Write version_constraints as an array for inspec.lock (#2619)

* Modify version constraints to be an Array

This will allow both old and new versions of InSpec to parse the
`inspec.lock` correctly.

Signed-off-by: Jerry Aldrich <jerryaldrichiii@gmail.com>

lib/inspec/dependencies/requirement.rb

@@ -80,7 +80,7 @@ module Inspec
       h = {
         'name' => name,
         'resolved_source' => resolved_source,
-        'version_constraints' => version_constraints.to_s,
+        'version_constraints' => version_constraints,
       }
 
       if !dependencies.empty?

test/unit/dependencies/requirement_test.rb

@@ -2,8 +2,9 @@ require 'helper'
 require 'inspec/dependencies/requirement'
 
 describe Inspec::Requirement do
+  let(:req) { Inspec::Requirement.new('foo', constraints, nil, nil, {}) }
+
   describe '#source_satisfies_spec?' do
-    let(:req) { Inspec::Requirement.new('foo', constraints, nil, nil, {}) }
 
     describe 'when there are no version constraints' do
       let(:constraints) { nil }
@@ -72,4 +73,21 @@ describe Inspec::Requirement do
       end
     end
   end
+
+  describe '#to_hash' do
+    let(:constraints) { nil }
+    it 'returns the correct Hash' do
+      resolved_source = { compliance: 'spam', url: 'eggs', sha256: 'bacon' }
+      req.stubs(:resolved_source).returns(resolved_source)
+      req.stubs(:dependencies).returns({})
+
+      correct_hash = {
+        'name' => 'foo',
+        'resolved_source' => resolved_source,
+        'version_constraints' => [],
+      }
+
+      req.to_hash.must_equal correct_hash
+    end
+  end
 end