# Jestspectation
Pattern matching tools to test complex data structures.
The design is inspired by the `expect` system from JavaScript's Jest testing
framework.
```py
import jestspectation as expect
assert {
"a": 1,
"b": 2,
"c": 3.0,
} == {
"a": 1,
"b": expect.Any(int),
"c": expect.FloatApprox(2.5, magnitude=0.5)
}
```
## Installation
```sh
pip install jestspectation
```
## Usage with Pytest
The library can be used as a pytest plugin, which can give access to much more
detailed error messages when assertions fail.
This should result in output similar to the following
```txt
def test_goodbye():
> assert 1 == expect.Any(float)
E assert Type mismatch
E Expected any object of type float
E Received 1 (int)
```
These advanced completions can also be used for most standard Python objects
by wrapping the expected values in an `Equals`. For example:
```txt
def test_lists():
> assert expect.Equals([1, 2, 3, 4]) == [1, 2, 3, 5, 6]
E assert [1, 2, 3, 4] == [1, 2, 3, 5, 6]
E !! [3] 4 == 5
E Value mismatch
E Expected 4
E Received 5
E ++ [4] 6
```
To automatically use Jestspectation's diff parsing, you can configure
Jestspectation.
```py
import jestspectation
jestspectation.configure().pytest_all_diffs = True
```
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