Add a simple test for scanner

tests/scanner.TestCase

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+import unittest
+import optparse
+from pathlib import Path
+from os.path import basename, dirname, realpath
+
+from fdroidserver import scanner
+from fdroidserver.metadata import Build
+import fdroidserver.common
+
+
+class ScannerTest(unittest.TestCase):
+    def test_scan_source_files(self):
+        source_files = Path(dirname(realpath(__file__)), 'source-files')
+        projects = {
+            'Zillode': 1,
+            'firebase-suspect': 1
+        }
+        for d in source_files.iterdir():
+            fatal_problems = scanner.scan_source(d, Build())
+            self.assertEqual(projects.get(basename(d), 0), fatal_problems)
+
+
+if __name__ == "__main__":
+    parser = optparse.OptionParser()
+    parser.add_option("-v", "--verbose", action="store_true", default=False,
+                      help="Spew out even more information than normal")
+    (fdroidserver.common.options, args) = parser.parse_args(['--verbose'])
+
+    newSuite = unittest.TestSuite()
+    newSuite.addTest(unittest.makeSuite(ScannerTest))
+    unittest.main(failfast=False)