Covered the #load_yaml method with test

lib/logstash/plugin_mixins/jdbc/value_tracking.rb

@@ -1,5 +1,7 @@
 # encoding: utf-8
 require "yaml" # persistence
+require "date"
+require "bigdecimal"
 
 module LogStash module PluginMixins module Jdbc
   class ValueTracking
@@ -32,7 +34,7 @@ def initialize(handler)
     end
 
     if Psych::VERSION&.split('.')&.first.to_i >= 4
-      YAML_PERMITTED_CLASSES = [DateTime, Time, BigDecimal].freeze
+      YAML_PERMITTED_CLASSES = [::DateTime, ::Time, ::BigDecimal].freeze
       def self.load_yaml(source)
         Psych::safe_load(source, permitted_classes: YAML_PERMITTED_CLASSES)
       end

spec/plugin_mixins/jdbc/value_tracking_spec.rb

@@ -0,0 +1,18 @@
+# encoding: utf-8
+require "logstash/plugin_mixins/jdbc/value_tracking"
+
+module LogStash module PluginMixins module Jdbc
+  describe ValueTracking do
+
+    let(:yaml_date_source) { "--- !ruby/object:DateTime '2023-06-15 09:59:30.558000000 +02:00'\n" }
+
+    context "#load_yaml" do
+      it "should load yaml with date string" do
+        parsed_date = LogStash::PluginMixins::Jdbc::ValueTracking.load_yaml(yaml_date_source)
+        expect(parsed_date.year).to eq 2023
+        expect(parsed_date.month).to eq 6
+        expect(parsed_date.day).to eq 15
+      end
+    end
+  end
+end end end