add DefaultPartitioner test

test/test_partitioner.py

@@ -1,23 +1,43 @@
+import pytest
 import six
-from . import unittest
 
-from kafka.partitioner import (Murmur2Partitioner)
+from kafka.partitioner import Murmur2Partitioner
+from kafka.partitioner.default import DefaultPartitioner
 
-class TestMurmurPartitioner(unittest.TestCase):
-    def test_hash_bytes(self):
-        p = Murmur2Partitioner(range(1000))
-        self.assertEqual(p.partition(bytearray(b'test')), p.partition(b'test'))
 
-    def test_hash_encoding(self):
-        p = Murmur2Partitioner(range(1000))
-        self.assertEqual(p.partition('test'), p.partition(u'test'))
+def test_default_partitioner():
+    partitioner = DefaultPartitioner()
+    all_partitions = list(range(100))
+    available = all_partitions
+    # partitioner should return the same partition for the same key
+    p1 = partitioner(b'foo', all_partitions, available)
+    p2 = partitioner(b'foo', all_partitions, available)
+    assert p1 == p2
+    assert p1 in all_partitions
 
-    def test_murmur2_java_compatibility(self):
-        p = Murmur2Partitioner(range(1000))
-        # compare with output from Kafka's org.apache.kafka.clients.producer.Partitioner
-        self.assertEqual(681, p.partition(b''))
-        self.assertEqual(524, p.partition(b'a'))
-        self.assertEqual(434, p.partition(b'ab'))
-        self.assertEqual(107, p.partition(b'abc'))
-        self.assertEqual(566, p.partition(b'123456789'))
-        self.assertEqual(742, p.partition(b'\x00 '))
+    # when key is None, choose one of available partitions
+    assert partitioner(None, all_partitions, [123]) == 123
+
+    # with fallback to all_partitions
+    assert partitioner(None, all_partitions, []) in all_partitions
+
+
+def test_hash_bytes():
+    p = Murmur2Partitioner(range(1000))
+    assert p.partition(bytearray(b'test')) == p.partition(b'test')
+    
+
+def test_hash_encoding():
+    p = Murmur2Partitioner(range(1000))
+    assert p.partition('test') == p.partition(u'test')
+
+
+def test_murmur2_java_compatibility():
+    p = Murmur2Partitioner(range(1000))
+    # compare with output from Kafka's org.apache.kafka.clients.producer.Partitioner
+    assert p.partition(b'') == 681
+    assert p.partition(b'a') == 524
+    assert p.partition(b'ab') == 434
+    assert p.partition(b'abc') == 107
+    assert p.partition(b'123456789') == 566
+    assert p.partition(b'\x00 ') == 742