Move and Update test-data repo into pyqtgraph repo

To reduce complexity, and make it easier to add more images and tests,
the images in the `test-data` repository should be merged with the main
repository.  Furthermore, we can remove a lot of the subprocess work in
the image_testing.py file, as we no longer need to have it interact with
git.

The images are not the same.  Images were regenerated with Qt6, and now
have proper big and little endian handling thanks to @pijyoi

Second commit is a slightly modified variant of
2e135ab282d6007b34a3854921be54d0e9efb241 authored by @pijyoi
it is to convert qimages to RGBA8888 for testing.  Image
files were regenerated images for the big/little handling

Fixed issue with bogus test from test_NonUniformImage and generated a
new image

.github/workflows/main.yml

@@ -40,11 +40,6 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Checkout test-data
-      uses: actions/checkout@v2
-      with:
-        repository: pyqtgraph/test-data
-        path: .pyqtgraph/test-data
     - name: Setup Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
@@ -106,7 +101,7 @@ jobs:
     - name: Run Tests
       run: |
         mkdir $SCREENSHOT_DIR
-        pytest pyqtgraph examples -v \
+        pytest tests examples -v \
           --junitxml pytest.xml \
       shell: bash
     - name: Upload Screenshots

pyqtgraph/functions.py

@@ -1511,17 +1511,10 @@ def makeQImage(imgData, alpha=None, copy=True, transpose=True):
     return ndarray_to_qimage(imgData, imgFormat)
 
 
-def imageToArray(img, copy=False, transpose=True):
+def qimage_to_ndarray(qimg):
-    """
+    img_ptr = qimg.bits()
-    Convert a QImage into numpy array. The image must have format RGB32, ARGB32, or ARGB32_Premultiplied.
-    By default, the image is not copied; changes made to the array will appear in the QImage as well (beware: if 
-    the QImage is collected before the array, there may be trouble).
-    The array will have shape (width, height, (b,g,r,a)).
-    """
-    fmt = img.format()
-    img_ptr = img.bits()
 
-    if QT_LIB.startswith('PyQt'):
+    if hasattr(img_ptr, 'setsize'): # PyQt sip.voidptr
         # sizeInBytes() was introduced in Qt 5.10
         # however PyQt5 5.12 will fail with:
         #   "TypeError: QImage.sizeInBytes() is a private method"
@@ -1529,14 +1522,37 @@ def imageToArray(img, copy=False, transpose=True):
         #   PyQt5 5.15, PySide2 5.12, PySide2 5.15
         try:
             # 64-bits size
-            nbytes = img.sizeInBytes()
+            nbytes = qimg.sizeInBytes()
         except (TypeError, AttributeError):
             # 32-bits size
-            nbytes = img.byteCount()
+            nbytes = qimg.byteCount()
         img_ptr.setsize(nbytes)
 
-    arr = np.frombuffer(img_ptr, dtype=np.ubyte)
+    depth = qimg.depth()
-    arr = arr.reshape(img.height(), img.width(), 4)
+    if depth in (8, 24, 32):
+        dtype = np.uint8
+        nchan = depth // 8
+    elif depth in (16, 64):
+        dtype = np.uint16
+        nchan = depth // 16
+    else:
+        raise ValueError("Unsupported Image Type")
+    shape = qimg.height(), qimg.width()
+    if nchan != 1:
+        shape = shape + (nchan,)
+    return np.frombuffer(img_ptr, dtype=dtype).reshape(shape)
+
+
+def imageToArray(img, copy=False, transpose=True):
+    """
+    Convert a QImage into numpy array. The image must have format RGB32, ARGB32, or ARGB32_Premultiplied.
+    By default, the image is not copied; changes made to the array will appear in the QImage as well (beware: if
+    the QImage is collected before the array, there may be trouble).
+    The array will have shape (width, height, (b,g,r,a)).
+    """
+    arr = qimage_to_ndarray(img)
+
+    fmt = img.format()
     if fmt == img.Format_RGB32:
         arr[...,3] = 255
     

pytest.ini

@@ -4,7 +4,7 @@ xvfb_height = 1080
 # use this due to some issues with ndarray reshape errors on CI systems
 xvfb_colordepth = 24
 xvfb_args=-ac +extension GLX +render
-faulthandler_timeout = 30
+faulthandler_timeout = 60
 
