test for pkg.conf before installing

lib/puppet/provider/package/pkgng.rb

@@ -39,9 +39,11 @@ Puppet::Type.type(:package).provide :pkgng, :parent => Puppet::Provider::Package
   end
 
   def install
-    should = @resource.should(:ensure)
-    cmd = ['install', '-qy', @resource[:name]]
-    pkg(*cmd)
+    if File.exists?('/usr/local/etc/pkg.conf')
+      pkg(['install', '-qy', resource[:name]])
+    else
+      raise Puppet::Error.new("/usr/local/etc/pkg.conf does not exist")
+    end
   end
 
   def uninstall

spec/unit/puppet/provider/pkgng_spec.rb

@@ -33,6 +33,13 @@ describe provider_class do
     end
   end
 
+  context "#install" do
+    it "should fail if pkg.conf does not exist" do
+      File.stub(:exist?).with('/usr/local/etc/pkg.conf') { false }
+      expect{ provider.install }.to raise_error(Puppet::Error, /pkg.conf does not exist/)
+    end
+  end
+
   context "#query" do
     it "should return the installed version if present" do
     end