Add snowplow helper for schema match

Add matcher for snowplow context schema assertion

spec/support/helpers/snowplow_helpers.rb

@@ -60,6 +60,10 @@ module SnowplowHelpers
       .with(category, action, **kwargs).at_least(:once)
   end
 
+  def match_snowplow_context_schema(schema_path:, context:)
+    expect(context).to match_snowplow_schema(schema_path)
+  end
+
   # Asserts that no call to `Gitlab::Tracking#event` was made.
   #
   # Example:

spec/support/matchers/schema_matcher.rb

@@ -45,6 +45,17 @@ RSpec::Matchers.define :match_response_schema do |schema, dir: nil, **options|
   end
 end
 
+RSpec::Matchers.define :match_snowplow_schema do |schema, dir: nil, **options|
+  match do |response|
+    schema_path = Pathname.new(SchemaPath.expand(schema, dir))
+    validator = SchemaPath.validator(schema_path)
+
+    data = Gitlab::Json.parse(response.body)
+
+    validator.valid?(data)
+  end
+end
+
 RSpec::Matchers.define :match_schema do |schema, dir: nil, **options|
   match do |data|
     schema = SchemaPath.expand(schema, dir)