 filterwarnings =
     # re-enable standard library warnings

tests/graphicsItems/test_ImageItem.py

@@ -5,7 +5,7 @@ import pytest
 from pyqtgraph.Qt import QtCore, QtGui, QtTest
 import numpy as np
 import pyqtgraph as pg
-from pyqtgraph.tests import assertImageApproved, TransposedImageItem
+from tests.image_testing import assertImageApproved, TransposedImageItem
 try:
     import cupy
 except ImportError:

tests/graphicsItems/test_InfiniteLine.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 import pyqtgraph as pg
 from pyqtgraph.Qt import QtGui, QtCore, QtTest
-from pyqtgraph.tests import mouseDrag, mouseMove
+from tests.ui_testing import mouseDrag, mouseMove
 pg.mkQApp()
 
 

tests/graphicsItems/test_NonUniformImage.py

@@ -2,7 +2,7 @@ import numpy as np
 import pyqtgraph as pg
 from pyqtgraph.Qt import QtTest
 from pyqtgraph.graphicsItems.NonUniformImage import NonUniformImage
-from pyqtgraph.tests import assertImageApproved
+from tests.image_testing import assertImageApproved
 from pyqtgraph.colormap import ColorMap
 import pyqtgraph.functions as fn
 import pytest
@@ -93,7 +93,7 @@ def test_NonUniformImage_colormap():
 
     image = NonUniformImage(x, y, Z, border=fn.mkPen('g'))
 
-    cmap = ColorMap(pos=[0.0, 1.0], color=[(0.0, 0.0, 0.0, 1.0), (1.0, 1.0, 1.0, 1.0)])
+    cmap = ColorMap(pos=[0.0, 1.0], color=[(0, 0, 0), (255, 255, 255)])
     image.setColorMap(cmap)
 
     viewbox.addItem(image)

tests/graphicsItems/test_PlotCurveItem.py

@@ -1,6 +1,6 @@
 import numpy as np
 import pyqtgraph as pg
-from pyqtgraph.tests import assertImageApproved
+from tests.image_testing import assertImageApproved
 
 
 def test_PlotCurveItem():

tests/graphicsItems/test_ROI.py

@@ -3,9 +3,10 @@ import sys
 import numpy as np
 import pytest
 import pyqtgraph as pg
+import platform
 from pyqtgraph.Qt import QtCore, QtGui, QtTest
-from pyqtgraph.tests import assertImageApproved, mouseMove, mouseDrag, mouseClick, TransposedImageItem, resizeWindow
+from tests.image_testing import assertImageApproved
-import pytest
+from tests.ui_testing import mouseMove, mouseDrag, mouseClick, resizeWindow
 
 app = pg.mkQApp()
 pg.setConfigOption("mouseRateLimit", 0)
@@ -39,17 +40,20 @@ def test_getArrayRegion_axisorder():
 
     
 def check_getArrayRegion(roi, name, testResize=True, transpose=False):
+    # on windows, edges corner pixels seem to be slightly different from other platforms
+    # giving a pxCount=2 for a fudge factor
+    if isinstance(roi, (pg.ROI, pg.RectROI)) and platform.system() == "Windows":
+        pxCount = 2
+    else:
+        pxCount=-1
+
+
     initState = roi.getState()
     
-    #win = pg.GraphicsLayoutWidget()
     win = pg.GraphicsView()
     win.show()
     resizeWindow(win, 200, 400)
     # Don't use Qt's layouts for testing--these generate unpredictable results.    
-    #vb1 = win.addViewBox()
-    #win.nextRow()
-    #vb2 = win.addViewBox()
-    
     # Instead, place the viewboxes manually 
     vb1 = pg.ViewBox()
     win.scene().addItem(vb1)
@@ -97,7 +101,7 @@ def check_getArrayRegion(roi, name, testResize=True, transpose=False):
     vb2.enableAutoRange(True, True)
     
     app.processEvents()
-    assertImageApproved(win, name+'/roi_getarrayregion', 'Simple ROI region selection.')
+    assertImageApproved(win, name+'/roi_getarrayregion', 'Simple ROI region selection.', pxCount=pxCount)
 
