/
test_core.py
206 lines (145 loc) · 3.44 KB
/
test_core.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
from multipledispatch import dispatch as orig_dispatch
from multipledispatch.utils import raises
from functools import partial
import pytest
@pytest.fixture(name="dispatch")
def fixture_dispatch():
return partial(orig_dispatch, namespace=dict())
def test_singledispatch(dispatch):
@dispatch(int)
def f(x):
return x + 1
@dispatch(int)
def g(x):
return x + 2
@dispatch(float)
def f(x):
return x - 1
assert f(1) == 2
assert g(1) == 3
assert f(1.0) == 0
assert raises(NotImplementedError, lambda: f('hello'))
def test_multipledispatch(dispatch):
@dispatch(int, int)
def f(x, y):
return x + y
@dispatch(float, float)
def f(x, y):
return x - y
assert f(1, 2) == 3
assert f(1.0, 2.0) == -1.0
class A(object): pass
class B(object): pass
class C(A): pass
class D(C): pass
class E(C): pass
def test_inheritance(dispatch):
@dispatch(A)
def f(x):
return 'a'
@dispatch(B)
def f(x):
return 'b'
assert f(A()) == 'a'
assert f(B()) == 'b'
assert f(C()) == 'a'
def test_inheritance_and_multiple_dispatch(dispatch):
@dispatch(A, A)
def f(x, y):
return type(x), type(y)
@dispatch(A, B)
def f(x, y):
return 0
assert f(A(), A()) == (A, A)
assert f(A(), C()) == (A, C)
assert f(A(), B()) == 0
assert f(C(), B()) == 0
assert raises(NotImplementedError, lambda: f(B(), B()))
def test_competing_solutions(dispatch):
@dispatch(A)
def h(x):
return 1
@dispatch(C)
def h(x):
return 2
assert h(D()) == 2
def test_competing_multiple(dispatch):
@dispatch(A, B)
def h(x, y):
return 1
@dispatch(C, B)
def h(x, y):
return 2
assert h(D(), B()) == 2
def test_competing_ambiguous(dispatch):
@dispatch(A, C)
def f(x, y):
return 2
@dispatch(C, A)
def f(x, y):
return 2
assert f(A(), C()) == f(C(), A()) == 2
# assert raises(Warning, lambda : f(C(), C()))
def test_caching_correct_behavior(dispatch):
@dispatch(A)
def f(x):
return 1
assert f(C()) == 1
@dispatch(C)
def f(x):
return 2
assert f(C()) == 2
def test_union_types(dispatch):
@dispatch((A, C))
def f(x):
return 1
assert f(A()) == 1
assert f(C()) == 1
def test_namespaces():
ns1 = dict()
ns2 = dict()
def foo(x):
return 1
foo1 = orig_dispatch(int, namespace=ns1)(foo)
def foo(x):
return 2
foo2 = orig_dispatch(int, namespace=ns2)(foo)
assert foo1(0) == 1
assert foo2(0) == 2
"""
Fails
def test_dispatch_on_dispatch(dispatch):
@dispatch(A)
@dispatch(C)
def q(x):
return 1
assert q(A()) == 1
assert q(C()) == 1
"""
def test_methods(dispatch):
class Foo(object):
@dispatch(float)
def f(self, x):
return x - 1
@dispatch(int)
def f(self, x):
return x + 1
@dispatch(int)
def g(self, x):
return x + 3
foo = Foo()
assert foo.f(1) == 2
assert foo.f(1.0) == 0.0
assert foo.g(1) == 4
def test_methods_multiple_dispatch(dispatch):
class Foo(object):
@dispatch(A, A)
def f(x, y):
return 1
@dispatch(A, C)
def f(x, y):
return 2
foo = Foo()
assert foo.f(A(), A()) == 1
assert foo.f(A(), C()) == 2
assert foo.f(C(), C()) == 2