diff --git a/render/selectors_test.go b/render/selectors_test.go
new file mode 100644
index 000000000..ee01e983b
--- /dev/null
+++ b/render/selectors_test.go
@@ -0,0 +1,62 @@
+package render_test
+
+import (
+	"testing"
+
+	"github.com/weaveworks/scope/render"
+	"github.com/weaveworks/scope/report"
+	"github.com/weaveworks/scope/test"
+	"github.com/weaveworks/scope/test/reflect"
+)
+
+func TestMakeRenderableNodes(t *testing.T) {
+
+	var (
+		newu64     = func(value uint64) *uint64 { return &value }
+		srcNodeID  = "srcNode"
+		dstNode1ID = "dstNode1"
+		dstNode2ID = "dstNode2"
+		srcNode    = report.MakeNode().
+				WithEdge(dstNode1ID, report.EdgeMetadata{EgressPacketCount: newu64(100), EgressByteCount: newu64(1000)}).
+				WithEdge(dstNode2ID, report.EdgeMetadata{EgressPacketCount: newu64(200), EgressByteCount: newu64(2000)})
+		dstNode1 = report.MakeNode()
+		dstNode2 = report.MakeNode()
+		topology = report.MakeTopology().
+				AddNode(srcNodeID, srcNode).
+				AddNode(dstNode1ID, dstNode1).
+				AddNode(dstNode2ID, dstNode2)
+	)
+
+	result := render.MakeRenderableNodes(topology)
+	mustLookup := func(id string) render.RenderableNode {
+		node, ok := result[id]
+		if !ok {
+			t.Fatalf("Expected result to contain node: %q, got: %v", id, result)
+		}
+		return node
+	}
+
+	// Source nodes should have the flattened edge metadata
+	{
+		have := mustLookup(srcNodeID).EdgeMetadata
+		want := report.EdgeMetadata{EgressPacketCount: newu64(300), EgressByteCount: newu64(3000)}
+		if !reflect.DeepEqual(want, have) {
+			t.Errorf(test.Diff(want, have))
+		}
+	}
+
+	// Result destination nodes should have the reverse of the source nodes
+	{
+		have := mustLookup(dstNode1ID).EdgeMetadata
+		want := report.EdgeMetadata{IngressPacketCount: newu64(100), IngressByteCount: newu64(1000)}
+		if !reflect.DeepEqual(want, have) {
+			t.Errorf(test.Diff(want, have))
+		}
+
+		have = mustLookup(dstNode2ID).EdgeMetadata
+		want = report.EdgeMetadata{IngressPacketCount: newu64(200), IngressByteCount: newu64(2000)}
+		if !reflect.DeepEqual(want, have) {
+			t.Errorf(test.Diff(want, have))
+		}
+	}
+}