1 files changed, 113 insertions, 0 deletions
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
new file mode 100644
index 0000000..0f04fbf
--- /dev/null
+++ b/tests/test_plugins.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import codecs
+import os
+import unittest
+
+from treelib import Tree
+from treelib.plugins import export_to_dot
+
+
+class DotExportCase(unittest.TestCase):
+    """Test class for the export to dot format function"""
+
+    def setUp(self):
+        tree = Tree()
+        tree.create_node("Hárry", "hárry")
+        tree.create_node("Jane", "jane", parent="hárry")
+        tree.create_node("Bill", "bill", parent="hárry")
+        tree.create_node("Diane", "diane", parent="jane")
+        tree.create_node("George", "george", parent="bill")
+        self.tree = tree
+
+    def read_generated_output(self, filename):
+        output = codecs.open(filename, "r", "utf-8")
+        generated = output.read()
+        output.close()
+
+        return generated
+
+    def test_export_to_dot(self):
+        export_to_dot(self.tree, "tree.dot")
+        expected = """\
+digraph tree {
+\t"hárry" [label="Hárry", shape=circle]
+\t"bill" [label="Bill", shape=circle]
+\t"jane" [label="Jane", shape=circle]
+\t"george" [label="George", shape=circle]
+\t"diane" [label="Diane", shape=circle]
+
+\t"hárry" -> "jane"
+\t"hárry" -> "bill"
+\t"bill" -> "george"
+\t"jane" -> "diane"
+}"""
+
+        self.assertTrue(
+            os.path.isfile("tree.dot"), "The file tree.dot could not be found."
+        )
+        generated = self.read_generated_output("tree.dot")
+
+        self.assertEqual(
+            generated, expected, "Generated dot tree is not the expected one"
+        )
+        os.remove("tree.dot")
+
+    def test_export_to_dot_empty_tree(self):
+        empty_tree = Tree()
+        export_to_dot(empty_tree, "tree.dot")
+
+        expected = """\
+digraph tree {
+}"""
+        self.assertTrue(
+            os.path.isfile("tree.dot"), "The file tree.dot could not be found."
+        )
+        generated = self.read_generated_output("tree.dot")
+
+        self.assertEqual(
+            expected, generated, "The generated output for an empty tree is not empty"
+        )
+        os.remove("tree.dot")
+
+    def test_unicode_filename(self):
+        tree = Tree()
+        tree.create_node("Node 1", "node_1")
+        export_to_dot(tree, "ŕʩϢ.dot")
+
+        expected = """\
+digraph tree {
+\t"node_1" [label="Node 1", shape=circle]
+}"""
+        self.assertTrue(
+            os.path.isfile("ŕʩϢ.dot"), "The file ŕʩϢ.dot could not be found."
+        )
+        generated = self.read_generated_output("ŕʩϢ.dot")
+        self.assertEqual(
+            expected, generated, "The generated file content is not the expected one"
+        )
+        os.remove("ŕʩϢ.dot")
+
+    def test_export_with_minus_in_filename(self):
+        tree = Tree()
+        tree.create_node("Example Node", "example-node")
+        expected = """\
+digraph tree {
+\t"example-node" [label="Example Node", shape=circle]
+}"""
+
+        export_to_dot(tree, "id_with_minus.dot")
+        self.assertTrue(
+            os.path.isfile("id_with_minus.dot"),
+            "The file id_with_minus.dot could not be found.",
+        )
+        generated = self.read_generated_output("id_with_minus.dot")
+        self.assertEqual(
+            expected, generated, "The generated file content is not the expected one"
+        )
+        os.remove("id_with_minus.dot")
+
+    def tearDown(self):
+        self.tree = None