Added validation test for all qualities shipped with Cura

This checks if the qualities are atleast formatted righ.

tests/Settings/TestQualities.py

@@ -0,0 +1,35 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import pytest
+
+from UM.Settings.InstanceContainer import InstanceContainer
+
+import os
+import os.path
+
+
+def collectAllQualities():
+    result = []
+    for root, directories, filenames in os.walk(os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "resources", "quality"))):
+        for filename in filenames:
+            result.append(os.path.join(root, filename))
+    return result
+
+
+quality_filepaths = collectAllQualities()
+
+##  Atempt to load all the quality types
+@pytest.mark.parametrize("file_name", quality_filepaths)
+def test_validateQualityProfiles(file_name):
+    try:
+        with open(file_name, encoding="utf-8") as data:
+            json = data.read()
+            InstanceContainer._readAndValidateSerialized(json)
+            # Fairly obvious, but all the types here should be of the type quality
+            assert InstanceContainer.getConfigurationTypeFromSerialized(json) == "quality"
+
+    except Exception as e:
+        # File can't be read, header sections missing, whatever the case, this shouldn't happen!
+        print("Go an Exception while reading he file [%s]: %s" % (file_name, e))
+        assert False