Make tests pass.

probe/docker/registry_test.go

@@ -56,6 +56,10 @@ func (c *mockContainer) GetNode(_ string, _ []net.IP) report.Node {
 	})
 }
 
+func (c *mockContainer) Container() *client.Container {
+	return c.c
+}
+
 func (c *mockContainer) HasTTY() bool { return true }
 
 type mockDockerClient struct {

probe/docker/tagger_test.go

@@ -23,6 +23,10 @@ func (m *mockProcessTree) GetParent(pid int) (int, error) {
 	return parent, nil
 }
 
+func (m *mockProcessTree) GetChildren(int) ([]int, error) {
+	panic("Not implemented")
+}
+
 func TestTagger(t *testing.T) {
 	oldProcessTree := docker.NewProcessTreeStub
 	defer func() { docker.NewProcessTreeStub = oldProcessTree }()