Add testing

.gitignore

-root/
-build/pyodide.js
-build/pyodide.asm.*
 *.bc
 *.a
+.pytest_cache/
+__pycache__
 
-cpython/build
-cpython/downloads
-cpython/installs
+/root/
+/build/
 
-numpy/build
-numpy/host
-numpy/downloads
-numpy/.patched
\ No newline at end of file
+/cpython/build
+/cpython/downloads
+/cpython/installs
+
+/numpy/build
+/numpy/host
+/numpy/downloads
+/numpy/.patched
\ No newline at end of file

Makefile

@@ -44,6 +44,10 @@ build/pyodide.js: src/pyodide.js
 	cp $< $@
 
 
+test: all
+	py.test test
+
+
 clean:
 	rm -fr root
 	rm build/*

README.md

@@ -16,3 +16,14 @@ These instructions were tested on Linux. OSX should be substantively the same.
 3. Build this project.
 
    Type `make`.
+
+# Testing
+
+1. Install the following dependencies into the default Python installation:
+
+   `pip install pytest selenium`
+
+2. Install [geckodriver](https://github.com/mozilla/geckodriver/releases) somewhere
+   on your `PATH`.
+
+3. `make test`

test/conftest.py

+"""
+Various common utilities for testing.
+"""
+
+import pathlib
+
+import pytest
+
+
+TEST_PATH = pathlib.Path(__file__).parents[0].resolve()
+BUILD_PATH = TEST_PATH / '..' / 'build'
+
+
+class PyodideInited:
+    def __call__(self, driver):
+        inited = driver.execute_script("return pyodide.runPython")
+        return inited is not None
+
+
+class SeleniumWrapper:
+    def __init__(self):
+        from selenium.webdriver import Firefox
+        from selenium.webdriver.firefox.options import Options
+        from selenium.webdriver.support.wait import WebDriverWait
+
+        options = Options()
+        options.add_argument('-headless')
+        driver = Firefox(executable_path='geckodriver', firefox_options=options)
+        wait = WebDriverWait(driver, timeout=20)
+        driver.get((BUILD_PATH / "test.html").as_uri())
+        wait.until(PyodideInited())
+
+        self.driver = driver
+
+    @property
+    def logs(self):
+        return self.driver.execute_script("return window.logs")
+
+    def run(self, code):
+        return self.driver.execute_script(
+            'return pyodide.runPython({!r})'.format(code))
+
+    @property
+    def urls(self):
+        for handle in self.driver.window_handles:
+            self.driver.switch_to.window(handle)
+            yield self.driver.current_url
+
+
+@pytest.fixture
+def selenium():
+    return SeleniumWrapper()

test/test_numpy.py

+def test_numpy(selenium):
+    selenium.run("import numpy")
+    x = selenium.run("numpy.zeros((32, 64))")
+    assert len(x) == 32
+    assert all(len(y) == 64 for y in x)
+    for y in x:
+        assert all(z == 0 for z in y)

test/test_python.py

+import time
+
+
+def test_init(selenium):
+    assert 'Python initialization complete' in selenium.logs
+    assert len(selenium.driver.window_handles) == 1
+
+
+def test_webbrowser(selenium):
+    selenium.run("import antigravity")
+    time.sleep(2)
+    assert len(selenium.driver.window_handles) == 2
+    assert any('xkcd.com' in x for x in selenium.urls)
+
+
+def test_print(selenium):
+    selenium.run("print('This should be logged')")
+    assert 'This should be logged' in selenium.logs