1 files changed, 170 insertions, 0 deletions
diff --git a/subcommand_test.go b/subcommand_test.go
new file mode 100644
index 0000000..25689a4
--- /dev/null
+++ b/subcommand_test.go
@@ -0,0 +1,170 @@
+package arg
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// This file contains tests for parse.go but I decided to put them here
+// since that file is getting large
+
+func TestSubcommandNotAPointer(t *testing.T) {
+	var args struct {
+		A string `arg:"subcommand"`
+	}
+	_, err := NewParser(Config{}, &args)
+	assert.Error(t, err)
+}
+
+func TestSubcommandNotAPointerToStruct(t *testing.T) {
+	var args struct {
+		A struct{} `arg:"subcommand"`
+	}
+	_, err := NewParser(Config{}, &args)
+	assert.Error(t, err)
+}
+
+func TestPositionalAndSubcommandNotAllowed(t *testing.T) {
+	var args struct {
+		A string   `arg:"positional"`
+		B struct{} `arg:"subcommand"`
+	}
+	_, err := NewParser(Config{}, &args)
+	assert.Error(t, err)
+}
+
+func TestMinimalSubcommand(t *testing.T) {
+	type listCmd struct {
+	}
+	var args struct {
+		List *listCmd `arg:"subcommand"`
+	}
+	err := parse("list", &args)
+	require.NoError(t, err)
+	assert.NotNil(t, args.List)
+}
+
+func TestNamedSubcommand(t *testing.T) {
+	type listCmd struct {
+	}
+	var args struct {
+		List *listCmd `arg:"subcommand:ls"`
+	}
+	err := parse("ls", &args)
+	require.NoError(t, err)
+	assert.NotNil(t, args.List)
+}
+
+func TestEmptySubcommand(t *testing.T) {
+	type listCmd struct {
+	}
+	var args struct {
+		List *listCmd `arg:"subcommand"`
+	}
+	err := parse("", &args)
+	require.NoError(t, err)
+	assert.Nil(t, args.List)
+}
+
+func TestTwoSubcommands(t *testing.T) {
+	type getCmd struct {
+	}
+	type listCmd struct {
+	}
+	var args struct {
+		Get  *getCmd  `arg:"subcommand"`
+		List *listCmd `arg:"subcommand"`
+	}
+	err := parse("list", &args)
+	require.NoError(t, err)
+	assert.Nil(t, args.Get)
+	assert.NotNil(t, args.List)
+}
+
+func TestSubcommandsWithOptions(t *testing.T) {
+	type getCmd struct {
+		Name string
+	}
+	type listCmd struct {
+		Limit int
+	}
+	type cmd struct {
+		Verbose bool
+		Get     *getCmd  `arg:"subcommand"`
+		List    *listCmd `arg:"subcommand"`
+	}
+
+	{
+		var args cmd
+		err := parse("list", &args)
+		require.NoError(t, err)
+		assert.Nil(t, args.Get)
+		assert.NotNil(t, args.List)
+	}
+
+	{
+		var args cmd
+		err := parse("list --limit 3", &args)
+		require.NoError(t, err)
+		assert.Nil(t, args.Get)
+		assert.NotNil(t, args.List)
+		assert.Equal(t, args.List.Limit, 3)
+	}
+
+	{
+		var args cmd
+		err := parse("list --limit 3 --verbose", &args)
+		require.NoError(t, err)
+		assert.Nil(t, args.Get)
+		assert.NotNil(t, args.List)
+		assert.Equal(t, args.List.Limit, 3)
+		assert.True(t, args.Verbose)
+	}
+
+	{
+		var args cmd
+		err := parse("list --verbose --limit 3", &args)
+		require.NoError(t, err)
+		assert.Nil(t, args.Get)
+		assert.NotNil(t, args.List)
+		assert.Equal(t, args.List.Limit, 3)
+		assert.True(t, args.Verbose)
+	}
+
+	{
+		var args cmd
+		err := parse("--verbose list --limit 3", &args)
+		require.NoError(t, err)
+		assert.Nil(t, args.Get)
+		assert.NotNil(t, args.List)
+		assert.Equal(t, args.List.Limit, 3)
+		assert.True(t, args.Verbose)
+	}
+
+	{
+		var args cmd
+		err := parse("get", &args)
+		require.NoError(t, err)
+		assert.NotNil(t, args.Get)
+		assert.Nil(t, args.List)
+	}
+
+	{
+		var args cmd
+		err := parse("get --name test", &args)
+		require.NoError(t, err)
+		assert.NotNil(t, args.Get)
+		assert.Nil(t, args.List)
+		assert.Equal(t, args.Get.Name, "test")
+	}
+}
+
+func TestNestedSubcommands(t *testing.T) {
+	// tree of subcommands
+}
+
+func TestSubcommandsWithPositionals(t *testing.T) {
+	// subcommands with positional arguments
+}