[analyzer] how to use AnalysisOptionsFileConfig in testing analyzer_plugin

[asashour]

I am trying to fix some part of #49559, and couldn't find a way to control analysis_options.yaml, so it is read by the test method.

In sdk/259720, writeTestPackageAnalysisOptionsFile writes the file, however resolvedUnit.session.analysisContext.analysisOptions.lintRules doesn't seem to pick the changes.

In analysis_server, there is a similar method, with TODO to use AnalysisOptionsFileConfig

sdk/pkg/analysis_server/test/src/g3/fixes_test.dart

Lines 190 to 192 in e8b67cc

	/// Write an analysis options file based on the given arguments.
	/// TODO(scheglov) Use AnalysisOptionsFileConfig
	void _writeAnalysisOptionsFile({

so I understand the correct way is to use AnalysisOptionsFileConfig from the analyzer in

sdk/pkg/analyzer/test/src/dart/resolution/context_collection_resolution.dart

Line 42 in e8b67cc

class AnalysisOptionsFileConfig {

but I am not sure how this is possible to be called from the analyzer_plugin, since it is in test main folder, not in src

[bwilkerson]

@scheglov

[scheglov]

registerLintRules() from 'package:linter/src/rules.dart' should be called somewhere, e.g. in setUp().

[asashour]

Thanks a lot.