Standardise meta spec and add symbolized source doc

Refactored the meta spec to align it with the pattern provided in the links and attributes specs.  Incorporate symbolized source document tests inline with the attributes and relationships specs

Author: sa73917

spec/jsonapi/meta_spec.rb

@@ -1,25 +1,46 @@
-RSpec.describe JSONAPI::RSpec, '#have_meta' do
-  context 'when providing no value' do
-    it 'succeeds when meta is present' do
-      expect('meta' => {}).to have_meta
-    end
+RSpec.describe JSONAPI::RSpec do
+  json_doc =
+    {
+      'meta' => {
+        'foo' => 'bar'
+      }
+    }
 
-    it 'fails when meta is absent' do
-      expect({}).not_to have_meta
-    end
-  end
+  symbol_doc =
+    {
+      meta: {
+        foo: 'bar'
+      }
+    }
 
-  context 'when providing a value' do
-    it 'succeeds when meta matches' do
-      expect('meta' => { foo: 'bar' }).to have_meta(foo: 'bar')
-    end
+  describe '#have_meta' do
+    [json_doc, symbol_doc].each do |doc|
+      subject { doc }
+      before(:each) { RSpec.configuration.allow_symbolized_jsonapi = (doc == symbol_doc) }
 
-    it 'fails when meta mismatches' do
-      expect('meta' => { foo: 'bar' }).not_to have_meta(bar: 'baz')
-    end
+      context 'when providing no value' do
+        it 'succeeds when meta is present' do
+          is_expected.to have_meta
+        end
+
+        it 'fails when meta is absent' do
+          expect({}).not_to have_meta
+        end
+      end
+
+      context 'when providing a value' do
+        it 'succeeds when meta matches' do
+          is_expected.to have_meta('foo' => 'bar')
+        end
+
+        it 'fails when meta mismatches' do
+          is_expected.not_to have_meta('foo' => 'baz')
+        end
 
-    it 'fails when meta is absent' do
-      expect({}).not_to have_meta(foo: 'bar')
+        it 'fails when meta is absent' do
+          expect({}).not_to have_meta('foo' => 'bar')
+        end
+      end
     end
   end
 end