Split test_python_types.cpp into builtin_casters, stl and pytypes

tests/test_pytypes.py

@@ -0,0 +1,211 @@
+import pytest
+import sys
+
+from pybind11_tests import pytypes as m
+from pybind11_tests import debug_enabled
+
+
+def test_list(capture, doc):
+    with capture:
+        l = m.get_list()
+        assert l == ["overwritten"]
+
+        l.append("value2")
+        m.print_list(l)
+    assert capture.unordered == """
+        Entry at position 0: value
+        list item 0: overwritten
+        list item 1: value2
+    """
+
+    assert doc(m.get_list) == "get_list() -> list"
+    assert doc(m.print_list) == "print_list(arg0: list) -> None"
+
+
+def test_set(capture, doc):
+    s = m.get_set()
+    assert s == {"key1", "key2", "key3"}
+
+    with capture:
+        s.add("key4")
+        m.print_set(s)
+    assert capture.unordered == """
+        key: key1
+        key: key2
+        key: key3
+        key: key4
+    """
+
+    assert doc(m.get_list) == "get_list() -> list"
+    assert doc(m.print_list) == "print_list(arg0: list) -> None"
+
+
+def test_dict(capture, doc):
+    d = m.get_dict()
+    assert d == {"key": "value"}
+
+    with capture:
+        d["key2"] = "value2"
+        m.print_dict(d)
+    assert capture.unordered == """
+        key: key, value=value
+        key: key2, value=value2
+    """
+
+    assert doc(m.get_dict) == "get_dict() -> dict"
+    assert doc(m.print_dict) == "print_dict(arg0: dict) -> None"
+
+    assert m.dict_keyword_constructor() == {"x": 1, "y": 2, "z": 3}
+
+
+def test_str(doc):
+    assert m.str_from_string().encode().decode() == "baz"
+    assert m.str_from_bytes().encode().decode() == "boo"
+
+    assert doc(m.str_from_bytes) == "str_from_bytes() -> str"
+
+    class A(object):
+        def __str__(self):
+            return "this is a str"
+
+        def __repr__(self):
+            return "this is a repr"
+
+    assert m.str_from_object(A()) == "this is a str"
+    assert m.repr_from_object(A()) == "this is a repr"
+
+    s1, s2 = m.str_format()
+    assert s1 == "1 + 2 = 3"
+    assert s1 == s2
+
+
+def test_bytes(doc):
+    assert m.bytes_from_string().decode() == "foo"
+    assert m.bytes_from_str().decode() == "bar"
+
+    assert doc(m.bytes_from_str) == "bytes_from_str() -> {}".format(
+        "bytes" if sys.version_info[0] == 3 else "str"
+    )
+
+
+def test_capsule(capture):
+    pytest.gc_collect()
+    with capture:
+        a = m.return_capsule_with_destructor()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        creating capsule
+        destructing capsule
+    """
+
+    with capture:
+        a = m.return_capsule_with_destructor_2()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        creating capsule
+        destructing capsule: 1234
+    """
+
+    with capture:
+        a = m.return_capsule_with_name_and_destructor()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        created capsule (1234, 'pointer type description')
+        destructing capsule (1234, 'pointer type description')
+    """
+
+
+def test_accessors():
+    class SubTestObject:
+        attr_obj = 1
+        attr_char = 2
+
+    class TestObject:
+        basic_attr = 1
+        begin_end = [1, 2, 3]
+        d = {"operator[object]": 1, "operator[char *]": 2}
+        sub = SubTestObject()
+
+        def func(self, x, *args):
+            return self.basic_attr + x + sum(args)
+
+    d = m.accessor_api(TestObject())
+    assert d["basic_attr"] == 1
+    assert d["begin_end"] == [1, 2, 3]
+    assert d["operator[object]"] == 1
+    assert d["operator[char *]"] == 2
+    assert d["attr(object)"] == 1
+    assert d["attr(char *)"] == 2
+    assert d["missing_attr_ptr"] == "raised"
+    assert d["missing_attr_chain"] == "raised"
+    assert d["is_none"] is False
+    assert d["operator()"] == 2
+    assert d["operator*"] == 7
+
+    assert m.tuple_accessor(tuple()) == (0, 1, 2)
+
+    d = m.accessor_assignment()
+    assert d["get"] == 0
+    assert d["deferred_get"] == 0
+    assert d["set"] == 1
+    assert d["deferred_set"] == 1
+    assert d["var"] == 99
+
+
+def test_constructors():
+    """C++ default and converting constructors are equivalent to type calls in Python"""
+    types = [str, bool, int, float, tuple, list, dict, set]
+    expected = {t.__name__: t() for t in types}
+    assert m.default_constructors() == expected
+
+    data = {
+        str: 42,
+        bool: "Not empty",
+        int: "42",
+        float: "+1e3",
+        tuple: range(3),
+        list: range(3),
+        dict: [("two", 2), ("one", 1), ("three", 3)],
+        set: [4, 4, 5, 6, 6, 6],
+        memoryview: b'abc'
+    }
+    inputs = {k.__name__: v for k, v in data.items()}
+    expected = {k.__name__: k(v) for k, v in data.items()}
+    assert m.converting_constructors(inputs) == expected
+    assert m.cast_functions(inputs) == expected
+
+
+def test_implicit_casting():
+    """Tests implicit casting when assigning or appending to dicts and lists."""
+    z = m.get_implicit_casting()
+    assert z['d'] == {
+        'char*_i1': 'abc', 'char*_i2': 'abc', 'char*_e': 'abc', 'char*_p': 'abc',
+        'str_i1': 'str', 'str_i2': 'str1', 'str_e': 'str2', 'str_p': 'str3',
+        'int_i1': 42, 'int_i2': 42, 'int_e': 43, 'int_p': 44
+    }
+    assert z['l'] == [3, 6, 9, 12, 15]
+
+
+def test_print(capture):
+    with capture:
+        m.print_function()
+    assert capture == """
+        Hello, World!
+        1 2.0 three True -- multiple args
+        *args-and-a-custom-separator
+        no new line here -- next print
+        flush
+        py::print + str.format = this
+    """
+    assert capture.stderr == "this goes to stderr"
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.print_failure()
+    assert str(excinfo.value) == "make_tuple(): unable to convert " + (
+        "argument of type 'UnregisteredType' to Python object"
+        if debug_enabled else
+        "arguments to Python object (compile in debug mode for details)"
+    )