wip: unit test ConsoleLogRecordExporter

Author: yuzurihaaa

test/unit/mocks.dart

@@ -1,6 +1,8 @@
 // Copyright 2021-2022 Workiva.
 // Licensed under the Apache License, Version 2.0. Please see https://github.com/Workiva/opentelemetry-dart/blob/master/LICENSE for more information
 
+import 'dart:async';
+
 import 'package:fixnum/fixnum.dart';
 import 'package:http/http.dart' as http;
 import 'package:mocktail/mocktail.dart';
@@ -29,4 +31,13 @@ class FakeTimeProvider extends Mock implements TimeProvider {
 
   @override
   Int64 get now => _now;
-}
+}
+
+// reference: https://stackoverflow.com/a/38709440/7676003
+void Function() overridePrint(void Function() testFn, Function(String msg) onPrint) => () {
+      final spec = ZoneSpecification(print: (_, __, ___, msg) {
+        // Add to log instead of printing to stdout
+        onPrint(msg);
+      });
+      return Zone.current.fork(specification: spec).run<void>(testFn);
+    };

test/unit/sdk/logs/exporters/console_log_record_exporter_test.dart

@@ -0,0 +1,50 @@
+// Copyright 2021-2022 Workiva.
+// Licensed under the Apache License, Version 2.0. Please see https://github.com/Workiva/opentelemetry-dart/blob/master/LICENSE for more information
+
+@TestOn('vm')
+import 'package:fixnum/fixnum.dart';
+import 'package:opentelemetry/api.dart' as api;
+import 'package:opentelemetry/sdk.dart' as sdk;
+import 'package:opentelemetry/src/experimental_sdk.dart' as sdk;
+import 'package:opentelemetry/src/sdk/logs/log_record_limit.dart';
+import 'package:test/test.dart';
+
+import '../../../mocks.dart';
+
+void main() {
+  List<String> log = <String>[];
+
+  tearDown(() {
+    log = <String>[];
+  });
+
+  test(
+      'Test exporter',
+      overridePrint(
+        () async {
+          final exporter = sdk.ConsoleLogRecordExporter();
+          final tracer = sdk.TracerProviderBase().getTracer('test');
+          final parent = tracer.startSpan('parent');
+          final context = api.contextWithSpan(api.Context.current, parent);
+          final logRecord = sdk.LogRecord(
+            instrumentationScope: sdk.InstrumentationScope('library_name', 'library_version', 'url://schema', []),
+            context: context,
+            logRecordLimits: LogRecordLimitsImpl(),
+            timeProvider: FakeTimeProvider(now: Int64(123)),
+            resource: sdk.Resource([api.Attribute.fromString('resource.name', 'test')]),
+          )
+            ..makeReadonly()
+            ..body = 'Log Message';
+          final spanContext = parent.spanContext;
+
+          await exporter.export([logRecord]);
+
+          expect(log, [
+            '{resource: {attributes: {resource.name: test}}, instrumentationScope: {name: library_name, version: library_version, schemaUrl: url://schema, attributes: {}}, timestamp: 123, severityText: null, severityNumber: null, body: null, attributes: {}, traceId: ${spanContext.traceId}, spanId: ${spanContext.spanId}, traceFlags: ${spanContext.traceFlags}}'
+          ]);
+
+          await exporter.shutdown();
+        },
+        log.add,
+      ));
+}