1 files changed, 57 insertions, 0 deletions
diff --git a/test/dtrace/test_singleton_function.rb b/test/dtrace/test_singleton_function.rb
new file mode 100644
index 0000000000..bad1fa0692
--- /dev/null
+++ b/test/dtrace/test_singleton_function.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: false
+require_relative 'helper'
+
+module DTrace
+  class TestSingletonFunctionEntry < TestCase
+    def test_entry
+      probe = <<-eoprobe
+ruby$target:::method-entry
+/strstr(copyinstr(arg0), "Foo") != NULL/
+{
+  printf("%s %s %s %d\\n", copyinstr(arg0), copyinstr(arg1), copyinstr(arg2), arg3);
+}
+      eoprobe
+
+      trap_probe(probe, ruby_program) { |d_file, rb_file, probes|
+	foo_calls = probes.map { |line| line.split }.find_all { |row|
+	  row.first == 'Foo'  && row[1] == 'foo'
+	}
+
+	assert_equal 10, foo_calls.length, probes.inspect
+	line = '3'
+	foo_calls.each { |f| assert_equal line, f[3] }
+	foo_calls.each { |f| assert_equal rb_file, f[2] }
+      }
+    end
+
+    def test_exit
+      probe = <<-eoprobe
+ruby$target:::method-return
+{
+  printf("%s %s %s %d\\n", copyinstr(arg0), copyinstr(arg1), copyinstr(arg2), arg3);
+}
+      eoprobe
+
+      trap_probe(probe, ruby_program) { |d_file, rb_file, probes|
+	foo_calls = probes.map { |line| line.split }.find_all { |row|
+	  row.first == 'Foo'  && row[1] == 'foo'
+	}
+
+	assert_equal 10, foo_calls.length, probes.inspect
+	line = '3'
+	foo_calls.each { |f| assert_equal line, f[3] }
+	foo_calls.each { |f| assert_equal rb_file, f[2] }
+      }
+    end
+
+    def ruby_program
+      <<-eoruby
+      TracePoint.new{}.__enable(nil, nil, Thread.current)
+      class Foo
+	def self.foo; end
+      end
+      10.times { Foo.foo }
+      eoruby
+    end
+  end
+end if defined?(DTrace::TestCase)