Function TestErroredScript

txscript/scriptbuilder_test.go:371–441

TestErroredScript ensures that all of the functions that can be used to add data to a script don't modify the script once an error has happened.

(t *testing.T)

// TestErroredScript ensures that all of the functions that can be used to add
// data to a script don't modify the script once an error has happened.
func TestErroredScript(t *testing.T) {
	t.Parallel()

	// Start off by constructing a near max size script that has enough
	// space left to add each data type without an error and force an
	// initial error condition.
	builder := NewScriptBuilder()
	builder.Reset().AddFullData(make([]byte, MaxScriptSize-8))
	origScript, err := builder.Script()
	if err != nil {
		t.Fatalf("ScriptBuilder.AddFullData unexpected error: %v", err)
	}
	script, err := builder.AddData([]byte{0x00, 0x00, 0x00, 0x00, 0x00}).Script()
	if _, ok := err.(ErrScriptNotCanonical); !ok || err == nil {
		t.Fatalf("ScriptBuilder.AddData allowed exceeding max script "+
			"size: %v", len(script))
	}
	if !bytes.Equal(script, origScript) {
		t.Fatalf("ScriptBuilder.AddData unexpected modified script - "+
			"got len %d, want len %d", len(script), len(origScript))
	}

	// Ensure adding data, even using the non-canonical path, to a script
	// that has errored doesn't succeed.
	script, err = builder.AddFullData([]byte{0x00}).Script()
	if _, ok := err.(ErrScriptNotCanonical); !ok || err == nil {
		t.Fatal("ScriptBuilder.AddFullData succeeded on errored script")
	}
	if !bytes.Equal(script, origScript) {
		t.Fatalf("ScriptBuilder.AddFullData unexpected modified "+
			"script - got len %d, want len %d", len(script),
			len(origScript))
	}

	// Ensure adding data to a script that has errored doesn't succeed.
	script, err = builder.AddData([]byte{0x00}).Script()
	if _, ok := err.(ErrScriptNotCanonical); !ok || err == nil {
		t.Fatal("ScriptBuilder.AddData succeeded on errored script")
	}
	if !bytes.Equal(script, origScript) {
		t.Fatalf("ScriptBuilder.AddData unexpected modified "+
			"script - got len %d, want len %d", len(script),
			len(origScript))
	}

	// Ensure adding an opcode to a script that has errored doesn't succeed.
	script, err = builder.AddOp(OP_0).Script()
	if _, ok := err.(ErrScriptNotCanonical); !ok || err == nil {
		t.Fatal("ScriptBuilder.AddOp succeeded on errored script")
	}
	if !bytes.Equal(script, origScript) {
		t.Fatalf("ScriptBuilder.AddOp unexpected modified script - "+
			"got len %d, want len %d", len(script), len(origScript))
	}

	// Ensure adding an integer to a script that has errored doesn't
	// succeed.
	script, err = builder.AddInt64(0).Script()