tests: add tests for BitMask*.is_all_on()

tests/putil/test_bitmask.py

@@ -0,0 +1,10 @@
+from panda3d import core
+
+
+def test_bitmask_allon():
+    assert core.BitMask16.all_on().is_all_on()
+    assert core.BitMask32.all_on().is_all_on()
+    assert core.BitMask64.all_on().is_all_on()
+    assert core.DoubleBitMaskNative.all_on().is_all_on()
+    assert core.QuadBitMaskNative.all_on().is_all_on()
+    assert core.BitArray.all_on().is_all_on()