Rewrite nested json test to not use stackjdm/json-nested-test

Freebsd 10.1 i386 testers keep getting:
```
/opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1327:in `load': stack level too deep (SystemStackError)
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1327:in `block in load_spec_files'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1325:in `each'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1325:in `load_spec_files'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:102:in `setup'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:88:in `run'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:73:in `run'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:41:in `invoke'
	from /opt/chef/embedded/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/exe/rspec:4:in `<top (required)>'
	from /opt/chef/embedded/bin/rspec:23:in `load'
	from /opt/chef/embedded/bin/rspec:23:in `<main>'
```

We seem to keep changing the depth of the json object. Instead, let's
just not do it on the stack.

1 files changed, 4 insertions, 3 deletions

diff --git a/spec/unit/json_compat_spec.rb b/spec/unit/json_compat_spec.rb
index aaf0c48806..fd6469c146 100644
--- a/spec/unit/json_compat_spec.rb
+++ b/spec/unit/json_compat_spec.rb
@@ -72,8 +72,6 @@ describe Chef::JSONCompat do
     end
   end
 
-  # On FreeBSD 10.1 i386 rspec fails with a SystemStackError loading the expect line with more that 252 entries
-  # https://github.com/chef/chef/issues/3101
   describe "with the file with 252 or less nested entries" do
     let(:json) { IO.read(File.join(CHEF_SPEC_DATA, 'nested.json')) }
     let(:hash) { Chef::JSONCompat.from_json(json) }
@@ -84,7 +82,10 @@ describe Chef::JSONCompat do
       end
 
       it "should has 'test' as a 252 nested value" do
-        expect(hash['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']['key']).to eq('test')
+        v = 252.times.inject(hash) do |memo, _|
+          memo['key']
+        end
+        expect(v).to eq('test')
       end
     end
   end