improve test coverage

tests/test_book.py

@@ -20,6 +20,12 @@ def test_book_reader():
     reader.read_sheet(1)
 
 
+@raises(IOError)
+def test_book_reader_open_stream():
+    reader = BookReader()
+    reader.open_stream("a string")
+
+
 @raises(IOError)
 def test_book_writer():
     writer = BookWriter()

tests/test_io.py

@@ -113,6 +113,15 @@ def test_get_io():
     assert io is None
 
 
+def test_get_io_type():
+    t = manager.get_io_type("hello")
+    assert t is None
+    t = manager.get_io_type("csv")
+    eq_(t, 'string')
+    t = manager.get_io_type("xls")
+    eq_(t, 'bytes')
+
+
 def test_default_csv_format():
     data = [['1', '2', '3']]
     io = manager.get_io("csv")
@@ -189,6 +198,13 @@ def test_library_parameter():
     assert result['csv'] == [[1, 2, 3]]
 
 
+@raises(Exception)
+def test_library_parameter_error_situation():
+    data = [['1', '2', '3']]
+    io = manager.get_io("csv")
+    save_data(io, data, 'csv', library="doesnot-exist")
+
+
 def test_conversion_from_bytes_to_text():
     test_file = "conversion.csv"
     data = [['1', '2', '3']]

tests/test_sheet.py

@@ -13,3 +13,5 @@ def test_write_empty_array():
     writer = MyWriter(test_string, "somesheet", "somename")
     writer.write_array([])
     eq_(test_string, writer._native_book)
+
+