terraform/states/statemgr/testing.go

160 lines
4.8 KiB
Go

package statemgr
import (
"reflect"
"testing"
"github.com/davecgh/go-spew/spew"
"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/states/statefile"
)
// TestFull is a helper for testing full state manager implementations. It
// expects that the given implementation is pre-loaded with a snapshot of the
// result from TestFullInitialState.
//
// If the given state manager also implements PersistentMeta, this function
// will test that the snapshot metadata changes as expected between calls
// to the methods of Persistent.
func TestFull(t *testing.T, s Full) {
t.Helper()
if err := s.RefreshState(); err != nil {
t.Fatalf("err: %s", err)
}
// Check that the initial state is correct.
// These do have different Lineages, but we will replace current below.
initial := TestFullInitialState()
if state := s.State(); !state.Equal(initial) {
t.Fatalf("state does not match expected initial state\n\ngot:\n%s\nwant:\n%s", spew.Sdump(state), spew.Sdump(initial))
}
var initialMeta SnapshotMeta
if sm, ok := s.(PersistentMeta); ok {
initialMeta = sm.StateSnapshotMeta()
}
// Now we've proven that the state we're starting with is an initial
// state, we'll complete our work here with that state, since otherwise
// further writes would violate the invariant that we only try to write
// states that share the same lineage as what was initially written.
current := s.State()
// Write a new state and verify that we have it
current.RootModule().SetOutputValue("bar", cty.StringVal("baz"), false)
if err := s.WriteState(current); err != nil {
t.Fatalf("err: %s", err)
}
if actual := s.State(); !actual.Equal(current) {
t.Fatalf("bad:\n%#v\n\n%#v", actual, current)
}
// Test persistence
if err := s.PersistState(); err != nil {
t.Fatalf("err: %s", err)
}
// Refresh if we got it
if err := s.RefreshState(); err != nil {
t.Fatalf("err: %s", err)
}
var newMeta SnapshotMeta
if sm, ok := s.(PersistentMeta); ok {
newMeta = sm.StateSnapshotMeta()
if got, want := newMeta.Lineage, initialMeta.Lineage; got != want {
t.Errorf("Lineage changed from %q to %q", want, got)
}
if after, before := newMeta.Serial, initialMeta.Serial; after == before {
t.Errorf("Serial didn't change from %d after new module added", before)
}
}
// Same serial
serial := newMeta.Serial
if err := s.WriteState(current); err != nil {
t.Fatalf("err: %s", err)
}
if err := s.PersistState(); err != nil {
t.Fatalf("err: %s", err)
}
if sm, ok := s.(PersistentMeta); ok {
newMeta = sm.StateSnapshotMeta()
if newMeta.Serial != serial {
t.Fatalf("serial changed after persisting with no changes: got %d, want %d", newMeta.Serial, serial)
}
}
if sm, ok := s.(PersistentMeta); ok {
newMeta = sm.StateSnapshotMeta()
}
// Change the serial
current = current.DeepCopy()
current.EnsureModule(addrs.RootModuleInstance).SetOutputValue(
"serialCheck", cty.StringVal("true"), false,
)
if err := s.WriteState(current); err != nil {
t.Fatalf("err: %s", err)
}
if err := s.PersistState(); err != nil {
t.Fatalf("err: %s", err)
}
if sm, ok := s.(PersistentMeta); ok {
oldMeta := newMeta
newMeta = sm.StateSnapshotMeta()
if newMeta.Serial <= serial {
t.Fatalf("serial incorrect after persisting with changes: got %d, want > %d", newMeta.Serial, serial)
}
if newMeta.TerraformVersion != oldMeta.TerraformVersion {
t.Fatalf("TFVersion changed from %s to %s", oldMeta.TerraformVersion, newMeta.TerraformVersion)
}
// verify that Lineage doesn't change along with Serial, or during copying.
if newMeta.Lineage != oldMeta.Lineage {
t.Fatalf("Lineage changed from %q to %q", oldMeta.Lineage, newMeta.Lineage)
}
}
// Check that State() returns a copy by modifying the copy and comparing
// to the current state.
stateCopy := s.State()
stateCopy.EnsureModule(addrs.RootModuleInstance.Child("another", addrs.NoKey))
if reflect.DeepEqual(stateCopy, s.State()) {
t.Fatal("State() should return a copy")
}
// our current expected state should also marshal identically to the persisted state
if !statefile.StatesMarshalEqual(current, s.State()) {
t.Fatalf("Persisted state altered unexpectedly.\n\ngot:\n%s\nwant:\n%s", spew.Sdump(s.State()), spew.Sdump(current))
}
}
// TestFullInitialState is a state that should be snapshotted into a
// full state manager before passing it into TestFull.
func TestFullInitialState() *states.State {
state := states.NewState()
childMod := state.EnsureModule(addrs.RootModuleInstance.Child("child", addrs.NoKey))
rAddr := addrs.Resource{
Mode: addrs.ManagedResourceMode,
Type: "null_resource",
Name: "foo",
}
providerAddr := addrs.AbsProviderConfig{
Provider: rAddr.DefaultProvider(),
Module: addrs.RootModuleInstance,
}
childMod.SetResourceMeta(rAddr, states.EachList, providerAddr)
return state
}