[GR-47629] Add spec for --cpusampler + Ctrl+C

Author: eregon

spec/truffle/tools_spec.rb

@@ -43,14 +43,12 @@
       out = ruby_exe(@file, options: "--coverage")
       out.should =~ /#{Regexp.escape @file}.+100(\.\d*)?%/
       out.should.include?("42")
-      $?.should.success?
     end
 
     it "works for internal sources" do
       out = ruby_exe(@file, options: "--coverage --experimental-options --coverage.TrackInternal")
       out.should =~ /#{Regexp.escape @file}.+100(\.\d*)?%/
       out.should.include?("42")
-      $?.should.success?
     end
   end
 
@@ -70,9 +68,27 @@ def foo
       RUBY
       out = ruby_exe(code, options: "--cpusampler")
       out.should.include?(":kill")
+      out.should.include?("Sampling Histogram")
       out.should.include?("Kernel#loop")
       out.should_not.include?('KillException')
-      $?.should.success?
+    end
+
+    it "works if interrupted by Ctrl+C" do
+      code = <<~RUBY
+      def foo
+        n = 0
+        loop { yield_self { n += 1 } }
+        n
+      end
+      Thread.new { foo }
+      sleep 0.1
+      Process.kill :INT, Process.pid
+      sleep
+      RUBY
+      out = ruby_exe(code, options: "--cpusampler", args: "2>&1", exit_status: :SIGINT)
+      out.should.include?('Interrupt (Interrupt)')
+      out.should.include?("Sampling Histogram")
+      out.should.include?("Kernel#loop")
     end
   end
 end