AppveyorCI: Prevent skip of tests of XMLBear

XMLBear is skipped on Appveyor Windows builds
due to dependency issues. Fixes all dependency
issues.

Closes coala#1354

.ci/appveyor.yml

@@ -29,7 +29,7 @@ install:
   # done from inside the powershell script as it would require to restart
   # the parent CMD process).
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - "SET PATH=C:\\Program\ Files\\Java\\jdk1.7.0\\bin;%PATH%"
+  - "SET PATH=C:\\tools\\xmllint\\bin;C:\\Program\ Files\\Java\\jdk1.7.0\\bin;%PATH%"
 
   # language-tool needs the registry tweaked here since it determines the java
   # version wrong (since appveyor has both, 1.7 and 1.8 in x86 and x64).
@@ -48,6 +48,16 @@ install:
   - "npm config set loglevel warn"
   - "npm install"
 
+  - curl -fsSL ftp://ftp.zlatkovic.com/libxml/iconv-1.9.2.win32.zip -o iconv.zip
+  - curl -fsSL ftp://ftp.zlatkovic.com/libxml/libxml2-2.7.8.win32.zip -o libxml2.zip
+  - curl -fsSL ftp://ftp.zlatkovic.com/libxml/libxslt-1.1.26.win32.zip -o libxslt.zip
+  - curl -fsSL ftp://ftp.zlatkovic.com/libxml/zlib-1.2.5.win32.zip -o zlib.zip
+  - 7z x *.zip -oC:\tools\xmllint
+  - xcopy C:\tools\xmllint\iconv-1.9.2.win32 C:\tools\xmllint /E /H /R /X /Y /I /K
+  - xcopy C:\tools\xmllint\libxml2-2.7.8.win32 C:\tools\xmllint /E /H /R /X /Y /I /K
+  - xcopy C:\tools\xmllint\libxslt-1.1.26.win32 C:\tools\xmllint /E /H /R /X /Y /I /K
+  - xcopy C:\tools\xmllint\zlib-1.2.5 C:\tools\xmllint /E /H /R /X /Y /I /K
+
 build: false  # Not a C# project, build stuff at the test step instead.
 
 test_script:

tests/xml2/XMLBearTest.py

@@ -36,13 +36,13 @@ def load_testdata(filename):
 <a>hey and hi</a>
 """
 
-dtd_file = os.path.join(os.path.dirname(__file__),
-                        'test_files',
-                        'note.dtd')
+dtd_file = os.path.abspath(os.path.join(
+    os.path.dirname(os.path.realpath(__file__)),
+    'testfiles', 'note.dtd'))
 
-schema_file = os.path.join(os.path.dirname(__file__),
-                           'test_files',
-                           'note.xsd')
+schema_file = os.path.abspath(os.path.join(
+    os.path.dirname(os.path.realpath(__file__)),
+    'testfiles', 'note.xsd'))
 
 valid_xml_path = load_testdata('note.xml')
 valid_xml_url = load_testdata('concept-valid.xml')