|
1
|
|
|
import io |
|
2
|
|
|
import typing |
|
3
|
|
|
from typing import List |
|
4
|
|
|
|
|
5
|
|
|
import pytest |
|
6
|
|
|
|
|
7
|
|
|
from lagom import Container |
|
8
|
|
|
from lagom.definitions import UnresolvableTypeDefinition |
|
9
|
|
|
from lagom.exceptions import ( |
|
10
|
|
|
UnresolvableType, |
|
11
|
|
|
RecursiveDefinitionError, |
|
12
|
|
|
TypeResolutionBlocked, |
|
13
|
|
|
) |
|
14
|
|
|
|
|
15
|
|
|
|
|
16
|
|
|
class MyMissingDep: |
|
17
|
|
|
def __init__(self, _stuff: str): |
|
18
|
|
|
pass |
|
19
|
|
|
|
|
20
|
|
|
|
|
21
|
|
|
class UnfulfilledDeps: |
|
22
|
|
|
def __init__(self, _stuff: MyMissingDep): |
|
23
|
|
|
pass |
|
24
|
|
|
|
|
25
|
|
|
|
|
26
|
|
|
class SomeDep: |
|
27
|
|
|
pass |
|
28
|
|
|
|
|
29
|
|
|
|
|
30
|
|
|
@pytest.mark.parametrize("dep", [str, int, float, bool, bytes, bytearray]) |
|
31
|
|
|
def test_simple_objects_cannot_be_resolved(container: Container, dep): |
|
32
|
|
|
with pytest.raises(UnresolvableType): |
|
33
|
|
|
container.resolve(dep) |
|
34
|
|
|
|
|
35
|
|
|
|
|
36
|
|
|
@pytest.mark.parametrize( |
|
37
|
|
|
"dep", |
|
38
|
|
|
[ |
|
39
|
|
|
io.BytesIO, |
|
40
|
|
|
io.FileIO, |
|
41
|
|
|
io.IOBase, |
|
42
|
|
|
io.RawIOBase, |
|
43
|
|
|
io.TextIOBase, |
|
44
|
|
|
io.BufferedIOBase, |
|
45
|
|
|
io.BufferedRandom, |
|
46
|
|
|
io.BufferedReader, |
|
47
|
|
|
io.BufferedRWPair, |
|
48
|
|
|
io.BufferedWriter, |
|
49
|
|
|
typing.IO, |
|
50
|
|
|
typing.TextIO, |
|
51
|
|
|
typing.BinaryIO, |
|
52
|
|
|
], |
|
53
|
|
|
) |
|
54
|
|
|
def test_generic_io_cant_be_resolved(container: Container, dep): |
|
55
|
|
|
with pytest.raises(UnresolvableType): |
|
56
|
|
|
container.resolve(dep) |
|
57
|
|
|
|
|
58
|
|
|
|
|
59
|
|
|
def test_raises_error_with_the_dep_that_couldnt_be_built(container): |
|
60
|
|
|
with pytest.raises(UnresolvableType): |
|
61
|
|
|
container.resolve(MyMissingDep) |
|
62
|
|
|
|
|
63
|
|
|
|
|
64
|
|
|
def test_raises_error_with_the_dep_that_couldnt_be_built_at_the_top_level(container): |
|
65
|
|
|
with pytest.raises(UnresolvableType) as e_info: |
|
66
|
|
|
container.resolve(UnfulfilledDeps) |
|
67
|
|
|
assert ( |
|
68
|
|
|
"Unable to construct dependency of type UnfulfilledDeps " |
|
69
|
|
|
"The constructor probably has some unresolvable dependencies" |
|
70
|
|
|
in str(e_info.value) |
|
71
|
|
|
) |
|
72
|
|
|
|
|
73
|
|
|
|
|
74
|
|
|
def test_composite_type_failures_still_throw_sensible_errors(container): |
|
75
|
|
|
with pytest.raises(UnresolvableType) as e_info: |
|
76
|
|
|
container.resolve(List[UnfulfilledDeps]) |
|
77
|
|
|
exception_message = str(e_info.value) |
|
78
|
|
|
assert "Unable to construct dependency of type" in exception_message |
|
79
|
|
|
assert "List[tests.test_error_handling.UnfulfilledDeps]" in exception_message |
