added test for image component parameters type

glymur/lib/openjp2.py

@@ -548,6 +548,13 @@ class ImageComptParmType(ctypes.Structure):
         # signed (1) / unsigned (0)
         ("sgnd",            ctypes.c_uint32)]
 
+    def __str__(self):
+        msg = "{0}:\n".format(self.__class__)
+        for field_name, _ in self._fields_:
+            msg += "    {0}: {1}\n".format(
+                field_name, getattr(self, field_name))
+        return msg
+
 
 class TccpInfo(ctypes.Structure):
     """Tile-component coding parameters information.

glymur/lib/test/fixtures.py

@@ -116,3 +116,14 @@ default_compression_parameters_type = """<class 'glymur.lib.openjp2.CompressionP
     mct_data: None
     max_cs_size: 0
     rsiz: 0"""
+
+default_image_component_parameters = """<class 'glymur.lib.openjp2.ImageComptParmType'>:
+    dx: 0
+    dy: 0
+    w: 0
+    h: 0
+    x0: 0
+    y0: 0
+    prec: 0
+    bpp: 0
+    sgnd: 0"""

glymur/lib/test/test_printing.py

@@ -54,4 +54,14 @@ class TestPrintingOpenjp2(unittest.TestCase):
         expected = fixtures.default_compression_parameters_type
         self.assertEqual(actual, expected)
 
+    def test_default_component_parameters(self):
+        """printing default image component parameters"""
+        icpt = glymur.lib.openjp2.ImageComptParmType()
+        with patch('sys.stdout', new=StringIO()) as fake_out:
+            print(icpt)
+            actual = fake_out.getvalue().strip()
+        expected = fixtures.default_image_component_parameters
+        self.assertEqual(actual, expected)
+
+