[AIRFLOW-3742] Fix handling of "fallback" for AirflowConfigParsxer.ge…

…tint/boolean (#4674)

We added (and used) fallback as an argument on `getboolean` but didn't
add it to the method, or add tests covering those "casting" accessors,
so they broke.

This fixes those methods, and adds tests covering them

airflow/configuration.py

@@ -260,27 +260,27 @@ def get(self, section, key, **kwargs):
                 "section/key [{section}/{key}] not found "
                 "in config".format(**locals()))
 
-    def getboolean(self, section, key):
-        val = str(self.get(section, key)).lower().strip()
+    def getboolean(self, section, key, **kwargs):
+        val = str(self.get(section, key, **kwargs)).lower().strip()
         if '#' in val:
             val = val.split('#')[0].strip()
-        if val.lower() in ('t', 'true', '1'):
+        if val in ('t', 'true', '1'):
             return True
-        elif val.lower() in ('f', 'false', '0'):
+        elif val in ('f', 'false', '0'):
             return False
         else:
             raise AirflowConfigException(
                 'The value for configuration option "{}:{}" is not a '
                 'boolean (received "{}").'.format(section, key, val))
 
-    def getint(self, section, key):
-        return int(self.get(section, key))
+    def getint(self, section, key, **kwargs):
+        return int(self.get(section, key, **kwargs))
 
-    def getfloat(self, section, key):
-        return float(self.get(section, key))
+    def getfloat(self, section, key, **kwargs):
+        return float(self.get(section, key, **kwargs))
 
-    def read(self, filenames):
-        super(AirflowConfigParser, self).read(filenames)
+    def read(self, filenames, **kwargs):
+        super(AirflowConfigParser, self).read(filenames, **kwargs)
         self._validate()
 
     def read_dict(self, *args, **kwargs):

tests/test_configuration.py

@@ -139,7 +139,7 @@ def test_conf_as_dict_raw(self):
         self.assertEqual(cfg_dict['testsection']['testpercent'], 'with%%percent')
         self.assertEqual(cfg_dict['core']['percent'], 'with%%inside')
 
-    def test_command_config(self):
+    def test_command_precedence(self):
         TEST_CONFIG = '''[test]
 key1 = hello
 key2_cmd = printf cmd_result
@@ -170,6 +170,9 @@ def test_command_config(self):
         self.assertEqual('hello', test_conf.get('test', 'key1', fallback='fb'))
         self.assertEqual('value6', test_conf.get('another', 'key6', fallback='fb'))
         self.assertEqual('fb', test_conf.get('another', 'key7', fallback='fb'))
+        self.assertEqual(True, test_conf.getboolean('another', 'key8_boolean', fallback='True'))
+        self.assertEqual(10, test_conf.getint('another', 'key8_int', fallback='10'))
+        self.assertEqual(1.0, test_conf.getfloat('another', 'key8_float', fallback='1'))
 
         self.assertTrue(test_conf.has_option('test', 'key1'))
         self.assertTrue(test_conf.has_option('test', 'key2'))