Merge pull request #1 from davidbrochart/tests

Add test

Author: davidbrochart

.github/workflows/test.yml

@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: [ '3.8', '3.9', '3.10', '3.11' ]
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: python3 -m pip install --upgrade pip
+
+    - name: Install ypywidgets in dev mode
+      run: |
+        pip install .[test]
+
+    - name: Run tests
+      run: |
+        pytest ./tests -v

pyproject.toml

@@ -8,7 +8,7 @@ dynamic = ["version"]
 description = "Attributes with superpowers"
 readme = "README.md"
 license = "MIT"
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 authors = [
     { name = "David Brochart", email = "[email protected]" },
 ]
@@ -19,6 +19,11 @@ keywords = [
 [project.urls]
 Homepage = "https://github.com/davidbrochart/reacttrs"
 
+[project.optional-dependencies]
+test = [
+    "pytest",
+]
+
 [tool.hatch.version]
 path = "reacttrs/__init__.py"
 

tests/test_reactive.py

@@ -0,0 +1,57 @@
+from textwrap import dedent
+
+from reacttrs import reactive
+
+
+class Foo:
+
+    name = reactive("Paul")
+    age = reactive(33)
+    birth = reactive(1990)
+
+    def watch_name(self, old, new):
+        print(f"{old=}, {new=}")
+
+    def validate_name(self, name):
+        if name == "John":
+            print("Hey John!")
+        return name
+
+    def compute_age(self) -> int:
+        age = 2023 - self.birth
+        print(f"{age=}")
+        return age
+
+
+def test(capfd):
+    foo = Foo()
+
+    foo.name = "John"
+    out, err = capfd.readouterr()
+    # watch_name is called first time unless `init=False`
+    assert out == dedent("""\
+        old='Paul', new='Paul'
+        Hey John!
+        old='Paul', new='John'
+    """)
+
+    foo.name = "Steve"
+    out, err = capfd.readouterr()
+    assert out == dedent("""\
+        old='John', new='Steve'
+    """)
+
+    foo.age
+    out, err = capfd.readouterr()
+    # compute_age is called first time unless `init=False`
+    assert out == dedent("""\
+        age=33
+        age=33
+    """)
+
+    foo.birth = 1991
+    foo.age
+    out, err = capfd.readouterr()
+    assert out == dedent("""\
+        age=32
+    """)