fix function args and add test

ticker.go

@@ -6,12 +6,12 @@ import (
 
 type CallTicker struct {
 	manualTrigger chan interface{}
-	function      func(...interface{}) interface{}
+	function      func()
 	ticker        *time.Ticker
 	duration      time.Duration
 }
 
-func NewCallTicker(d time.Duration, function func(...interface{}) interface{}) *CallTicker {
+func NewCallTicker(d time.Duration, function func()) *CallTicker {
 	ticker := &CallTicker{
 		manualTrigger: make(chan interface{}),
 		function:      function,

ticker_test.go

@@ -0,0 +1,31 @@
+package callticker
+
+import (
+	"testing"
+	"time"
+)
+
+func TestTicker(t *testing.T) {
+	num := 0
+
+	incr := func() {
+		num += 1
+	}
+
+	ticker := NewCallTicker(time.Millisecond*50, incr)
+	go ticker.Run()
+
+	time.Sleep(time.Millisecond * 275)
+
+	if num != 5 {
+		t.Errorf("expected 5 calls by now")
+	}
+
+	ticker.Stop()
+
+	time.Sleep(time.Millisecond * 100)
+
+	if num != 5 {
+		t.Errorf("expected calls to stop")
+	}
+}