     with pytest.raises(TypeError):
         roi.setPos(0, False)
@@ -106,38 +110,33 @@ def check_getArrayRegion(roi, name, testResize=True, transpose=False):
     rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
     img2.setImage(rgn[0, ..., 0])
     app.processEvents()
-    assertImageApproved(win, name+'/roi_getarrayregion_halfpx', 'Simple ROI region selection, 0.5 pixel shift.')
+    assertImageApproved(win, name+'/roi_getarrayregion_halfpx', 'Simple ROI region selection, 0.5 pixel shift.', pxCount=pxCount)
 
     roi.setAngle(45)
     roi.setPos([3, 0])
     rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
     img2.setImage(rgn[0, ..., 0])
     app.processEvents()
-    assertImageApproved(win, name+'/roi_getarrayregion_rotate', 'Simple ROI region selection, rotation.')
+    assertImageApproved(win, name+'/roi_getarrayregion_rotate', 'Simple ROI region selection, rotation.', pxCount=pxCount)
 
     if testResize:
         roi.setSize([60, 60])
         rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
         img2.setImage(rgn[0, ..., 0])
         app.processEvents()
-        assertImageApproved(win, name+'/roi_getarrayregion_resize', 'Simple ROI region selection, resized.')
+        assertImageApproved(win, name+'/roi_getarrayregion_resize', 'Simple ROI region selection, resized.', pxCount=pxCount)
 
     img1.setPos(0, img1.height())
     img1.setTransform(QtGui.QTransform().scale(1, -1).rotate(20), True)
     rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
     img2.setImage(rgn[0, ..., 0])
     app.processEvents()
-    assertImageApproved(win, name+'/roi_getarrayregion_img_trans', 'Simple ROI region selection, image transformed.')
+    assertImageApproved(win, name+'/roi_getarrayregion_img_trans', 'Simple ROI region selection, image transformed.', pxCount=pxCount)
 
     vb1.invertY()
     rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
     img2.setImage(rgn[0, ..., 0])
     app.processEvents()
-    # on windows, one edge of one ROI handle is shifted slightly; letting this slide with pxCount=10
-    if pg.Qt.QT_LIB in {'PyQt4', 'PySide'}:
-        pxCount = 10
-    else:
-        pxCount=-1
     assertImageApproved(win, name+'/roi_getarrayregion_inverty', 'Simple ROI region selection, view inverted.', pxCount=pxCount)
 
     roi.setState(initState)
@@ -146,7 +145,7 @@ def check_getArrayRegion(roi, name, testResize=True, transpose=False):
     rgn = roi.getArrayRegion(data, img1, axes=(1, 2))
     img2.setImage(rgn[0, ..., 0])
     app.processEvents()
-    assertImageApproved(win, name+'/roi_getarrayregion_anisotropic', 'Simple ROI region selection, image scaled anisotropically.')
+    assertImageApproved(win, name+'/roi_getarrayregion_anisotropic', 'Simple ROI region selection, image scaled anisotropically.', pxCount=pxCount)
     
     # allow the roi to be re-used
     roi.scene().removeItem(roi)

tests/image_testing.py

@@ -3,10 +3,7 @@
 """
 Procedure for unit-testing with images:
 
-1. Run unit tests at least once; this initializes a git clone of
+    Run individual test scripts with the PYQTGRAPH_AUDIT environment variable set:
-   pyqtgraph/test-data in ~/.pyqtgraph.
-
-2. Run individual test scripts with the PYQTGRAPH_AUDIT environment variable set:
 
        $ PYQTGRAPH_AUDIT=1 python pyqtgraph/graphicsItems/tests/test_PlotCurveItem.py
 
@@ -17,54 +14,21 @@ Procedure for unit-testing with images:
 
     To check all test results regardless of whether the test failed, set the
     environment variable PYQTGRAPH_AUDIT_ALL=1.
-
-3. After adding or changing test images, create a new commit:
-
-        $ cd ~/.pyqtgraph/test-data
-        $ git add ...
-        $ git commit -a
-
-4. Look up the most recent tag name from the `testDataTag` global variable
-   below. Increment the tag name by 1 and create a new tag in the test-data
-   repository:
-
-        $ git tag test-data-NNN
-        $ git push --tags origin master
-
-    This tag is used to ensure that each pyqtgraph commit is linked to a specific
-    commit in the test-data repository. This makes it possible to push new
-    commits to the test-data repository without interfering with existing
-    tests, and also allows unit tests to continue working on older pyqtgraph
-    versions.
-
 """
 