|
80
|
|
|
assert ( |
|
81
|
|
|
"The constructor probably has some unresolvable dependencies" |
|
82
|
|
|
in exception_message |
|
83
|
|
|
) |
|
84
|
|
|
|
|
85
|
|
|
|
|
86
|
|
|
def test_types_can_be_explicitly_made_unresolvable(container: Container): |
|
87
|
|
|
container[SomeDep] = UnresolvableTypeDefinition( |
|
88
|
|
|
SomeDep, "You can't resolve SomeDep" |
|
|
|
|
|
|
89
|
|
|
) |
|
90
|
|
|
with pytest.raises(TypeResolutionBlocked) as err: |
|
91
|
|
|
container.resolve(SomeDep) |
|
92
|
|
|
assert "You can't resolve SomeDep" in str(err.value) |
|
93
|
|
|
|
|
94
|
|
|
|
|
95
|
|
|
def test_types_can_be_explicitly_made_unresolvable_with_a_custom_exception( |
|
96
|
|
|
container: Container, |
|
97
|
|
|
): |
|
98
|
|
|
container[SomeDep] = UnresolvableTypeDefinition(SomeDep, SyntaxError("nopes")) |
|
|
|
|
|
|
99
|
|
|
with pytest.raises(SyntaxError) as err: |
|
100
|
|
|
container.resolve(SomeDep) |
|
101
|
|
|
assert str(err.value) == "nopes" |
|
102
|
|
|
|
|
103
|
|
|
|
|
104
|
|
|
class A: |
|
105
|
|
|
def __init__(self, b: "B"): |
|
106
|
|
|
pass |
|
107
|
|
|
|
|
108
|
|
|
|
|
109
|
|
|
class B: |
|
110
|
|
|
def __init__(self, a: "A"): |
|
111
|
|
|
pass |
|
112
|
|
|
|
|
113
|
|
|
|
|
114
|
|
|
@pytest.mark.skip( |
|
115
|
|
|
reason="This behaviour is a nice to have but is execution env dependent" |
|
116
|
|
|
) |
|
117
|
|
|
def test_circular_imports_raise_a_clear_error(container): |
|
118
|
|
|
with pytest.raises(RecursiveDefinitionError) as e_info: |
|
119
|
|
|
container.resolve(A) |
|
120
|
|
|
err_string = str(e_info.value) |
|
121
|
|
|
assert "When trying to build dependency of type " in err_string |
|
122
|
|
|
assert "This could indicate a circular definition somewhere." in err_string |
|
123
|
|
|
|
|
124
|
|
|
|
|
125
|
|
|
class MyTypedHTTPClient: |
|
126
|
|
|
def __init__(self, _stuff: MyMissingDep): |
|
127
|
|
|
pass |
|
128
|
|
|
|
|
129
|
|
|
|
|
130
|
|
|
class MyDataProvider: |
|
131
|
|
|
def __init__(self, _stuff: MyTypedHTTPClient): |
|
132
|
|
|
pass |
|
133
|
|
|
|
|
134
|
|
|
|
|
135
|
|
|
class MyService: |
|
136
|
|
|
def __init__(self, _stuff: MyDataProvider): |
|
137
|
|
|
pass |
|
138
|
|
|
|
|
139
|
|
|
|
|
140
|
|
|
def test_error_displays_dependency_list(container): |
|
141
|
|
|
with pytest.raises(UnresolvableType) as e_info: |
|
142
|
|
|
container.resolve(MyService) |
|
143
|
|
|
assert ( |
|
144
|
|
|
str(e_info.value) == "Unable to construct dependency of type MyService " |
|
145
|
|
|
"The constructor probably has some unresolvable dependencies: " |
|
146
|
|
|
"MyService => MyDataProvider => MyTypedHTTPClient => MyMissingDep => str => str" |
|
147
|
|
|
) |
|
148
|
|
|
|
meadsteve /
lagom
Loading history...