print server logs after test fails

mcserverwrapper/test/conftest.py

@@ -10,8 +10,10 @@
 import sys
 import pathlib
 
-from pytest import Metafunc
+import pytest
+from pytest import Metafunc, TestReport, Session, ExitCode
 
+from .helpers.common_helper import get_mcserver_log
 from .integration_tests import test_forge
 
 # Adding source path to sys path
@@ -26,7 +28,7 @@
 from .fixtures import newest_server_jar
 
 from .helpers.common_helper import get_vanilla_urls
-#pylint: enable=wrong-import-position
+# pylint: enable=wrong-import-position
 
 def pytest_generate_tests(metafunc: Metafunc):
     """Pytest hook"""
@@ -48,3 +50,42 @@ def pytest_generate_tests(metafunc: Metafunc):
         metafunc.parametrize(argnames="forge_download_url",
                              argvalues=test_forge.FORGE_URLS.values(),
                              ids=[f"test_version_{item}" for item in test_forge.FORGE_URLS])
+
+# the arguments are needed for the pytest hooks to work correctly
+# pylint: disable=unused-argument
+@pytest.hookimpl(wrapper=True, tryfirst=True)
+def pytest_runtest_makereport(item, call):
+    """Save mcserverwrapper.log to the current pytest item"""
+
+    # execute all other hooks to obtain the report object
+    rep: TestReport = yield
+
+    # we only look at actual failing test calls, not setup/teardown
+    if rep.when == "call" and rep.outcome == "failed":
+        item.mcserverlog = get_mcserver_log()
+
+    return rep
+
+@pytest.hookimpl(trylast=True)
+def pytest_sessionfinish(session: Session, exitstatus: ExitCode):
+    """Print all saved mcserverwrapper.log after all tests finished"""
+
+    if len(session.items) == 0:
+        return
+
+    print("")
+    print("")
+    print("=" * 20, end="")
+    print(" McServerWrapper.log ", end="")
+    print("=" * 20)
+
+    for item in session.items:
+        # skip tests that didn't fail
+        if hasattr(item, "mcserverlog"):
+            print("")
+            print("-" * 20, end="")
+            print(f" {item.name} ", end="")
+            print("-" * 20, end="\n")
+            for line in item.mcserverlog.split("\n"):
+                print(line)
+# pylint: enable=unused-argument

mcserverwrapper/test/helpers/common_helper.py

@@ -16,6 +16,8 @@
 
 from javascript import require, once
 
+from mcserverwrapper.src.util import logger
+
 mineflayer = require('mineflayer')
 
 def setup_workspace():
@@ -122,6 +124,19 @@ def download_file(url, counter=""):
             file.write(req.content)
     return local_filename
 
+def get_mcserver_log() -> str:
+    """Return the current mcserverwrapper.log as a string if it exists"""
+
+    if logger.logfile_path is None:
+        print("Logger was not yet setup, cannot print logfile")
+        return ""
+
+    data = f"Printing out {logger.LOGFILE_NAME}:\n"
+    with open(logger.logfile_path, "r", encoding="utf8") as f:
+        for line in f.readlines():
+            data += line
+    return data
+
 def get_vanilla_urls():
     """Function written by @Pfefan"""