-
-# This is the name of a tag in the test-data repository that this version of
-# pyqtgraph should be tested against. When adding or changing test images,
-# create and push a new tag and update this variable. To test locally, begin
-# by creating the tag in your ~/.pyqtgraph/test-data repository.
-testDataTag = 'test-data-8'
-
-
 import time
 import os
 import sys
 import inspect
-import base64
+import warnings
-import subprocess as sp
 import numpy as np
 
-if sys.version[0] >= '3':
+from pathlib import Path
-    import http.client as httplib
+
-    import urllib.parse as urllib
+from pyqtgraph.Qt import QtGui, QtCore
-else:
+from pyqtgraph import functions as fn
-    import httplib
+from pyqtgraph import GraphicsLayoutWidget
-    import urllib
+from pyqtgraph import ImageItem, TextItem
-from ..Qt import QtGui, QtCore, QtTest, QT_LIB
-from .. import functions as fn
-from .. import GraphicsLayoutWidget
-from .. import ImageItem, TextItem
 
 
 tester = None
@@ -101,6 +65,21 @@ def getTester():
     return tester
 
 
+def getImageFromWidget(widget):
+
+    # just to be sure the widget size is correct (new window may be resized):
+    QtGui.QApplication.processEvents()
+
+    qimg = QtGui.QImage(widget.size(), QtGui.QImage.Format.Format_ARGB32)
+    qimg.fill(QtCore.Qt.GlobalColor.transparent)
+    painter = QtGui.QPainter(qimg)
+    widget.render(painter)
+    painter.end()
+
+    qimg = qimg.convertToFormat(QtGui.QImage.Format.Format_RGBA8888)
+    return fn.qimage_to_ndarray(qimg).copy()
+
+
 def assertImageApproved(image, standardFile, message=None, **kwargs):
     """Check that an image test result matches a pre-approved standard.
 
@@ -108,10 +87,6 @@ def assertImageApproved(image, standardFile, message=None, **kwargs):
     to compare the images and decide whether to fail the test or save the new
     image as the standard.
 
-    This function will automatically clone the test-data repository into
-    ~/.pyqtgraph/test-data. However, it is up to the user to ensure this repository
-    is kept up to date and to commit/push new images after they are saved.
-
     Run the test with the environment variable PYQTGRAPH_AUDIT=1 to bring up
     the auditing GUI.
 
@@ -131,43 +106,28 @@ def assertImageApproved(image, standardFile, message=None, **kwargs):
     comparison (see ``assertImageMatch()``).
     """
     if isinstance(image, QtGui.QWidget):
-        w = image
-        
         # just to be sure the widget size is correct (new window may be resized):
         QtGui.QApplication.processEvents()
 
-        graphstate = scenegraphState(w, standardFile)
+        graphstate = scenegraphState(image, standardFile)
-        qimg = QtGui.QImage(w.size(), QtGui.QImage.Format.Format_ARGB32)
+        image = getImageFromWidget(image)
-        qimg.fill(QtCore.Qt.GlobalColor.transparent)
-        painter = QtGui.QPainter(qimg)
-        w.render(painter)
-        painter.end()
-        
-        image = fn.imageToArray(qimg, copy=False, transpose=False)
-
-        # the standard images seem to have their Red and Blue swapped
-        if sys.byteorder == 'little':
-            # transpose B,G,R,A to R,G,B,A
-            image = image[..., [2, 1, 0, 3]]
-        else:
-            # transpose A,R,G,B to A,B,G,R
-            image = image[..., [0, 3, 2, 1]]
 
     if message is None:
         code = inspect.currentframe().f_back.f_code
         message = "%s::%s" % (code.co_filename, code.co_name)
 
-    # Make sure we have a test data repo available, possibly invoking git
+    # Make sure we have a test data repo available
-    dataPath = getTestDataRepo()
+    dataPath = getTestDataDirectory()
 
