[testsuite] Addapt tests to new test suite structure

tests/bugfixes/github/test_issue_45.py

@@ -3,12 +3,12 @@
 import system_tests
 
 
-class Sigma24_105mmRecognization(system_tests.Case):
+class Sigma24_105mmRecognization(metaclass=system_tests.CaseMeta):
 
     url = "https://github.com/Exiv2/exiv2/issues/45"
 
-    filename = "{data_path}/exiv2-g45.exv"
-    commands = ["{exiv2} -pa --grep lens/i " + filename]
+    filename = "$data_path/exiv2-g45.exv"
+    commands = ["$exiv2 -pa --grep lens/i " + filename]
     stdout = ["""Exif.CanonCs.LensType                        Short       1  Sigma 24-105mm F4 DG OS HSM [Art 013]
 Exif.CanonCs.Lens                            Short       3  24.0 - 105.0 mm
 Exif.CanonCf.LensAFStopButton                Short       1  0