Try to test on windows:

- install openssl manually from Bitmessage/ThirdPartyLibraries
 - add empty 'Windows' dict into checkdeps.EXTRAS_REQUIRE_DEPS
 - build ext
 - allow fail

.travis.yml

@@ -12,6 +12,22 @@ addons:
       - python-qt4
       - tor
       - xvfb
+jobs:
+  allow_failures:
+    - os: windows
+  include:
+    - os: windows
+      language: shell
+      before_install:
+        - choco install python2
+        - choco install --ignore-dependencies vcpython27
+        - python -m pip install --upgrade pip
+        - wget -c -nc -nv --content-disposition https://github.com/Bitmessage/ThirdPartyLibraries/blob/master/Win64OpenSSL-1_0_2t.exe?raw=true
+        - powershell -Command "Start-Process -FilePath Win64OpenSSL-1_0_2t.exe -ArgumentList '/q /norestart /silent /verysilent /sp- /suppressmsgboxes /dir=C:\OpenSSL-Win64' -Wait"
+        - python setup.py build_ext --inplace
+      env:
+        - PATH=/c/Python27:/c/Python27/Scripts:$PATH
+        - OPENSSL_DIR="c:\\OpenSSL-Win64"
 install:
   - pip install -r requirements.txt
   - python setup.py install

checkdeps.py

@@ -51,6 +51,7 @@ EXTRAS_REQUIRE_DEPS = {
         "Fedora": ["prctl"],
         "Guix": [""],
         "Gentoo": ["dev-python/python-prctl"],
+        "Windows": [""]
     },
 }