Use pytest (#705)

* Use pytest for tests

* Pin black

* Update CI

* Rename test_main to test_frappe_docker

* Force project name "test"

tests/utils.py

@@ -0,0 +1,85 @@
+import os
+import ssl
+import subprocess
+import sys
+import time
+from typing import Callable, Optional
+from urllib.error import HTTPError, URLError
+from urllib.request import Request, urlopen
+
+CI = os.getenv("CI")
+
+
+class Compose:
+    def __init__(self, project_name: str, env_file: str):
+        self.project_name = project_name
+        self.base_cmd = (
+            "docker",
+            "compose",
+            "-p",
+            project_name,
+            "--env-file",
+            env_file,
+        )
+
+    def __call__(self, *cmd: str) -> None:
+        file_args = [
+            "-f",
+            "compose.yaml",
+            "-f",
+            "overrides/compose.proxy.yaml",
+            "-f",
+            "overrides/compose.mariadb.yaml",
+            "-f",
+            "overrides/compose.redis.yaml",
+        ]
+        if CI:
+            file_args += ("-f", "tests/compose.ci.yaml")
+
+        args = self.base_cmd + tuple(file_args) + cmd
+        subprocess.check_call(args)
+
+    def exec(self, *cmd: str) -> None:
+        if sys.stdout.isatty():
+            self("exec", *cmd)
+        else:
+            self("exec", "-T", *cmd)
+
+    def stop(self) -> None:
+        subprocess.check_call(self.base_cmd + ("down", "-v", "--remove-orphans"))
+
+    def bench(self, *cmd: str) -> None:
+        self.exec("backend", "bench", *cmd)
+
+
+def check_url_content(
+    url: str, callback: Callable[[str], Optional[str]], site_name: str
+):
+    request = Request(url, headers={"Host": site_name})
+
+    # This is needed to check https override
+    ctx = ssl.create_default_context()
+    ctx.check_hostname = False
+    ctx.verify_mode = ssl.CERT_NONE
+
+    for _ in range(100):
+        try:
+            response = urlopen(request, context=ctx)
+
+        except HTTPError as exc:
+            if exc.code not in (404, 502):
+                raise
+
+        except URLError:
+            pass
+
+        else:
+            text: str = response.read().decode()
+            ret = callback(text)
+            if ret:
+                print(ret)
+                return
+
+        time.sleep(0.1)
+
+    raise RuntimeError(f"Couldn't ping {url}")