forked from TrueCloudLab/neoneo-go
24cd21bd8c
[VM] - Changed vmstate from HALT to FAULT in Sub opcode - Implemented THROW opcode + tests - Renamed TestSimpleRun test to TestThrowIfNot
146 lines
3.4 KiB
Go
146 lines
3.4 KiB
Go
package vm
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import (
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"fmt"
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"testing"
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"github.com/CityOfZion/neo-go/pkg/vm/stack"
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"github.com/stretchr/testify/assert"
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)
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func TestPushAdd(t *testing.T) {
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builder := stack.NewBuilder()
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// PUSH TWO NUMBER
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// ADD THEM TOGETHER
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builder.EmitInt(20).EmitInt(34).EmitOpcode(stack.ADD)
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// Pass program to VM
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vm := NewVM(builder.Bytes())
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// Execute first OPCODE
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// Should be PUSH(20)
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state, err := vm.step()
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assert.Equal(t, NONE, int(state))
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assert.Nil(t, err)
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// We should have the number 20 on stack
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ok := peekTopEStackIsValue(t, vm, 20)
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assert.True(t, ok)
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// Excute second OPCODE
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// Should be PUSH(34)
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state, err = vm.step()
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assert.Equal(t, NONE, int(state))
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assert.Nil(t, err)
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// We should have the number 34 at the top of the stack
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ok = peekTopEStackIsValue(t, vm, 34)
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assert.True(t, ok)
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// Excute third OPCODE
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// Should Add both values on the stack
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state, err = vm.step()
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assert.Equal(t, NONE, int(state))
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assert.Nil(t, err)
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// We should now have one value on the stack
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//It should be equal to 20+34 = 54
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ok = EstackLen(t, vm, 1)
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assert.True(t, ok)
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ok = peekTopEStackIsValue(t, vm, 54)
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assert.True(t, ok)
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// If we try to step again, we should get a nil error and HALT
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// because we have gone over the instruction pointer
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// error is nil because when there are nomore instructions, the vm
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// will add a RET opcode and return
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state, err = vm.step()
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assert.Equal(t, HALT, int(state))
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assert.Nil(t, err)
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}
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func TestThrowIfNot(t *testing.T) {
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// Program pushes 20 and 34 to the stack
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// Adds them together
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// pushes 54 to the stack
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// Checks if result of addition and 54 are equal
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// Faults if not
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// Push(20)
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// Push(34)
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// Add
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// Push(54)
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// Equal
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//THROWIFNOT
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builder := stack.NewBuilder()
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builder.EmitInt(20).EmitInt(34).EmitOpcode(stack.ADD)
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builder.EmitInt(54).EmitOpcode(stack.EQUAL).EmitOpcode(stack.THROWIFNOT)
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// Pass program to VM
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vm := NewVM(builder.Bytes())
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// Runs vm with program
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_, err := vm.Run()
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assert.Nil(t, err)
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// ResultStack should be nil
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assert.Equal(t, -1, vm.ResultStack.Len())
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// InvocationStack should be empty
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assert.Equal(t, 0, vm.InvocationStack.Len())
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}
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func TestThrow(t *testing.T) {
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// Program pushes 20 to the stack
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// exits with an error
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// Push(20)
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// THROW
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builder := stack.NewBuilder()
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builder.EmitInt(20).EmitOpcode(stack.THROW)
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// Pass program to VM
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vm := NewVM(builder.Bytes())
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// Runs vm with program
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_, err := vm.Run()
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assert.NotNil(t, err)
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ctx, err := vm.InvocationStack.CurrentContext()
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assert.Equal(t, nil, err)
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assert.Equal(t, 1, ctx.Estack.Len())
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assert.Equal(t, -1, ctx.Astack.Len())
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}
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// returns true if the value at the top of the evaluation stack is a integer
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// and equals the value passed in
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func peekTopEStackIsValue(t *testing.T, vm *VM, value int64) bool {
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item := peakTopEstack(t, vm)
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integer, err := item.Integer()
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assert.Nil(t, err)
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return value == integer.Value().Int64()
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}
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// peaks the stack item on the top of the evaluation stack
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// if the current context and returns it
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func peakTopEstack(t *testing.T, vm *VM) stack.Item {
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ctx, err := vm.InvocationStack.CurrentContext()
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fmt.Println(err)
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assert.Nil(t, err)
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item, err := ctx.Estack.Peek(0)
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assert.Nil(t, err)
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return item
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}
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// returns true if the total number of items on the evaluation stack is equal to value
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func EstackLen(t *testing.T, vm *VM, value int) bool {
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ctx, err := vm.InvocationStack.CurrentContext()
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assert.Nil(t, err)
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return value == ctx.Estack.Len()
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}
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