Test viz in CI

.github/workflows/test_viz.yml

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+name: Test viz
+
+on:
+  push:
+    paths:
+      - 'examples/**/app.py'  # If an example visualisation is modified
+      - 'examples/**/viz.py'  # If an example visualisation is modified
+      - 'viz.py'  # If the test script is modified
+      - '.github/workflows/test_viz.yml'  # If this workflow is modified
+  pull_request:
+    paths:
+      - 'examples/**/*.py'
+      - 'test_examples.py'
+      - '.github/workflows/test_examples.yml'
+  workflow_dispatch:
+  schedule:
+    - cron: '0 6 * * 1'  # Monday at 6:00 UTC
+
+jobs:
+  # build-stable:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #   - uses: actions/checkout@v4
+  #   - name: Set up Python
+  #     uses: actions/setup-python@v5
+  #     with:
+  #       python-version: "3.12"
+  #   - name: Install dependencies
+  #     run: pip install mesa pytest
+  #   - name: Test with pytest
+  #     run: pytest -rA -Werror test_examples.py
+
+  build-pre:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.12"
+    - name: Install dependencies
+      run: |
+        pip install --pre mesa[viz]
+        pip install .[test]
+    - name: Test with pytest
+      run: pytest -rA -Werror -Wdefault::FutureWarning viz.py
+
+#  build-main:
+#    runs-on: ubuntu-latest
+#    steps:
+#    - uses: actions/checkout@v4
+#    - name: Set up Python
+#      uses: actions/setup-python@v5
+#      with:
+#        python-version: "3.12"
+#    - name: Install dependencies
+#      run: |
+#        pip install .[test]
+#        pip install -U git+https://github.com/projectmesa/mesa@main#egg=mesa
+#    - name: Test with pytest
+#      run: pytest -rA -Werror -Wdefault::FutureWarning test_examples.py

viz.py

@@ -0,0 +1,88 @@
+import importlib
+import os
+import sys
+import time
+import pytest
+from mesa.visualization import SolaraViz
+
+def get_viz_files(directory):
+    viz_files = []
+    for root, dirs, files in os.walk(directory):
+        for file in files:
+            if file in ['app.py', 'viz.py']:
+                module_name = os.path.relpath(os.path.join(root, file[:-3])).replace(
+                    os.sep, "."
+                )
+                viz_files.append(module_name)
+    return viz_files
+
+@pytest.mark.parametrize("module_name", get_viz_files("examples"))
+def test_solara_viz(module_name):
+    # Add the 'examples' directory to the Python path
+    examples_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'examples'))
+    sys.path.insert(0, examples_dir)
+
+    # Add the parent directory of the module to the Python path
+    module_parent_dir = os.path.abspath(os.path.join(examples_dir, os.path.dirname(module_name.replace('.', os.sep))))
+    if module_parent_dir not in sys.path:
+        sys.path.insert(0, module_parent_dir)
+
+    # Import the visualization module
+    module = importlib.import_module(module_name)
+
+    # Find the SolaraViz instance
+    solara_viz = None
+    for item_name in dir(module):
+        item = getattr(module, item_name)
+        if isinstance(item, SolaraViz):
+            solara_viz = item
+            break
+
+    assert solara_viz is not None, f"No SolaraViz instance found in {module_name}"
+
+    # Get the model instance
+    model = solara_viz.model
+
+    # Store the initial state
+    initial_step = model.steps
+
+    # Do 3 steps
+    for _ in range(3):
+        model.step()
+    assert model.steps == initial_step + 3
+
+    # Pause (no actual pause needed in this context)
+
+    # 3 more steps
+    for _ in range(3):
+        model.step()
+    assert model.steps == initial_step + 6
+
+    # Reset
+    model_params = solara_viz.model_params
+    new_model = model.__class__(**model_params)
+    solara_viz.model = new_model
+    model = new_model
+
+    assert model.steps == 0 or model.steps == initial_step
+
+    # Run steps for 5 seconds
+    start_time = time.time()
+    while time.time() - start_time < 5:
+        model.step()
+
+    # Pause (no actual pause needed in this context)
+
+    # Check if the step counter has increased
+    assert model.steps > 0, "Model did not advance steps"
+
+    print(f"Test completed for {module_name}. Final step count: {model.steps}")
+
+    # Remove the added directories from the Python path
+    sys.path.pop(0)
+    if module_parent_dir in sys.path:
+        sys.path.remove(module_parent_dir)
+
+# Run the tests
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])