1 files changed, 33 insertions, 3 deletions
diff --git a/test/ruby/test_trace.rb b/test/ruby/test_trace.rb
index 6adfe0bf64..5842f11aee 100644
--- a/test/ruby/test_trace.rb
+++ b/test/ruby/test_trace.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'test/unit'
 
 class TestTrace < Test::Unit::TestCase
@@ -7,15 +8,44 @@ class TestTrace < Test::Unit::TestCase
     trace_var :$x, proc{$y = $x}
     $x = 40414
     assert_equal($x, $y)
-    
+
     untrace_var :$x
     $x = 19660208
     assert_not_equal($x, $y)
-    
+
     trace_var :$x, proc{$x *= 2}
     $x = 5
     assert_equal(10, $x)
-    
+
+    untrace_var :$x
+  end
+
+  def test_trace_proc_that_raises_exception
+    $x = 1234
+    trace_var :$x, proc { raise }
+    assert_raise(RuntimeError) { $x = 42 }
+  ensure
     untrace_var :$x
   end
+
+  def test_trace_string
+    $x = 1234
+    trace_var :$x, "$y = :bar"
+    $x = 42
+    assert_equal(:bar, $y)
+  ensure
+    untrace_var :$x
+  end
+
+  def test_trace_break
+    bug2722 = '[ruby-core:31783]'
+    a = Object.new.extend(Enumerable)
+    def a.each
+      yield
+    end
+    assert(Thread.start {
+             Thread.current.add_trace_func(proc{})
+             a.any? {true}
+           }.value, bug2722)
+  end
 end