integer and no error
// as the stack integer struct overrides that method
for i, element := range Items {
k, err := element.Integer()
if err != nil {
t.Fail()
}
if k.val.Cmp(big.NewInt(testValues[i])) != 0 {
t.Fail()
}
}
}