diff --git a/tests/sources/test08_2.gv b/tests/sources/test08_2.gv
new file mode 100644
index 0000000..93dcce6
--- /dev/null
+++ b/tests/sources/test08_2.gv
@@ -0,0 +1,5 @@
+graph {
+1 [label="(0, 0.5, 0.5)", pos="0.5,-0.5!"];
+2 [label="(0, 1.5, -0.5)", pos="-0.5,-1.5!"];
+1 -- 2 [fontsize=8, label="1.0"];
+}
diff --git a/tests/sources/test15_11.gv b/tests/sources/test15_11.gv
new file mode 100644
index 0000000..17328fa
--- /dev/null
+++ b/tests/sources/test15_11.gv
@@ -0,0 +1,30 @@
+digraph G {
+	size="6,6";
+	node [shape=circle,fontsize=8];
+	rankdir=LR;
+	9 -> 9 [label="11/1"];
+	9 -> 10 [label="10/1"];
+	8 -> 8 [label="10/1"];
+	8 -> 11 [label="00/-"];
+	7 -> 8 [label="10/1"];
+	7 -> 7 [label="00/1"];
+	6 -> 6 [label="01/1"];
+	6 -> 11 [label="00/-"];
+	5 -> 6 [label="01/1"];
+	5 -> 5 [label="11/1"];
+	4 -> 4 [label="01/1"];
+	4 -> 11 [label="00/-"];
+	3 -> 4 [label="01/1"];
+	3 -> 3 [label="00/1"];
+	2 -> 9 [label="11/1"];
+	2 -> 7 [label="00/1"];
+	2 -> 2 [label="01/1"];
+	10 -> 10 [label="10/1"];
+	10 -> 11 [label="00/-"];
+	1 -> 5 [label="11/1"];
+	1 -> 3 [label="00/1"];
+	1 -> 1 [label="10/1"];
+	11 -> 2 [label="01/-"];
+	11 -> 1 [label="10/-"];
+	11 -> 11 [label="00/0"];
+}
diff --git a/tests/sources/test16_12.gv b/tests/sources/test16_12.gv
new file mode 100644
index 0000000..62de27c
--- /dev/null
+++ b/tests/sources/test16_12.gv
@@ -0,0 +1,29 @@
+digraph simple {
+orientation=landscape;
+ratio=auto;
+size = "10,7.5";
+label="Task Hierarchy: model2";
+1 [shape=box,fontcolor=forestgreen];
+2 [shape=box];
+3 [shape=box];
+4 [shape=box];
+5 [shape=box];
+6 [shape=box];
+7 [shape=box];
+8 [shape=box];
+9 [shape=box];
+10 [shape=box];
+11 [shape=box];
+12 [shape=box];
+1 -> 2 [];
+1 -> 3 [];
+1 -> 4 [];
+1 -> 5 [];
+1 -> 6 [];
+1 -> 7 [];
+1 -> 8 [];
+1 -> 9 [];
+9 -> 10 [];
+9 -> 11 [];
+9 -> 12 [];
+}
diff --git a/tests/sources/test22_6.gv b/tests/sources/test22_6.gv
new file mode 100644
index 0000000..3b85593
--- /dev/null
+++ b/tests/sources/test22_6.gv
@@ -0,0 +1,10 @@
+digraph G {
+ 1 [shape=rectangle]
+ 2 [shape=none]
+ 3 [shape=note]
+ 4 [shape=tab]
+ 5 [shape=box3d]
+ 6 [shape=component]
+ 1  -> 2
+ 3  -> 4  -> 5  -> 6
+}