Compatibility with test-unit-ruby-core

Author: nobu

tool/lib/core_assertions.rb

@@ -74,7 +74,19 @@ def message msg = nil, ending = nil, &default
     module CoreAssertions
       require_relative 'envutil'
       require 'pp'
-      require '-test-/sanitizers'
+      begin
+        require '-test-/sanitizers'
+      rescue LoadError
+        # in test-unit-ruby-core gem
+        def sanitizers
+          nil
+        end
+      else
+        def sanitizers
+          Test::Sanitizers
+        end
+      end
+      module_function :sanitizers
 
       nil.pretty_inspect
 
@@ -159,7 +171,7 @@ def assert_no_memory_leak(args, prepare, code, message=nil, limit: 2.0, rss: fal
         pend 'assert_no_memory_leak may consider MJIT memory usage as leak' if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
         # ASAN has the same problem - its shadow memory greatly increases memory usage
         # (plus asan has better ways to detect memory leaks than this assertion)
-        pend 'assert_no_memory_leak may consider ASAN memory usage as leak' if Test::Sanitizers.asan_enabled?
+        pend 'assert_no_memory_leak may consider ASAN memory usage as leak' if sanitizers&.asan_enabled?
 
         require_relative 'memory_status'
         raise Test::Unit::PendedError, "unsupported platform" unless defined?(Memory::Status)
@@ -329,7 +341,7 @@ def assert_separately(args, file = nil, line = nil, src, ignore_stderr: nil, **o
         args << "--debug" if RUBY_ENGINE == 'jruby' # warning: tracing (e.g. set_trace_func) will not capture all events without --debug flag
         stdout, stderr, status = EnvUtil.invoke_ruby(args, src, capture_stdout, true, **opt)
 
-        if Test::Sanitizers.lsan_enabled?
+        if sanitizers&.lsan_enabled?
           # LSAN may output messages like the following line into stderr. We should ignore it.
           #   ==276855==Running thread 276851 was not suspended. False leaks are possible.
           # See https://github.com/google/sanitizers/issues/1479