CAM: Fix and enable TestPathHelix again

Since the fixture in use has holes smaller than the default tool dimeter,
executing a helix operation with default parameters (i.e. all holes)
used to fail with an exception. Some tests work around this by actively
chaning the tool diameter, and this fix is now moved into the global
setup where the respective fixture is loaded.

The reason why the tests got disabled in the first place is unclear.

src/Mod/CAM/CAMTests/TestPathHelix.py

@@ -43,6 +43,9 @@ class TestPathHelix(PathTestUtils.PathTestBase):
         self.doc = FreeCAD.open(FreeCAD.getHomePath() + "Mod/CAM/CAMTests/test_holes00.fcstd")
         self.job = PathJob.Create("Job", [self.doc.Body])
 
+        # the smallest hole in the fixture is 1mm in diameter, so our tool must be smaller.
+        self.job.Tools.Group[0].Tool.Diameter = 0.9
+
     def tearDown(self):
         FreeCAD.closeDocument(self.doc.Name)
 
@@ -66,8 +69,6 @@ class TestPathHelix(PathTestUtils.PathTestBase):
     def test02(self):
         """Verify Helix generates proper holes for rotated model"""
 
-        self.job.Tools.Group[0].Tool.Diameter = 0.5
-
         op = PathHelix.Create("Helix")
         proxy = op.Proxy
         model = self.job.Model.Group[0]

src/Mod/CAM/TestCAMApp.py

@@ -37,9 +37,8 @@ from CAMTests.TestPathGeneratorDogboneII import TestGeneratorDogboneII
 from CAMTests.TestPathGeom import TestPathGeom
 from CAMTests.TestPathLanguage import TestPathLanguage
 from CAMTests.TestPathOpDeburr import TestPathOpDeburr
-
-# from CAMTests.TestPathHelix import TestPathHelix
 from CAMTests.TestPathHelpers import TestPathHelpers
+from CAMTests.TestPathHelix import TestPathHelix
 from CAMTests.TestPathHelixGenerator import TestPathHelixGenerator
 from CAMTests.TestPathLog import TestPathLog
 from CAMTests.TestPathOpUtil import TestPathOpUtil
@@ -98,7 +97,7 @@ False if TestPathOpDeburr.__name__ else True
 False if TestPathDrillable.__name__ else True
 False if TestPathGeom.__name__ else True
 False if TestPathHelpers.__name__ else True
-# False if TestPathHelix.__name__ else True
+False if TestPathHelix.__name__ else True
 False if TestPathLog.__name__ else True
 False if TestPathOpUtil.__name__ else True
 # False if TestPathPost.__name__ else True