func testStep(
opts terraform.ContextOpts,
state *terraform.State,
step TestStep) (*terraform.State, error) {
if step.PreConfig != nil {
step.PreConfig()
}
cfgPath, err := ioutil.TempDir("", "tf-test")
if err != nil {
return state, fmt.Errorf(
"Error creating temporary directory for config: %s", err)
}
defer os.RemoveAll(cfgPath)
// Write the configuration
cfgF, err := os.Create(filepath.Join(cfgPath, "main.tf"))
if err != nil {
return state, fmt.Errorf(
"Error creating temporary file for config: %s", err)
}
_, err = io.Copy(cfgF, strings.NewReader(step.Config))
cfgF.Close()
if err != nil {
return state, fmt.Errorf(
"Error creating temporary file for config: %s", err)
}
// Parse the configuration
mod, err := module.NewTreeModule("", cfgPath)
if err != nil {
return state, fmt.Errorf(
"Error loading configuration: %s", err)
}
// Load the modules
modStorage := &getter.FolderStorage{
StorageDir: filepath.Join(cfgPath, ".tfmodules"),
}
err = mod.Load(modStorage, module.GetModeGet)
if err != nil {
return state, fmt.Errorf("Error downloading modules: %s", err)
}
// Build the context
opts.Module = mod
opts.State = state
opts.Destroy = step.Destroy
ctx := terraform.NewContext(&opts)
if ws, es := ctx.Validate(); len(ws) > 0 || len(es) > 0 {
if len(es) > 0 {
estrs := make([]string, len(es))
for i, e := range es {
estrs[i] = e.Error()
}
return state, fmt.Errorf(
"Configuration is invalid.\n\nWarnings: %#v\n\nErrors: %#v",
ws, estrs)
}
log.Printf("[WARN] Config warnings: %#v", ws)
}
// Refresh!
state, err = ctx.Refresh()
if err != nil {
return state, fmt.Errorf(
"Error refreshing: %s", err)
}
// Plan!
if p, err := ctx.Plan(); err != nil {
return state, fmt.Errorf(
"Error planning: %s", err)
} else {
log.Printf("[WARN] Test: Step plan: %s", p)
}
// We need to keep a copy of the state prior to destroying
// such that destroy steps can verify their behaviour in the check
// function
stateBeforeApplication := state.DeepCopy()
// Apply!
state, err = ctx.Apply()
if err != nil {
return state, fmt.Errorf("Error applying: %s", err)
}
// Check! Excitement!
if step.Check != nil {
if step.Destroy {
if err := step.Check(stateBeforeApplication); err != nil {
return state, fmt.Errorf("Check failed: %s", err)
}
} else {
if err := step.Check(state); err != nil {
return state, fmt.Errorf("Check failed: %s", err)
}
}
}
// Now, verify that Plan is now empty and we don't have a perpetual diff issue
// We do this with TWO plans. One without a refresh.
var p *terraform.Plan
if p, err = ctx.Plan(); err != nil {
return state, fmt.Errorf("Error on follow-up plan: %s", err)
}
if p.Diff != nil && !p.Diff.Empty() && !step.ExpectNonEmptyPlan {
return state, fmt.Errorf(
"After applying this step, the plan was not empty:\n\n%s", p)
}
// And another after a Refresh.
state, err = ctx.Refresh()
if err != nil {
return state, fmt.Errorf(
"Error on follow-up refresh: %s", err)
}
if p, err = ctx.Plan(); err != nil {
return state, fmt.Errorf("Error on second follow-up plan: %s", err)
}
if p.Diff != nil && !p.Diff.Empty() && !step.ExpectNonEmptyPlan {
return state, fmt.Errorf(
"After applying this step and refreshing, the plan was not empty:\n\n%s", p)
}
// Made it here, but expected a non-empty plan, fail!
if step.ExpectNonEmptyPlan && (p.Diff == nil || p.Diff.Empty()) {
return state, fmt.Errorf("Expected a non-empty plan, but got an empty plan!")
}
// Made it here? Good job test step!
return state, nil
}