Update specs

spec/helpers/ruby_exe_spec.rb

@@ -147,7 +147,7 @@ class RubyExeSpecs
     @script = RubyExeSpecs.new
     allow(@script).to receive(:`).and_return('OUTPUT')
 
-    status_successful = double(Process::Status,  exitstatus: 0)
+    status_successful = double(Process::Status, exited?: true, exitstatus: 0)
     allow(Process).to receive(:last_status).and_return(status_successful)
   end
 
@@ -176,24 +176,24 @@ class RubyExeSpecs
     code = "code"
     options = {}
 
-    status_failed = double(Process::Status, exitstatus: 4)
+    status_failed = double(Process::Status, exited?: true, exitstatus: 4)
     allow(Process).to receive(:last_status).and_return(status_failed)
 
     expect {
       @script.ruby_exe(code, options)
     }.to raise_error(%r{Expected exit status is 0 but actual is 4 for command ruby_exe\(.+\)})
   end
 
-  it "shows in the exception message if exitstatus is nil (e.g., signal)" do
+  it "shows in the exception message if a signal killed the process" do
     code = "code"
     options = {}
 
-    status_failed = double(Process::Status, exitstatus: nil)
+    status_failed = double(Process::Status, exited?: false, signaled?: true, termsig: Signal.list.fetch('TERM'))
     allow(Process).to receive(:last_status).and_return(status_failed)
 
     expect {
       @script.ruby_exe(code, options)
-    }.to raise_error(%r{Expected exit status is 0 but actual is nil for command ruby_exe\(.+\)})
+    }.to raise_error(%r{Expected exit status is 0 but actual is :SIGTERM for command ruby_exe\(.+\)})
   end
 
   describe "with :dir option" do
@@ -236,7 +236,7 @@ class RubyExeSpecs
 
   describe "with :exit_status option" do
     before do
-      status_failed = double(Process::Status, exitstatus: 4)
+      status_failed = double(Process::Status, exited?: true, exitstatus: 4)
       allow(Process).to receive(:last_status).and_return(status_failed)
     end