+
+# Make sure GenerateFunctionInEnv and GenerateFunctionOutEnv work
+my $fn = { ELEMENTS => [ { DIRECTION => ["in"], NAME => "foo" } ] };
+is_deeply({ "foo" => "r->in.foo" }, GenerateFunctionInEnv($fn));
+
+$fn = { ELEMENTS => [ { DIRECTION => ["out"], NAME => "foo" } ] };
+is_deeply({ "foo" => "r->out.foo" }, GenerateFunctionOutEnv($fn));
+
+$fn = { ELEMENTS => [ { DIRECTION => ["out", "in"], NAME => "foo" } ] };
+is_deeply({ "foo" => "r->in.foo" }, GenerateFunctionInEnv($fn));
+
+$fn = { ELEMENTS => [ { DIRECTION => ["out", "in"], NAME => "foo" } ] };
+is_deeply({ "foo" => "r->out.foo" }, GenerateFunctionOutEnv($fn));
+
+$fn = { ELEMENTS => [ { DIRECTION => ["in"], NAME => "foo" } ] };
+is_deeply({ "foo" => "r->in.foo" }, GenerateFunctionOutEnv($fn));
+
+$fn = { ELEMENTS => [ { DIRECTION => ["out"], NAME => "foo" } ] };
+is_deeply({ }, GenerateFunctionInEnv($fn));
+
+$fn = { ELEMENTS => [ { NAME => "foo" }, { NAME => "bar" } ] };
+is_deeply({ foo => "r->foo", bar => "r->bar", this => "r" },
+ GenerateStructEnv($fn, "r"));
+
+$fn = { ELEMENTS => [ { NAME => "foo" }, { NAME => "bar" } ] };
+is_deeply({ foo => "some->complex.variable->foo",
+ bar => "some->complex.variable->bar",
+ this => "some->complex.variable" },
+ GenerateStructEnv($fn, "some->complex.variable"));
+
+$fn = { ELEMENTS => [ { NAME => "foo", PROPERTIES => { value => 3 }} ] };
+
+my $env = GenerateStructEnv($fn, "r");
+EnvSubstituteValue($env, $fn);
+is_deeply($env, { foo => 3, this => "r" });
+
+$fn = { ELEMENTS => [ { NAME => "foo" }, { NAME => "bar" } ] };
+$env = GenerateStructEnv($fn, "r");
+EnvSubstituteValue($env, $fn);
+is_deeply($env, { foo => 'r->foo', bar => 'r->bar', this => "r" });
+
+$fn = { ELEMENTS => [ { NAME => "foo", PROPERTIES => { value => 0 }} ] };
+
+$env = GenerateStructEnv($fn, "r");
+EnvSubstituteValue($env, $fn);
+is_deeply($env, { foo => 0, this => "r" });
+
+