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package compile_test
import (
"bytes"
"strings"
"testing"
"go.starlark.net/starlark"
)
// TestSerialization verifies that a serialized program can be loaded,
// deserialized, and executed.
func TestSerialization(t *testing.T) {
predeclared := starlark.StringDict{
"x": starlark.String("mur"),
"n": starlark.MakeInt(2),
}
const src = `
def mul(a, b):
return a * b
y = mul(x, n)
`
_, oldProg, err := starlark.SourceProgram("mul.star", src, predeclared.Has)
if err != nil {
t.Fatal(err)
}
buf := new(bytes.Buffer)
if err := oldProg.Write(buf); err != nil {
t.Fatalf("oldProg.WriteTo: %v", err)
}
newProg, err := starlark.CompiledProgram(buf)
if err != nil {
t.Fatalf("CompiledProgram: %v", err)
}
thread := new(starlark.Thread)
globals, err := newProg.Init(thread, predeclared)
if err != nil {
t.Fatalf("newProg.Init: %v", err)
}
if got, want := globals["y"], starlark.String("murmur"); got != want {
t.Errorf("Value of global was %s, want %s", got, want)
t.Logf("globals: %v", globals)
}
// Verify stack frame.
predeclared["n"] = starlark.None
_, err = newProg.Init(thread, predeclared)
evalErr, ok := err.(*starlark.EvalError)
if !ok {
t.Fatalf("newProg.Init call returned err %v, want *EvalError", err)
}
const want = `Traceback (most recent call last):
mul.star:5:8: in <toplevel>
mul.star:3:14: in mul
Error: unknown binary op: string * NoneType`
if got := evalErr.Backtrace(); got != want {
t.Fatalf("got <<%s>>, want <<%s>>", got, want)
}
}
func TestGarbage(t *testing.T) {
const garbage = "This is not a compiled Starlark program."
_, err := starlark.CompiledProgram(strings.NewReader(garbage))
if err == nil {
t.Fatalf("CompiledProgram did not report an error when decoding garbage")
}
if !strings.Contains(err.Error(), "not a compiled module") {
t.Fatalf("CompiledProgram reported the wrong error when decoding garbage: %v", err)
}
}
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