[MRG] Add error/warning tests (#113)

* Add unknown flavor test

* Add input kwargs test

* Remove unused utils

* Add unsupported format test

* Add stream unequal tables-columns length test

* Add python3 compat

* Add no tables found test

* Convert util info log to warning

tests/files/foo.csv

@@ -0,0 +1,2 @@
+"a","b"
+"1","2"

tests/test_cli.py

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+# -*- coding: utf-8 -*-

tests/test_errors.py

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+# -*- coding: utf-8 -*-
+
+import os
+import warnings
+
+import pytest
+
+import camelot
+
+
+testdir = os.path.dirname(os.path.abspath(__file__))
+testdir = os.path.join(testdir, "files")
+filename = os.path.join(testdir, 'foo.pdf')
+
+
+def test_unknown_flavor():
+    message = ("Unknown flavor specified."
+               " Use either 'lattice' or 'stream'")
+    with pytest.raises(NotImplementedError, message=message):
+        tables = camelot.read_pdf(filename, flavor='chocolate')
+
+
+def test_input_kwargs():
+    message = "columns cannot be used with flavor='lattice'"
+    with pytest.raises(ValueError, message=message):
+        tables = camelot.read_pdf(filename, columns=['10,20,30,40'])
+
+
+def test_unsupported_format():
+    message = 'File format not supported'
+    filename = os.path.join(testdir, 'foo.csv')
+    with pytest.raises(NotImplementedError, message=message):
+        tables = camelot.read_pdf(filename)
+
+
+def test_stream_equal_length():
+    message = ("Length of table_area and columns"
+               " should be equal")
+    with pytest.raises(ValueError, message=message):
+        tables = camelot.read_pdf(filename, flavor='stream',
+            table_area=['10,20,30,40'], columns=['10,20,30,40', '10,20,30,40'])
+
+
+def test_no_tables_found():
+    filename = os.path.join(testdir, 'blank.pdf')
+    # TODO: use pytest.warns
+    with warnings.catch_warnings():
+        warnings.simplefilter('error')
+        try:
+            tables = camelot.read_pdf(filename)
+        except Exception as e:
+            assert type(e).__name__ == 'UserWarning'
+            assert str(e) == 'No tables found on page-1'

tests/test_plotting.py

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+# -*- coding: utf-8 -*-