     # Read the standard image if it exists
     stdFileName = os.path.join(dataPath, standardFile + '.png')
     if not os.path.isfile(stdFileName):
         stdImage = None
     else:
-        pxm = QtGui.QPixmap()
+        qimg = QtGui.QImage(stdFileName)
-        pxm.load(stdFileName)
+        qimg = qimg.convertToFormat(QtGui.QImage.Format.Format_RGBA8888)
-        stdImage = fn.imageToArray(pxm.toImage(), copy=True, transpose=False)
+        stdImage = fn.qimage_to_ndarray(qimg).copy()
+        del qimg
 
     # If the test image does not match, then we go to audit if requested.
     try:
@@ -198,11 +158,6 @@ def assertImageApproved(image, standardFile, message=None, **kwargs):
         if os.getenv('PYQTGRAPH_AUDIT_ALL') == '1':
             raise Exception("Image test passed, but auditing due to PYQTGRAPH_AUDIT_ALL evnironment variable.")
     except Exception:
-
-        if stdFileName in gitStatus(dataPath):
-            print("\n\nWARNING: unit test failed against modified standard "
-                  "image %s.\nTo revert this file, run `cd %s; git checkout "
-                  "%s`\n" % (stdFileName, dataPath, standardFile))
         if os.getenv('PYQTGRAPH_AUDIT') == '1' or os.getenv('PYQTGRAPH_AUDIT_ALL') == '1':
             sys.excepthook(*sys.exc_info())
             getTester().test(image, stdImage, message)
@@ -210,16 +165,14 @@ def assertImageApproved(image, standardFile, message=None, **kwargs):
             print('Saving new standard image to "%s"' % stdFileName)
             if not os.path.isdir(stdPath):
                 os.makedirs(stdPath)
-            img = fn.makeQImage(image, alpha=True, transpose=False)
+            qimg = fn.ndarray_to_qimage(image, QtGui.QImage.Format.Format_RGBA8888)
-            img.save(stdFileName)
+            qimg.save(stdFileName)
+            del qimg
         else:
             if stdImage is None:
                 raise Exception("Test standard %s does not exist. Set "
                                 "PYQTGRAPH_AUDIT=1 to add this image." % stdFileName)
-            else:
+            if os.getenv('CI') is not None:
-                if os.getenv('TRAVIS') is not None:
-                    saveFailedTest(image, stdImage, standardFile, upload=True)
-                elif os.getenv('CI') is not None:
                 standardFile = os.path.join(os.getenv("SCREENSHOT_DIR", "screenshots"), standardFile)
                 saveFailedTest(image, stdImage, standardFile)
             print(graphstate)
@@ -249,8 +202,8 @@ def assertImageMatch(im1, im2, minCorr=None, pxThreshold=50.,
     pxThreshold : float
         Minimum value difference at which two pixels are considered different
     pxCount : int or None
-        Maximum number of pixels that may differ. Default is 0 for Qt4 and 
+        Maximum number of pixels that may differ. Default is 0, on Windows some
-        1% of image size for Qt5.
+        tests have a value of 2.
     maxPxDiff : float or None
         Maximum allowed difference between pixels
     avgPxDiff : float or None
@@ -264,11 +217,6 @@ def assertImageMatch(im1, im2, minCorr=None, pxThreshold=50.,
     assert im1.dtype == im2.dtype
 
     if pxCount == -1:
-        if QT_LIB in {'PyQt5', 'PySide2', 'PySide6', 'PyQt6'}:
-            # Qt5 generates slightly different results; relax the tolerance
-            # until test images are updated.
-            pxCount = int(im1.shape[0] * im1.shape[1] * 0.01)
-        else:
         pxCount = 0
     
     diff = im1.astype(float) - im2.astype(float)
@@ -292,9 +240,7 @@ def assertImageMatch(im1, im2, minCorr=None, pxThreshold=50.,
         assert corr >= minCorr
 
 
-def saveFailedTest(data, expect, filename, upload=False):
+def saveFailedTest(data, expect, filename):
-    """Upload failed test images to web server to allow CI test debugging.
-    """
     # concatenate data, expect, and diff into a single image
     ds = data.shape
     es = expect.shape
@@ -310,7 +256,7 @@ def saveFailedTest(data, expect, filename, upload=False):
     diff = makeDiffImage(data, expect)
     img[2:2+diff.shape[0], -diff.shape[1]-2:-2] = diff
 
