1 files changed, 70 insertions, 0 deletions
diff --git a/spec/ruby/shared/kernel/at_exit.rb b/spec/ruby/shared/kernel/at_exit.rb
new file mode 100644
index 0000000000..16d41cb01c
--- /dev/null
+++ b/spec/ruby/shared/kernel/at_exit.rb
@@ -0,0 +1,70 @@
+describe :kernel_at_exit, shared: true do
+  it "runs after all other code" do
+    ruby_exe("#{@method} { print 5 }; print 6").should == "65"
+  end
+
+  it "runs in reverse order of registration" do
+    code = "#{@method} { print 4 }; #{@method} { print 5 }; print 6; #{@method} { print 7 }"
+    ruby_exe(code).should == "6754"
+  end
+
+  it "allows calling exit inside a handler" do
+    code = "#{@method} { print 3 }; #{@method} { print 4; exit; print 5 }; #{@method} { print 6 }"
+    ruby_exe(code).should == "643"
+  end
+
+  it "gives access to the last raised exception - global variables $! and $@" do
+    code = <<-EOC
+      #{@method} {
+        puts "The exception matches: \#{$! == $exception && $@ == $exception.backtrace} (message=\#{$!.message})"
+      }
+
+      begin
+        raise "foo"
+      rescue => $exception
+        raise
+      end
+    EOC
+
+    result = ruby_exe(code, args: "2>&1", exit_status: 1)
+    result.lines.should.include?("The exception matches: true (message=foo)\n")
+  end
+
+  it "both exceptions in a handler and in the main script are printed" do
+    code = "#{@method} { raise 'at_exit_error' }; raise 'main_script_error'"
+    result = ruby_exe(code, args: "2>&1", exit_status: 1)
+    result.should.include?('at_exit_error (RuntimeError)')
+    result.should.include?('main_script_error (RuntimeError)')
+  end
+
+  it "decides the exit status if both at_exit and the main script raise SystemExit" do
+    ruby_exe("#{@method} { exit 43 }; exit 42", args: "2>&1", exit_status: 43)
+    $?.exitstatus.should == 43
+  end
+
+  it "runs all handlers even if some raise exceptions" do
+    code = "#{@method} { STDERR.puts 'last' }; #{@method} { exit 43 }; #{@method} { STDERR.puts 'first' }; exit 42"
+    result = ruby_exe(code, args: "2>&1", exit_status: 43)
+    result.should == "first\nlast\n"
+    $?.exitstatus.should == 43
+  end
+
+  it "runs handlers even if the main script fails to parse" do
+    script = fixture(__FILE__, "#{@method}.rb")
+    result = ruby_exe('{', options: "-r#{script}", args: "2>&1", exit_status: 1)
+    $?.should_not.success?
+    result.should.include?("handler ran\n")
+
+    # it's tempting not to rely on error message and rely only on exception class name,
+    # but CRuby before 3.2 doesn't print class name for syntax error
+    result.should include_any_of("syntax error", "SyntaxError")
+  end
+
+  it "calls the nested handler right after the outer one if a handler is nested into another handler" do
+    ruby_exe(<<~ruby).should == "last\nbefore\nafter\nnested\nfirst\n"
+        #{@method} { puts :first }
+        #{@method} { puts :before; #{@method} { puts :nested }; puts :after };
+        #{@method} { puts :last }
+    ruby
+  end
+end