Add tests for IOError raising

test/test_io.py

@@ -0,0 +1,31 @@
+import unittest
+
+from test.pattern_for_tests import *
+
+
+class TestExplicitIOErrors(unittest.TestCase):
+    def test_read_non_file(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        file1 = "nosuchfile.dst"
+        self.assertRaises(IOError, lambda: EmbPattern(file1))
+
+    def test_write_non_supported(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        pattern = get_simple_pattern()
+        file1 = "nosuchfile.pdf"
+        self.assertRaises(IOError, lambda: pattern.write(file1))
+
+    def test_write_no_writer(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        pattern = get_simple_pattern()
+        file1 = "nosuchfile.dat"
+        self.assertRaises(IOError, lambda: pattern.write(file1))