feat(oxygen): do not fail on robot suites that do not use Oxygen

Author: Matej Cotman

src/oxygen/oxygen.py

@@ -8,6 +8,7 @@
 
 from robot.api import ExecutionResult, ResultVisitor, ResultWriter
 from robot.libraries.BuiltIn import BuiltIn
+from robot.errors import DataError
 from yaml import load, FullLoader
 
 from .config import CONFIG_FILE
@@ -85,9 +86,12 @@ def __init__(self):
         self.run_time_data = {}
 
     def end_test(self, name, attributes):
-        lib = BuiltIn().get_library_instance('oxygen.OxygenLibrary')
-        if lib:
+        try:
+            lib = BuiltIn()._get_context().namespace.get_library_instance(
+                'oxygen.OxygenLibrary')
             self.run_time_data[attributes['longname']] = lib.data
+        except DataError as _:
+            pass
 
     def output_file(self, path):
         result = ExecutionResult(path)

tests/atest/test_with_import.robot

@@ -0,0 +1,16 @@
+*** Settings ***
+Library    oxygen.OxygenLibrary
+Library    OperatingSystem
+
+*** Variables ***
+${JUNIT XML FILE}=    ${CURDIR}${/}..${/}resources${/}junit-single-testsuite.xml
+
+*** Test Cases ***
+Oxygen's unit test with dynamic import
+    Import Library    oxygen.OxygenLibrary
+    Run JUnit     ${JUNIT XML FILE}
+    ...           echo Run JUnit Dynamically Imported
+
+Oxygen's unit test with global import
+    Run JUnit     ${JUNIT XML FILE}
+    ...           echo Run JUnit Globally Imported

tests/atest/test_without_import.robot

@@ -0,0 +1,3 @@
+*** Test Cases ***
+Oxygen's unit test without import
+    Log    Some text

tests/utest/oxygen/test_optional_oxygenlibrary.py

@@ -0,0 +1,16 @@
+from tasks import SRCPATH
+from unittest import TestCase
+from subprocess import run
+
+from ..helpers import RESOURCES_PATH
+
+
+class TestOptionalOxygenLibrary(TestCase):
+
+    def test_junit_works_on_cli(self):
+        run(f'robot --pythonpath {str(SRCPATH)}'
+            f'--dotted '
+            f'--listener oxygen.listener '
+            f'{str(RESOURCES_PATH / "dummy_tests")}',
+            check=True,
+            shell=True)