Test preview properly

pyproject.toml

@@ -21,6 +21,7 @@ dependencies = [
   "htmlmin",
   "jsmin",
   "Pygments",
+  "requests",
 ]
 description = "Write Markdown and Jinja2 templates to create a website"
 maintainers = [
@@ -43,7 +44,7 @@ Repository = "https://github.com/siecje/htmd.git"
 
 [tool.ruff.lint]
 ignore = [
-  "D100", "D101", "D103", "D104",  "D203", "D211", "D212", "D213",
+  "D100", "D101", "D103", "D104", "D105", "D107", "D203", "D211", "D212", "D213",
   "INP001",
   "RET504",
   "S101",
@@ -65,11 +66,12 @@ lines-after-imports = 2
 order-by-type = false
 section-order = ["future", "standard-library", "third-party", "first-party", "local-folder"]
 
-[tool.ruff.per-file-ignores]
+[tool.ruff.lint.per-file-ignores]
 "tests/test_app.py" = ["ARG001"]
 "tests/test_build.py" = ["I001"]
 "tests/test_drafts.py" = ["ARG001", "I001"]
 "tests/test_post_dates.py" = ["I001"]
+"tests/test_preview.py" = ["I001"]
 "tests/test_verify.py" = ["I001"]
 
 [tool.setuptools]

requirements.txt

@@ -1,10 +1,11 @@
 beautifulsoup4==4.12.3
 click==8.1.7
 csscompressor==0.9.5
-feedwerk==1.1.0
+feedwerk==1.2.0
 Flask==3.0.1
 Flask-FlatPages==0.8.2
 Frozen-Flask==1.0.1
 htmlmin==0.1.12
 jsmin==3.0.1
 Pygments==2.17.2
+requests==2.31.0

tests/test_preview.py

@@ -1,25 +1,130 @@
+from pathlib import Path
+import time
+from types import TracebackType
+
 from click.testing import CliRunner
 from htmd.cli import preview
+import pytest
+import requests
+import subprocess
+import sys
+
+
+def invoke_preview(run_start: CliRunner, args: list[str]) -> None:
+    """
+    run_start.invoke(preview) fails but it is used to track test coverage.
+
+    I get a message that the path I pass to pytest is not found.
+    I've track it down to this subprocess call.
+    https://github.com/pallets/werkzeug/blob/d3dd65a27388fbd39d146caacf2563639ba622f0/src/werkzeug/_reloader.py#L273
+    str(args) is "['/path/to/venv/bin/python', '-m', 'pytest', 'tests']"
+    ERROR: file or directory not found: tests
+    Which is how I'm running my tests.
+    If I pass tests/test_preview.py then I see
+    ERROR: file or directory not found: tests/test_preview.py
+    """
+    run_start.invoke(preview, args)
+
 
+class run_preview:  # noqa: N801
+    def __init__(
+        self: 'run_preview',
+        args: list[str] | None = None,
+        max_tries: int = 10,
+    ) -> None:
+        self.args = args
+        self.max_tries = max_tries
 
-def test_preview(run_start: CliRunner) -> None:
-    result = run_start.invoke(preview)
-    # Why is this 5?
-    expected_exit_code = 5
-    assert result.exit_code == expected_exit_code
+    def __enter__(self: 'run_preview') -> None:
+        cmd = [sys.executable, '-m', 'htmd', 'preview']
+        if self.args:
+            cmd += self.args
+        self.task = subprocess.Popen(cmd)  # noqa: S603
+        url = 'http://localhost:9090/'
+        count = 0
+        while count < self.max_tries:  # pragma: no branch
+            try:
+                requests.get(url, timeout=1)
+            except requests.exceptions.ConnectionError:
+                count += 1
+                time.sleep(0.1)
+            else:
+                break
+
+    def __exit__(
+        self: 'run_preview',
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:
+        self.task.terminate()
+
+
+def test_preview(run_start: CliRunner) -> None:  # noqa: ARG001
+    url = 'http://localhost:9090/'
+    with pytest.raises(requests.exceptions.ConnectionError):
+        requests.get(url, timeout=1)
+    success = 200
+    with run_preview():
+        response = requests.get(url, timeout=0.01)
+        assert response.status_code == success
 
 
 def test_preview_css_minify_js_minify(run_start: CliRunner) -> None:
-    run_start.invoke(preview, ['--css-minify', '--js-minify'])
+    args = ['--css-minify', '--js-minify']
+    invoke_preview(run_start, args)
+    urls = (
+        (200, 'http://localhost:9090/static/combined.min.css'),
+        (200, 'http://localhost:9090/static/combined.min.js'),
+    )
+    js_path = Path('static') / 'scripts.js'
+    with js_path.open('w') as js_file:
+        js_file.write('document.getElementsByTagName("body");')
+
+    with run_preview(args):
+        for status, url in urls:
+            response = requests.get(url, timeout=0.01)
+            assert response.status_code == status
 
 
 def test_preview_no_css_minify(run_start: CliRunner) -> None:
-    run_start.invoke(preview, ['--no-css-minify', '--js-minify'])
+    args = ['--no-css-minify', '--js-minify']
+    invoke_preview(run_start, args)
+    urls = (
+        (404, 'http://localhost:9090/static/combined.min.css'),
+        (200, 'http://localhost:9090/static/combined.min.js'),
+    )
+    js_path = Path('static') / 'scripts.js'
+    with js_path.open('w') as js_file:
+        js_file.write('document.getElementsByTagName("body");')
+
+    with run_preview(args):
+        for status, url in urls:
+            response = requests.get(url, timeout=0.01)
+            assert response.status_code == status
 
 
 def test_preview_css_minify_no_js_minify(run_start: CliRunner) -> None:
-    run_start.invoke(preview, ['--css-minify', '--no-js-minify'])
+    args = ['--css-minify', '--no-js-minify']
+    invoke_preview(run_start, args)
+    urls = (
+        (200, 'http://localhost:9090/static/combined.min.css'),
+        (404, 'http://localhost:9090/static/combined.min.js'),
+    )
+    with run_preview(args):
+        for status, url in urls:
+            response = requests.get(url, timeout=0.01)
+            assert response.status_code == status
 
 
 def test_preview_no_css_minify_no_js_minify(run_start: CliRunner) -> None:
-    run_start.invoke(preview, ['--no-css-minify', '--no-js-minify'])
+    args = ['--no-css-minify', '--no-js-minify']
+    invoke_preview(run_start, args)
+    urls = (
+        (404, 'http://localhost:9090/static/combined.min.css'),
+        (404, 'http://localhost:9090/static/combined.min.js'),
+    )
+    with run_preview(args):
+        for status, url in urls:
+            response = requests.get(url, timeout=0.01)
+            assert response.status_code == status