Adding a utility function for lambda method handles in struct

Author: svorenova

unit/testing-utils/require_type.cpp

@@ -480,3 +480,31 @@ java_generic_symbol_typet require_type::require_java_generic_symbol_type(
 
   return generic_base_type;
 }
+
+/// Verify that the lambda method handles of a class match the given
+/// expectation.
+/// \param class_struct class type to be verified
+/// \param expected_identifiers expected list of lambda method handle
+///   references
+/// \return lambda method handles of the class
+require_type::java_lambda_method_handlest
+require_type::require_lambda_method_handles(
+  const java_class_typet &class_type,
+  const std::vector<std::string> &expected_identifiers)
+{
+  const require_type::java_lambda_method_handlest &lambda_method_handles =
+    class_type.lambda_method_handles();
+  REQUIRE(lambda_method_handles.size() == expected_identifiers.size());
+
+  REQUIRE(
+    std::equal(
+      lambda_method_handles.begin(),
+      lambda_method_handles.end(),
+      expected_identifiers.begin(),
+      [](
+        const symbol_exprt &lambda_method_handle,
+        const std::string &expected_identifier) { //NOLINT
+        return lambda_method_handle.get_identifier() == expected_identifier;
+      }));
+  return lambda_method_handles;
+}

unit/testing-utils/require_type.h

@@ -115,6 +115,13 @@ java_generic_symbol_typet require_java_generic_symbol_type(
   const typet &type,
   const std::string &identifier,
   const require_type::expected_type_argumentst &type_expectations);
+
+typedef java_class_typet::java_lambda_method_handlest
+  java_lambda_method_handlest;
+
+java_lambda_method_handlest require_lambda_method_handles(
+  const java_class_typet &class_type,
+  const std::vector<std::string> &expected_identifiers);
 }
 
 #endif // CPROVER_TESTING_UTILS_REQUIRE_TYPE_H