system_spec.rb: add RubySpec for r62025

NEWS: added an entry for `exception: true` option.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62026 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -26,6 +26,10 @@ with all sufficient information, see the ChangeLog file or Redmine
 
     * added Dir#each_child and Dir#children instance methods.  [Feature #13969]
 
+* Kernel
+
+  * Kernel.#system takes :exception option to raise an exception on failure. [Feature #14386]
+
 * Proc
 
   * Proc#call doesn't change $SAFE any more. [Feature #14250]

spec/ruby/core/kernel/system_spec.rb

@@ -25,6 +25,14 @@ describe :kernel_system, shared: true do
     $?.exitstatus.should == 1
   end
 
+  it "raises RuntimeError when `exception: true` is given and the command exits with a non-zero exit status" do
+    lambda { @object.system(ruby_cmd('exit 1'), exception: true) }.should raise_error(RuntimeError)
+  end
+
+  it "raises Errno::ENOENT when `exception: true` is given and the specified command does not exist" do
+    lambda { @object.system('feature_14386', exception: true) }.should raise_error(Errno::ENOENT)
+  end
+
   it "returns nil when command execution fails" do
     @object.system("sad").should be_nil