interfaces: add test that checks when app set is made with components…

… from the wrong snap

interfaces/snap_app_set_test.go

@@ -4,6 +4,7 @@ import (
 	"github.com/snapcore/snapd/dirs"
 	"github.com/snapcore/snapd/interfaces"
 	"github.com/snapcore/snapd/snap"
+	"github.com/snapcore/snapd/snap/naming"
 	"github.com/snapcore/snapd/snap/snaptest"
 	"github.com/snapcore/snapd/testutil"
 	. "gopkg.in/check.v1"
@@ -261,6 +262,14 @@ func (s *snapAppSetSuite) TestInstanceName(c *C) {
 	c.Check(set.InstanceName(), Equals, "test-snap")
 }
 
+func (s *snapAppSetSuite) TestNewAppSetWithWrongComponent(c *C) {
+	info := snaptest.MockInfo(c, yaml, nil)
+	_, err := interfaces.NewSnapAppSet(info, []*snap.ComponentInfo{{
+		Component: naming.NewComponentRef("other-name", "comp"),
+	}})
+	c.Assert(err, ErrorMatches, `internal error: snap "test-snap" does not own component "other-name\+comp"`)
+}
+
 func appsInMap(apps map[string]*snap.AppInfo) []*snap.AppInfo {
 	result := make([]*snap.AppInfo, 0, len(apps))
 	for _, app := range apps {