Add metadata functions unit test

tfexec/metadata_functions_test.go

@@ -0,0 +1,29 @@
+package tfexec
+
+import (
+	"context"
+	"testing"
+
+	"github.com/hashicorp/terraform-exec/tfexec/internal/testutil"
+)
+
+func TestMetadataFunctionsCmd(t *testing.T) {
+	td := t.TempDir()
+
+	tf, err := NewTerraform(td, tfVersion(t, testutil.Latest_v1_1))
+	// tf, err := NewTerraform(td, tfVersion(t, testutil.Latest_v1_4)) // TODO! enable after 1.4 release
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// empty env, to avoid environ mismatch in testing
+	tf.SetEnv(map[string]string{})
+
+	functionsCmd := tf.metadataFunctionsCmd(context.Background())
+
+	assertCmd(t, []string{
+		"metadata",
+		"functions",
+		"-json",
+	}, nil, functionsCmd)
+}