2 files changed, 24 insertions, 5 deletions
diff --git a/spec/hashie/extensions/mash/symbolize_keys_spec.rb b/spec/hashie/extensions/mash/symbolize_keys_spec.rb
index 9846737..bf58ea1 100644
--- a/spec/hashie/extensions/mash/symbolize_keys_spec.rb
+++ b/spec/hashie/extensions/mash/symbolize_keys_spec.rb
@@ -9,12 +9,30 @@ RSpec.describe Hashie::Extensions::Mash::SymbolizeKeys do
     end.to raise_error(ArgumentError)
   end
 
-  it 'symbolizes all keys in the Mash' do
-    my_mash = Class.new(Hashie::Mash) do
+  context 'when included in a Mash' do
+    class SymbolizedMash < Hashie::Mash
       include Hashie::Extensions::Mash::SymbolizeKeys
     end
 
-    expect(my_mash.new('test' => 'value').to_h).to eq(test: 'value')
+    it 'symbolizes string keys in the Mash' do
+      my_mash = SymbolizedMash.new('test' => 'value')
+      expect(my_mash.to_h).to eq(test: 'value')
+    end
+
+    it 'preserves keys which cannot be symbolized' do
+      my_mash = SymbolizedMash.new(
+        '1' => 'symbolizable one',
+        1 => 'one',
+        [1, 2, 3] => 'testing',
+        { 'test' => 'value' } => 'value'
+      )
+      expect(my_mash.to_h).to eq(
+        :'1' => 'symbolizable one',
+        1 => 'one',
+        [1, 2, 3] => 'testing',
+        { 'test' => 'value' } => 'value'
+      )
+    end
   end
 
   context 'implicit to_hash on double splat' do
diff --git a/spec/hashie/extensions/symbolize_keys_spec.rb b/spec/hashie/extensions/symbolize_keys_spec.rb
index be345ea..34ac8d8 100644
--- a/spec/hashie/extensions/symbolize_keys_spec.rb
+++ b/spec/hashie/extensions/symbolize_keys_spec.rb
@@ -89,9 +89,10 @@ describe Hashie::Extensions::SymbolizeKeys do
   context 'singleton methods' do
     subject { Hash }
     let(:object) do
-      subject.new.merge('a' => 1, 'b' => { 'c' => 2 }).extend(Hashie::Extensions::SymbolizeKeys)
+      subject.new.merge('a' => 1, 'b' => { 'c' => 2 }, 1 => 'numeric key')
+             .extend(Hashie::Extensions::SymbolizeKeys)
     end
-    let(:expected_hash) { { a: 1, b: { c: 2 } } }
+    let(:expected_hash) { { a: 1, b: { c: 2 }, 1 => 'numeric key' } }
 
     describe '.symbolize_keys' do
       it 'does not raise error' do