add vars2file method so we can set complex type variable by using varfile

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/r3labs/diff/v3 v3.0.1
 	github.com/spf13/afero v1.9.5
 	github.com/stretchr/testify v1.8.3
+	github.com/thanhpk/randstr v1.0.6
 	github.com/timandy/routine v1.1.1
 	golang.org/x/mod v0.10.0
 	golang.org/x/oauth2 v0.8.0

go.sum

@@ -563,6 +563,8 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.3 h1:RP3t2pwF7cMEbC1dqtB6poj3niw/9gnV4Cjg5oW5gtY=
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/thanhpk/randstr v1.0.6 h1:psAOktJFD4vV9NEVb3qkhRSMvYh4ORRaj1+w/hn4B+o=
+github.com/thanhpk/randstr v1.0.6/go.mod h1:M/H2P1eNLZzlDwAzpkkkUvoyNNMbzRGhESZuEQk3r0U=
 github.com/timandy/routine v1.1.1 h1:6/Z7qLFZj3GrzuRksBFzIG8YGUh8CLhjnnMePBQTrEI=
 github.com/timandy/routine v1.1.1/go.mod h1:OZHPOKSvqL/ZvqXFkNZyit0xIVelERptYXdAHH00adQ=
 github.com/tmccombs/hcl2json v0.3.3 h1:+DLNYqpWE0CsOQiEZu+OZm5ZBImake3wtITYxQ8uLFQ=

variable_file.go

@@ -0,0 +1,27 @@
+package terraform_module_test_helper
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/thanhpk/randstr"
+)
+
+func VarsToFile(t *testing.T, vars map[string]any) string {
+	cleanPath := filepath.Clean(fmt.Sprintf("%s/terraform%s.tfvars.json", os.TempDir(), randstr.Hex(8)))
+	varFile, err := os.Create(cleanPath)
+	require.Nil(t, err)
+	c, err := json.Marshal(vars)
+	require.Nil(t, err)
+	_, err = varFile.Write(c)
+	require.Nil(t, err)
+	_ = varFile.Close()
+	varFilePath, err := filepath.Abs(cleanPath)
+	require.Nil(t, err)
+	return varFilePath
+}
+

variable_file_test.go

@@ -0,0 +1,29 @@
+package terraform_module_test_helper
+
+import (
+	"encoding/json"
+	"github.com/gruntwork-io/go-commons/files"
+	"github.com/stretchr/testify/assert"
+	"os"
+	"testing"
+)
+
+func TestVarsToFile(t *testing.T) {
+	vars := make(map[string]any, 0)
+	vars["number"] = 1.0
+	vars["string"] = "hello"
+	vars["object"] = map[string]any {
+		"key": "value",
+	}
+	path := VarsToFile(t, vars)
+	defer func() {
+		_ = os.Remove(path)
+	}()
+
+	content, err := files.ReadFileAsString(path)
+	assert.NoError(t, err)
+	actual := make(map[string]any, 0)
+	err = json.Unmarshal([]byte(content), &actual)
+	assert.NoError(t, err)
+	assert.Equal(t, vars, actual)
+}