Implement the circumvention nettest group

Only Psiphon for now. Closes #87 #77.

nettests/groups.go

@@ -36,4 +36,10 @@ var NettestGroups = map[string]NettestGroup{
 			WhatsApp{},
 		},
 	},
+	"circumvention": NettestGroup{
+		Label: "Circumvention Tools",
+		Nettests: []Nettest{
+			Psiphon{},
+		},
+	},
 }

nettests/psiphon.go

@@ -0,0 +1,33 @@
+package nettests
+
+// Psiphon test implementation
+type Psiphon struct {
+}
+
+// Run starts the test
+func (h Psiphon) Run(ctl *Controller) error {
+	builder, err := ctl.Ctx.Session.NewExperimentBuilder(
+		"psiphon",
+	)
+	if err != nil {
+		return err
+	}
+	return ctl.Run(builder, []string{""})
+}
+
+// PsiphonTestKeys contains the test keys
+type PsiphonTestKeys struct {
+	IsAnomaly bool `json:"-"`
+}
+
+// GetTestKeys generates a summary for a test run
+func (h Psiphon) GetTestKeys(tk map[string]interface{}) (interface{}, error) {
+	return PsiphonTestKeys{
+		IsAnomaly: tk["failure"] != nil,
+	}, nil
+}
+
+// LogSummary writes the summary to the standard output
+func (h Psiphon) LogSummary(s string) error {
+	return nil
+}