Use terraform in CLI to create QEMU cluster (#172)

* Use terraform in CLI to create QEMU cluster

* Dont allow qemu creation on os/arch other than linux/amd64

* Allow usage of --name flag for QEMU resources

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

cli/internal/terraform/loader_test.go

@@ -0,0 +1,62 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package terraform
+
+import (
+	"io/fs"
+	"testing"
+
+	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLoader(t *testing.T) {
+	testCases := map[string]struct {
+		provider cloudprovider.Provider
+		fileList []string
+	}{
+		"qemu": {
+			provider: cloudprovider.QEMU,
+			fileList: []string{
+				"main.tf",
+				"variables.tf",
+				"outputs.tf",
+				"modules",
+			},
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+			require := require.New(t)
+
+			file := file.NewHandler(afero.NewMemMapFs())
+
+			err := prepareWorkspace(file, tc.provider)
+			require.NoError(err)
+
+			checkFiles(t, file, func(err error) { assert.NoError(err) }, tc.fileList)
+
+			err = cleanUpWorkspace(file, tc.provider)
+			require.NoError(err)
+
+			checkFiles(t, file, func(err error) { assert.ErrorIs(err, fs.ErrNotExist) }, tc.fileList)
+		})
+	}
+}
+
+func checkFiles(t *testing.T, file file.Handler, assertion func(error), files []string) {
+	t.Helper()
+	for _, f := range files {
+		_, err := file.Stat(f)
+		assertion(err)
+	}
+}