make store a struct and add tests

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

dagger/store_test.go

@@ -0,0 +1,37 @@
+package dagger
+
+import (
+	"context"
+	"errors"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestStore(t *testing.T) {
+	ctx := context.TODO()
+
+	root, err := os.MkdirTemp(os.TempDir(), "dagger-*")
+	require.NoError(t, err)
+	store := NewStore(root)
+
+	_, err = store.LookupRoute(ctx, "notexist", nil)
+	require.Error(t, err)
+	require.True(t, errors.Is(err, os.ErrNotExist))
+
+	r, err := store.CreateRoute(ctx, "test", nil)
+	require.NoError(t, err)
+	require.NotNil(t, r)
+	require.Equal(t, "test", r.Name())
+
+	r, err = store.LookupRoute(ctx, "test", nil)
+	require.NoError(t, err)
+	require.NotNil(t, r)
+	require.Equal(t, "test", r.Name())
+
+	routes, err := store.ListRoutes(ctx)
+	require.NoError(t, err)
+	require.Len(t, routes, 1)
+	require.Equal(t, "test", routes[0])
+}