Test preview properly

tests/test_preview.py

@@ -1,25 +1,107 @@
+import os
+from pathlib import Path
+import time
+
 from click.testing import CliRunner
 from htmd.cli import preview
+import pytest
+import requests
+import subprocess
+import sys
+
+
+def invoke_preview(run_start, args):
+    # this command fails (werkzeug reload tries to run pytest)
+    # but it tests coverage
+    run_start.invoke(preview, args)
+
+
+class run_preview:
+    def __init__(self, args: list[str] = []):
+        self.args = args
+
+    def __enter__(self):
+        cmd = [sys.executable, '-m', 'htmd', 'preview'] + self.args
+        self.task = subprocess.Popen(cmd, preexec_fn=os.setsid)
+        url = 'http://localhost:9090/'
+        count = 0
+        while count < 10:  # pragma: no branch
+            try:
+                requests.get(url)
+            except requests.exceptions.ConnectionError:
+                count += 1
+                time.sleep(0.1)
+            else:
+                break
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.task.terminate()
 
 
 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
+    url = 'http://localhost:9090/'
+    with pytest.raises(requests.exceptions.ConnectionError):
+        requests.get(url)
+    with run_preview():
+        response = requests.get(url)
+        assert response.status_code == 200
 
 
 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)
+            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)
+            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)
+            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)
+            assert response.status_code == status