bug 1382622, fix tests to use .val instead of .get_val(), r=stas

The get_val wasn't really intended to be an API to begin with.
Using the property .val is forwards and backwards compatible.

Author: Pike

tests/migrate/test_concat.py

@@ -20,7 +20,7 @@
 
 class MockContext(unittest.TestCase):
     def get_source(self, path, key):
-        return self.strings.get(key, None).get_val()
+        return self.strings.get(key, None).val
 
 
 @unittest.skipUnless(PropertiesParser, 'compare-locales required')

tests/migrate/test_literal.py

@@ -15,7 +15,7 @@
 
 class MockContext(unittest.TestCase):
     def get_source(self, path, key):
-        return self.strings.get(key, None).get_val()
+        return self.strings.get(key, None).val
 
 
 @unittest.skipUnless(PropertiesParser, 'compare-locales required')

tests/migrate/test_merge.py

@@ -18,7 +18,7 @@
 
 class MockContext(unittest.TestCase):
     def get_source(self, path, key):
-        return self.ab_cd_legacy.get(key, None).get_val()
+        return self.ab_cd_legacy.get(key, None).val
 
 
 @unittest.skipUnless(PropertiesParser and DTDParser,

tests/migrate/test_plural.py

@@ -19,7 +19,7 @@ class MockContext(unittest.TestCase):
     plural_categories = ('one', 'other')
 
     def get_source(self, path, key):
-        return self.strings.get(key, None).get_val()
+        return self.strings.get(key, None).val
 
 
 @unittest.skipUnless(PropertiesParser, 'compare-locales required')

tests/migrate/test_replace.py

@@ -16,7 +16,7 @@
 
 class MockContext(unittest.TestCase):
     def get_source(self, path, key):
-        return self.strings.get(key, None).get_val()
+        return self.strings.get(key, None).val
 
 
 @unittest.skipUnless(PropertiesParser, 'compare-locales required')