Add helper for extracting plan struct without logging and without specifying a plan file

modules/terraform/plan.go

@@ -2,7 +2,10 @@ package terraform
 
 import (
 	"fmt"
+	"io/ioutil"
+	"os"
 
+	"github.com/gruntwork-io/terratest/modules/logger"
 	"github.com/gruntwork-io/terratest/modules/testing"
 	"github.com/stretchr/testify/require"
 )
@@ -59,6 +62,22 @@ func InitAndPlanAndShowE(t testing.TestingT, options *Options) (string, error) {
 	return ShowE(t, options)
 }
 
+// InitAndPlanAndShowWithStructNoLog runs InitAndPlanAndShowWithStruct without logging and also by allocating a
+// temporary plan file destination that is discarded before returning the struct.
+func InitAndPlanAndShowWithStructNoLogTempPlanFile(t testing.TestingT, options *Options) *PlanStruct {
+	oldLogger := options.Logger
+	options.Logger = logger.Discard
+	defer func() { options.Logger = oldLogger }()
+
+	tmpFile, err := ioutil.TempFile("", "terratest-plan-file-")
+	require.NoError(t, err)
+	require.NoError(t, tmpFile.Close())
+	defer require.NoError(t, os.Remove(tmpFile.Name()))
+
+	options.PlanFilePath = tmpFile.Name()
+	return InitAndPlanAndShowWithStruct(t, options)
+}
+
 // InitAndPlanAndShowWithStruct runs terraform init, then terraform plan, and then terraform show with the given
 // options, and parses the json result into a go struct. This will fail the test if there is an error in the command.
 func InitAndPlanAndShowWithStruct(t testing.TestingT, options *Options) *PlanStruct {

modules/terraform/plan_test.go

@@ -84,6 +84,22 @@ func TestInitAndPlanWithPlanFile(t *testing.T) {
 	assert.FileExists(t, planFilePath, "Plan file was not saved to expected location:", planFilePath)
 }
 
+func TestInitAndPlanAndShowWithStructNoLogTempPlanFile(t *testing.T) {
+	t.Parallel()
+
+	testFolder, err := files.CopyTerraformFolderToTemp("../../test/fixtures/terraform-basic-configuration", t.Name())
+	require.NoError(t, err)
+
+	options := &Options{
+		TerraformDir: testFolder,
+		Vars: map[string]interface{}{
+			"cnt": 1,
+		},
+	}
+	planStruct := InitAndPlanAndShowWithStructNoLogTempPlanFile(t, options)
+	assert.Equal(t, 1, len(planStruct.ResourceChangesMap))
+}
+
 func TestPlanWithExitCodeWithNoChanges(t *testing.T) {
 	t.Parallel()
 	testFolder, err := files.CopyTerraformFolderToTemp("../../test/fixtures/terraform-no-error", t.Name())