Merge pull request #966 from rbuffat/fix_appveyor

Fix maint-1.8 appveyor

pytest.ini

@@ -0,0 +1,13 @@
+[pytest]
+filterwarnings =
+    ignore:.*Sequential read of iterator was interrupted*:RuntimeWarning
+    ignore:.*negative slices or start values other than zero may be slow*:RuntimeWarning
+    ignore:.*negative step size may be slow*:RuntimeWarning
+    ignore:.*is buggy and will be removed in Fiona 2.0.*
+
+markers = 
+    iconv: marks tests that require gdal to be compiled with iconv
+    network: marks tests that require a network connection
+    wheel: marks test that only works when installed from wheel
+
+testpaths = tests

requirements.txt

@@ -4,3 +4,4 @@ cligj==0.5.0
 munch==2.3.2
 six==1.11.0
 enum34==1.1.6 ; python_version < '3.4'
+certifi

tests/test_fio_load.py

@@ -5,6 +5,8 @@
 import os
 import shutil
 
+import pytest
+
 import fiona
 from fiona.fio.main import main_group
 
@@ -121,7 +123,8 @@ def test_fio_load_layer(tmpdir, runner):
         shutil.rmtree(outdir)
 
 
-def test_creation_optiona(tmpdir, runner, feature_seq):
+@pytest.mark.iconv
+def test_creation_options(tmpdir, runner, feature_seq):
     tmpfile = str(tmpdir.mkdir("tests").join("test.shp"))
     result = runner.invoke(
         main_group,