Add acceptance tests for RF metadata coming from handlers

Complements #40

Author: Tattoo

tasks.py

@@ -1,5 +1,9 @@
+import os
+
 from pathlib import Path
 from platform import system
+from tempfile import mkstemp
+from textwrap import dedent
 
 from invoke import run, task
 
@@ -48,18 +52,35 @@ def coverage(context):
         pty=(not system() == 'Windows'))
     run('coverage html')
 
+def _setup_atest():
+    _, tempconf =  mkstemp()
+    with open(tempconf, 'w') as f:
+        f.write('''dummy_handler_metadata:
+            handler: MyDummyMetadataHandler
+            keyword: run_metadata_dummy_handler
+            tags: oxygen-metadata''')
+    return (tempconf,
+            os.pathsep.join([str(SRCPATH),
+                             str(UNIT_TESTS / 'resources' / 'my_dummy_handlers')]))
+
 @task(help={
     'rf': 'Additional command-line arguments for Robot Framework as '
           'single string. E.g: invoke atest --rf "--name my_suite"'
 })
 def atest(context, rf=''):
-    run(f'robot '
-        f'--pythonpath {str(SRCPATH)} '
-        f'--dotted '
-        f'{rf} '
-        f'--listener oxygen.listener '
-        f'{str(CURDIR / "tests" / "atest")}',
-        pty=(not system() == 'Windows'))
+    tempconf, pythonpath = _setup_atest()
+    run(f'python -m oxygen --add-config {tempconf}',
+        env={'PYTHONPATH': pythonpath})
+    try:
+        run(f'robot '
+            f'--pythonpath {pythonpath} '
+            f'--dotted '
+            f'{rf} '
+            f'--listener oxygen.listener '
+            f'{str(CURDIR / "tests" / "atest")}',
+            pty=(not system() == 'Windows'))
+    finally:
+        run('python -m oxygen --reset-config', env={'PYTHONPATH': pythonpath})
 
 @task
 def test(context):

tests/atest/metadata.robot

@@ -0,0 +1,9 @@
+*** Settings ***
+Library     oxygen.OxygenLibrary
+Metadata    RF suite    This metadata comes from the suite file itself
+
+*** Test Cases ***
+Metadata returned by handler should be visible
+    [Documentation]    This test is replaced with fix results that have metadata in them
+    Run Metadata Dummy Handler    doesentmatter
+

tests/resources/my_dummy_handlers/dummy_handler_metadata.py

@@ -0,0 +1,21 @@
+from oxygen import BaseHandler
+
+class MyDummyMetadataHandler(BaseHandler):
+    def run_metadata_dummy_handler(self, result_file):
+        return result_file
+
+    def parse_results(self, result_file):
+        return {
+            'name': 'Minimal Suite',
+            'metadata': {
+                'Main-level metadata': 'This should come *from handler*'
+            },
+            'suites': [{
+                'name': 'Minimal Subsuite',
+                'metadata': { 'Sub-level metadata': '_Inner_ metadata' },
+                'tests': [{
+                    'name': 'Minimal TC',
+                    'keywords': [{ 'name': 'someKeyword', 'pass': True }]
+                }]
+            }]
+        }