diff --git a/models/graph.go b/models/graph.go
index 4e4e2c9..0683b22 100644
--- a/models/graph.go
+++ b/models/graph.go
@@ -106,7 +106,7 @@ func (builder *GraphBuilder) Extract() ([]*GraphNode, []*GraphLink) {
 			if linkPart[1] == node.NodeID {
 				link.Target = i
 				both++
-				break
+				continue
 			}
 		}
 		if both == 2 {
diff --git a/models/graph_test.go b/models/graph_test.go
index 4c03932..816e211 100644
--- a/models/graph_test.go
+++ b/models/graph_test.go
@@ -1,19 +1,62 @@
 package models
 
 import (
+	"encoding/json"
+	"io/ioutil"
 	"testing"
 
+	"github.com/FreifunkBremen/respond-collector/data"
 	"github.com/stretchr/testify/assert"
 )
 
+type TestNode struct {
+	Nodeinfo   *data.NodeInfo   `json:"nodeinfo"`
+	Neighbours *data.Neighbours `json:"neighbours"`
+}
+
 func TestGenerateGraph(t *testing.T) {
 	assert := assert.New(t)
+	nodes := testGetNodesByFile("node1.json", "node2.json", "node3.json")
+
+	graph := nodes.BuildGraph()
+	assert.NotNil(graph)
+	assert.Equal(1, graph.Version, "Wrong Version")
+	assert.NotNil(graph.Batadv, "no Batadv")
+	assert.Equal(false, graph.Batadv.Directed, "directed batadv")
+	assert.Equal(3, len(graph.Batadv.Nodes), "wrong Nodes count")
+	assert.Equal(2, len(graph.Batadv.Links), "wrong Links count")
+	// TODO more tests required
+}
+
+func testGetNodesByFile(files ...string) *Nodes {
 
 	nodes := &Nodes{
 		List: make(map[string]*Node),
 	}
 
-	graph := nodes.BuildGraph()
-	assert.NotNil(graph)
-	// TODO more tests required
+	for _, file := range files {
+		nodes.List[file] = testGetNodeByFile(file)
+	}
+
+	return nodes
+}
+
+func testGetNodeByFile(filename string) *Node {
+	testnode := &TestNode{}
+	testfile(filename, testnode)
+	return &Node{
+		Nodeinfo:   testnode.Nodeinfo,
+		Neighbours: testnode.Neighbours,
+	}
+}
+
+func testfile(name string, obj interface{}) {
+	file, err := ioutil.ReadFile("testdata/" + name)
+	if err != nil {
+		panic(err)
+	}
+
+	if err := json.Unmarshal(file, obj); err != nil {
+		panic(err)
+	}
 }
diff --git a/models/testdata/node1.json b/models/testdata/node1.json
new file mode 100644
index 0000000..379e5b9
--- /dev/null
+++ b/models/testdata/node1.json
@@ -0,0 +1,25 @@
+{
+	"nodeinfo":{
+		"node_id":"node1.json",
+		"network":{
+			"mesh":{
+				"bat0":{
+					"interfaces":{
+						"wireless":["a"]
+					}
+				}
+			}
+		}
+	},
+	"neighbours":{
+		"batadv":{
+			"a":{
+					"neighbours":{
+						"b":{"tq":250,"lastseen":0.42},
+						"c":{"tq":250,"lastseen":0.42}
+					}
+				}
+		}
+	}
+
+}
diff --git a/models/testdata/node2.json b/models/testdata/node2.json
new file mode 100644
index 0000000..de1b546
--- /dev/null
+++ b/models/testdata/node2.json
@@ -0,0 +1,24 @@
+{
+	"nodeinfo":{
+		"node_id":"node2.json",
+		"network":{
+			"mesh":{
+				"bat0":{
+					"interfaces":{
+						"wireless":["b"]
+					}
+				}
+			}
+		}
+	},
+	"neighbours":{
+		"batadv":{
+			"b":{
+					"neighbours":{
+						"a":{"tq":150,"lastseen":0.42}
+					}
+				}
+		}
+	}
+
+}
diff --git a/models/testdata/node3.json b/models/testdata/node3.json
new file mode 100644
index 0000000..7dcabd3
--- /dev/null
+++ b/models/testdata/node3.json
@@ -0,0 +1,24 @@
+{
+	"nodeinfo":{
+		"node_id":"node3.json",
+		"network":{
+			"mesh":{
+				"bat0":{
+					"interfaces":{
+						"wireless":["c"]
+					}
+				}
+			}
+		}
+	},
+	"neighbours":{
+		"batadv":{
+			"c":{
+					"neighbours":{
+						"a":{"tq":200,"lastseen":0.42}
+					}
+				}
+		}
+	}
+
+}