-    png = makePng(img)
+    png = makePng(data)  # change `img` to `data` to save just the failed image
     directory = os.path.dirname(filename)
     if not os.path.isdir(directory):
         os.makedirs(directory)
@@ -318,38 +264,15 @@ def saveFailedTest(data, expect, filename, upload=False):
         png_file.write(png)
     print("\nImage comparison failed. Test result: %s %s   Expected result: "
         "%s %s" % (data.shape, data.dtype, expect.shape, expect.dtype))
-    if upload:
-        uploadFailedTest(filename, png)
-
-
-def uploadFailedTest(filename, png):
-    commit = runSubprocess(['git', 'rev-parse',  'HEAD'])
-    name = filename.split(os.path.sep)
-    name.insert(-1, commit.strip())
-    filename = os.path.sep.join(name)
-
-    host = 'data.pyqtgraph.org'
-    conn = httplib.HTTPConnection(host)
-    req = urllib.urlencode({'name': filename,
-                            'data': base64.b64encode(png)})
-    conn.request('POST', '/upload.py', req)
-    response = conn.getresponse().read()
-    conn.close()
-
-    print("Uploaded to: \nhttp://%s/data/%s" % (host, filename))
-    if not response.startswith(b'OK'):
-        print("WARNING: Error uploading data to %s" % host)
-        print(response)
 
 
 def makePng(img):
     """Given an array like (H, W, 4), return a PNG-encoded byte string.
     """
     io = QtCore.QBuffer()
-    qim = fn.makeQImage(img.transpose(1, 0, 2), alpha=False)
+    qim = fn.ndarray_to_qimage(img, QtGui.QImage.Format.Format_RGBX8888)
     qim.save(io, 'PNG')
-    png = bytes(io.data().data())
+    return bytes(io.data().data())
-    return png
 
 
 def makeDiffImage(im1, im2):
@@ -467,155 +390,18 @@ class ImageTester(QtGui.QWidget):
 
 
 def getTestDataRepo():
-    """Return the path to a git repository with the required commit checked
+    warnings.warn(
-    out.
+        "Test data data repo has been merged with the main repo"
-
+        "use getTestDataDirectory() instead, this method will be removed"
-    If the repository does not exist, then it is cloned from
+        "in a future version of pyqtgraph",
-    https://github.com/pyqtgraph/test-data. If the repository already exists
+        DeprecationWarning, stacklevel=2
-    then the required commit is checked out.
+    )
-    """
+    return getTestDataDirectory()
-    global testDataTag
-
-    if os.getenv("CI"):
-        dataPath = os.path.join(os.environ["GITHUB_WORKSPACE"], '.pyqtgraph', 'test-data')
-    else:
-        dataPath = os.path.join(os.path.expanduser('~'), '.pyqtgraph', 'test-data')
-    gitPath = 'https://github.com/pyqtgraph/test-data'
-    gitbase = gitCmdBase(dataPath)
-
-    if os.path.isdir(dataPath):
-        # Already have a test-data repository to work with.
-
-        # Get the commit ID of testDataTag. Do a fetch if necessary.
-        try:
-            tagCommit = gitCommitId(dataPath, testDataTag)
-        except NameError:
-            cmd = gitbase + ['fetch', '--tags', 'origin']
-            print(' '.join(cmd))
-            sp.check_call(cmd)
-            try:
-                tagCommit = gitCommitId(dataPath, testDataTag)
-            except NameError:
-                raise Exception("Could not find tag '%s' in test-data repo at"
-                                " %s" % (testDataTag, dataPath))
-        except Exception:
-            if not os.path.exists(os.path.join(dataPath, '.git')):
-                raise Exception("Directory '%s' does not appear to be a git "
-                                "repository. Please remove this directory." %
-                                dataPath)
-            else:
-                raise
-
-        # If HEAD is not the correct commit, then do a checkout
-        if gitCommitId(dataPath, 'HEAD') != tagCommit:
-            print("Checking out test-data tag '%s'" % testDataTag)
-            sp.check_call(gitbase + ['checkout', testDataTag])
-
-    else:
-        print("Attempting to create git clone of test data repo in %s.." %
-              dataPath)
-
-        parentPath = os.path.split(dataPath)[0]
-        if not os.path.isdir(parentPath):
-            os.makedirs(parentPath)
-
-        if os.getenv('TRAVIS') is not None or os.getenv('CI') is not None:
-            # Create a shallow clone of the test-data repository (to avoid
-            # downloading more data than is necessary)
-            os.makedirs(dataPath)
-            cmds = [
-                gitbase + ['init'],
-                gitbase + ['remote', 'add', 'origin', gitPath],
-                gitbase + ['fetch', '--tags', 'origin', testDataTag,
-                           '--depth=1'],
-                gitbase + ['checkout', '-b', 'master', 'FETCH_HEAD'],
-            ]
-        else:
-            # Create a full clone
-            cmds = [['git', 'clone', gitPath, dataPath]]
-
-        for cmd in cmds:
-            print(' '.join(cmd))
-            rval = sp.check_call(cmd)
-            if rval == 0:
-                continue
-            raise RuntimeError("Test data path '%s' does not exist and could "
-                               "not be created with git. Please create a git "
-                               "clone of %s at this path." %
-                               (dataPath, gitPath))
-
-    return dataPath
 
