read_array/map_header functionality

test/test_read_size.py

@@ -0,0 +1,66 @@
+"""Test Unpacker's read_array_header and read_map_header methods"""
+from msgpack import packb, Unpacker
+UnexpectedTypeException = ValueError
+
+def test_read_array_header():
+    unpacker = Unpacker()
+    unpacker.feed(packb(['a', 'b', 'c']))
+    assert unpacker.read_array_header() == 3
+    assert unpacker.unpack() == 'a'
+    assert unpacker.unpack() == 'b'
+    assert unpacker.unpack() == 'c'
+    try:
+        unpacker.unpack()
+        assert 0, 'should raise exception'
+    except StopIteration:
+        assert 1, 'okay'
+
+
+def test_read_map_header():
+    unpacker = Unpacker()
+    unpacker.feed(packb({'a': 'A'}))
+    assert unpacker.read_map_header() == 1
+    assert unpacker.unpack() == 'a'
+    assert unpacker.unpack() == 'A'
+    try:
+        unpacker.unpack()
+        assert 0, 'should raise exception'
+    except StopIteration:
+        assert 1, 'okay'
+
+def test_incorrect_type_array():
+    unpacker = Unpacker()
+    unpacker.feed(packb(1))
+    try:
+        unpacker.read_array_header()
+        assert 0, 'should raise exception'
+    except UnexpectedTypeException:
+        assert 1, 'okay'
+
+def test_incorrect_type_map():
+    unpacker = Unpacker()
+    unpacker.feed(packb(1))
+    try:
+        unpacker.read_map_header()
+        assert 0, 'should raise exception'
+    except UnexpectedTypeException:
+        assert 1, 'okay'
+
+def test_correct_type_nested_array():
+    unpacker = Unpacker()
+    unpacker.feed(packb({'a': ['b', 'c', 'd']}))
+    try:
+        unpacker.read_array_header()
+        assert 0, 'should raise exception'
+    except UnexpectedTypeException:
+        assert 1, 'okay'
+
+def test_incorrect_type_nested_map():
+    unpacker = Unpacker()
+    unpacker.feed(packb([{'a': 'b'}]))
+    try:
+        unpacker.read_map_header()
+        assert 0, 'should raise exception'
+    except UnexpectedTypeException:
+        assert 1, 'okay'
+