FIX: Travis-CI fails due to no QT5

Updated travis-ci to include pyqt5 and QT5

.travis.yml

@@ -28,9 +28,14 @@ install:
 - conda create --yes -q -n test_environment python=$TRAVIS_PYTHON_VERSION nomkl pip
   setuptools cython numpy=$NUMPY_VERSION scipy=$SCIPY_VERSION nose matplotlib=$MATPLOTLIB_VERSION
   six mock h5py
+- conda install --yes -q -c https://conda.anaconda.org/dsdale24 pyqt5
 - source activate test_environment
 - pip install pep8 python-coveralls codecov
 - pip install -e . -q --no-deps
+before_script: # configure a headless display to test plot generation
+- "export DISPLAY=:99.0"
+- "sh -e /etc/init.d/xvfb start"
+- sleep 3 # give xvfb some time to start
 script:
 - nosetests --with-coverage --cover-package=neutronpy --logging-level=INFO
 after_success:

neutronpy/__init__.py

@@ -11,9 +11,13 @@
 from . import spurion
 from . import lattice
 from . import io
-from . import gui
 from .kmpfit import Fitter
 from .energy import Energy
 from .data import Data
 
+try:
+    from . import gui
+except ImportError:
+    print('Warning: PyQt5 not found, cannot run Resolution GUI')
+
 __version__ = '1.0.0b1'

tests/test_data.py

@@ -7,12 +7,12 @@
 import unittest
 from mock import patch
 from matplotlib import use
+use('Agg')
 import numpy as np
 from scipy.integrate import simps
 from neutronpy import Energy, Data, functions
 from neutronpy.io import load_data, save_data, detect_filetype
 from neutronpy.constants import BOLTZMANN_IN_MEV_K
-use('Agg')
 
 
 def build_data(clean=True):

tests/test_resolution.py

@@ -7,12 +7,12 @@
 import unittest
 from mock import patch
 from matplotlib import use
+use('Agg')
 import numpy as np
 from neutronpy import instrument
 from neutronpy.io import load_instrument
 from neutronpy.sample import Sample
 from neutronpy.instrument_tools import get_bragg_widths, fproject
-use('Agg')
 
 
 def angle2(x, y, z, h, k, l, lattice):

tests/test_structure_factors.py

@@ -6,9 +6,9 @@
 import numpy as np
 from mock import patch
 from matplotlib import use
+use('Agg')
 from neutronpy.material import Material
 from neutronpy.structure_factors import MagneticFormFactor
-use('Agg')
 
 
 class StructureFactor(unittest.TestCase):