diff --git a/tests/syntax-tests/highlighted/Graphviz DOT/test_digraph.dot b/tests/syntax-tests/highlighted/Graphviz DOT/test_digraph.dot
new file mode 100644
index 00000000..dddc1366
--- /dev/null
+++ b/tests/syntax-tests/highlighted/Graphviz DOT/test_digraph.dot	
@@ -0,0 +1,41 @@
+digraph {
+	label = <Label <font color='red'><b>formating</b></font>,<br/> test <font point-size='20'>is</font> done<br/> here <i>now.</i>>;
+
+	node [shape=box]
+	rankdir=LR
+	margin=0.1
+	a->b
+
+	// http://www.graphviz.org/doc/info/colors.html
+	// note: style=filled!
+	node [shape=box colorscheme=paired12 style=filled]
+	margin=0.1
+	a2[fillcolor=1]
+	b2[fillcolor=3]
+	a2->b2->x2
+
+	// http://www.graphviz.org/doc/info/colors.html
+	// note: style=filled!
+	node [shape=box colorscheme=paired12 style=filled]
+	rankdir=LR
+	margin=0.1
+	c1[fillcolor=1]
+	c2[fillcolor=2]
+	c3[fillcolor=3]
+	c4[fillcolor=4]
+	c5[fillcolor=5]
+	c6[fillcolor=6]
+	c7[fillcolor=7]
+	c8[fillcolor=8]
+	c9[fillcolor=9]
+	c10[fillcolor=10]
+	c11[fillcolor=11]
+	c12[fillcolor=12]
+	c->{c1 c3 c5 c7 c9 c11}
+	c1->c2
+	c3->c4
+	c5->c6
+	c7->c8
+	c9->c10
+	c11->c12
+}
diff --git a/tests/syntax-tests/highlighted/Graphviz DOT/test_graph.dot b/tests/syntax-tests/highlighted/Graphviz DOT/test_graph.dot
new file mode 100644
index 00000000..205c2981
--- /dev/null
+++ b/tests/syntax-tests/highlighted/Graphviz DOT/test_graph.dot	
@@ -0,0 +1,3 @@
+graph {
+	a--b
+}
diff --git a/tests/syntax-tests/source/Graphviz DOT/LICENSE.md b/tests/syntax-tests/source/Graphviz DOT/LICENSE.md
new file mode 100644
index 00000000..3f166cbe
--- /dev/null
+++ b/tests/syntax-tests/source/Graphviz DOT/LICENSE.md	
@@ -0,0 +1,22 @@
+The files `test_digraph.dot` and `test_graph.dot` are modified versions the files from https://github.com/scriptum/graphviz-examples/tree/a7762875efa32f90f6f1a37d866b2c26d362202a under the following license:
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Pavel Roschin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/tests/syntax-tests/source/Graphviz DOT/test_digraph.dot b/tests/syntax-tests/source/Graphviz DOT/test_digraph.dot
new file mode 100644
index 00000000..11e383b4
--- /dev/null
+++ b/tests/syntax-tests/source/Graphviz DOT/test_digraph.dot	
@@ -0,0 +1,41 @@
+digraph {
+	label = <Label <font color='red'><b>formating</b></font>,<br/> test <font point-size='20'>is</font> done<br/> here <i>now.</i>>;
+
+	node [shape=box]
+	rankdir=LR
+	margin=0.1
+	a->b
+
+	// http://www.graphviz.org/doc/info/colors.html
+	// note: style=filled!
+	node [shape=box colorscheme=paired12 style=filled]
+	margin=0.1
+	a2[fillcolor=1]
+	b2[fillcolor=3]
+	a2->b2->x2
+
+	// http://www.graphviz.org/doc/info/colors.html
+	// note: style=filled!
+	node [shape=box colorscheme=paired12 style=filled]
+	rankdir=LR
+	margin=0.1
+	c1[fillcolor=1]
+	c2[fillcolor=2]
+	c3[fillcolor=3]
+	c4[fillcolor=4]
+	c5[fillcolor=5]
+	c6[fillcolor=6]
+	c7[fillcolor=7]
+	c8[fillcolor=8]
+	c9[fillcolor=9]
+	c10[fillcolor=10]
+	c11[fillcolor=11]
+	c12[fillcolor=12]
+	c->{c1 c3 c5 c7 c9 c11}
+	c1->c2
+	c3->c4
+	c5->c6
+	c7->c8
+	c9->c10
+	c11->c12
+}
diff --git a/tests/syntax-tests/source/Graphviz DOT/test_graph.dot b/tests/syntax-tests/source/Graphviz DOT/test_graph.dot
new file mode 100644
index 00000000..34eb0c57
--- /dev/null
+++ b/tests/syntax-tests/source/Graphviz DOT/test_graph.dot	
@@ -0,0 +1,3 @@
+graph {
+	a--b
+}