Stop the test from failing when EXIV2_ENABLE_BMFF=Off.

tests/bugfixes/github/test_issue_1570.py

@@ -1,20 +1,33 @@
 # -*- coding: utf-8 -*-
 
-from system_tests import CaseMeta, path
+import system_tests
+import unittest
 
+# test needs system_tests.BT.vv['enable_bmff']=1
+bSkip=system_tests.BT.verbose_version().get('enable_bmff')!='1'
+if bSkip:
+    raise unittest.SkipTest('*** requires enable_bmff=1 ***')
 
-class BmffImageReadMetadataOutOfBoundsRead(metaclass=CaseMeta):
+class BmffImageReadMetadataOutOfBoundsRead(metaclass=system_tests.CaseMeta):
     """
     Regression test for the bug described in:
     https://github.com/Exiv2/exiv2/issues/1570
     """
     url = "https://github.com/Exiv2/exiv2/issues/1570"
+    filename = "$data_path/issue_1570_poc.bmff"
 
-    filename = path("$data_path/issue_1570_poc.bmff")
-    commands = ["$exiv2 $filename"]
-    stdout = [""]
-    stderr = [
-"""Exiv2 exception in print action for file $filename:
+    if bSkip:
+        commands=[]
+        retval=[]
+        stdin=[]
+        stderr=[]
+        stdout=[]
+        print("*** test skipped.  requires enable_bmff=1***")
+    else:
+        commands = ["$exiv2 $filename"]
+        stdout = [""]
+        stderr = [
+            """Exiv2 exception in print action for file $filename:
 $kerCorruptedMetadata
 """]
-    retval = [1]
+        retval = [1]