 
-def gitCmdBase(path):
+def getTestDataDirectory():
-    return ['git', '--git-dir=%s/.git' % path, '--work-tree=%s' % path]
+    dataPath = Path(__file__).absolute().parent / "images"
-
+    return dataPath.as_posix()
-
-def gitStatus(path):
-    """Return a string listing all changes to the working tree in a git
-    repository.
-    """
-    cmd = gitCmdBase(path) + ['status', '--porcelain']
-    return runSubprocess(cmd, stderr=None, universal_newlines=True)
-
-
-def gitCommitId(path, ref):
-    """Return the commit id of *ref* in the git repository at *path*.
-    """
-    cmd = gitCmdBase(path) + ['show', ref]
-    try:
-        output = runSubprocess(cmd, stderr=None, universal_newlines=True)
-    except sp.CalledProcessError:
-        print(cmd)
-        raise NameError("Unknown git reference '%s'" % ref)
-    commit = output.split('\n')[0]
-    assert commit[:7] == 'commit '
-    return commit[7:]
-
-
-def runSubprocess(command, return_code=False, **kwargs):
-    """Run command using subprocess.Popen
-    
-    Similar to subprocess.check_output(), which is not available in 2.6.
-
-    Run command and wait for command to complete. If the return code was zero
-    then return, otherwise raise CalledProcessError.
-    By default, this will also add stdout= and stderr=subproces.PIPE
-    to the call to Popen to suppress printing to the terminal.
-
-    Parameters
-    ----------
-    command : list of str
-        Command to run as subprocess (see subprocess.Popen documentation).
-    **kwargs : dict
-        Additional kwargs to pass to ``subprocess.Popen``.
-
-    Returns
-    -------
-    stdout : str
-        Stdout returned by the process.
-    """
-    # code adapted with permission from mne-python
-    use_kwargs = dict(stderr=None, stdout=sp.PIPE)
-    use_kwargs.update(kwargs)
-
-    p = sp.Popen(command, **use_kwargs)
-    output = p.communicate()[0]
-
-    # communicate() may return bytes, str, or None depending on the kwargs
-    # passed to Popen(). Convert all to unicode str:
-    output = '' if output is None else output
-    output = output.decode('utf-8') if isinstance(output, bytes) else output
-
-    if p.returncode != 0:
-        print(output)
-        err_fun = sp.CalledProcessError.__init__
-        if 'output' in inspect.getfullargspec(err_fun).args:
-            raise sp.CalledProcessError(p.returncode, command, output)
-        else:
-            raise sp.CalledProcessError(p.returncode, command)
-    
-    return output
 
 
 def scenegraphState(view, name):
@@ -632,7 +418,7 @@ def scenegraphState(view, name):
     
 def itemState(root):
     state = str(root) + '\n'
-    from .. import ViewBox
+    from pyqtgraph import ViewBox
     state += 'bounding rect: ' + str(root.boundingRect()) + '\n'
     if isinstance(root, ViewBox):
         state += "view range: " + str(root.viewRange()) + '\n'
@@ -647,7 +433,7 @@ def transformStr(t):
 
 
 def indent(s, pfx):
-    return '\n'.join([pfx+line for line in s.split('\n')])
+    return '\n'.join(pfx+line for line in s.split('\n'))
 
 
 class TransposedImageItem(ImageItem):