1 files changed, 39 insertions, 0 deletions
diff --git a/spec/hashie/extensions/mash/symbolize_keys_spec.rb b/spec/hashie/extensions/mash/symbolize_keys_spec.rb
new file mode 100644
index 0000000..1e52534
--- /dev/null
+++ b/spec/hashie/extensions/mash/symbolize_keys_spec.rb
@@ -0,0 +1,39 @@
+require 'spec_helper'
+
+RSpec.describe Hashie::Extensions::Mash::SymbolizeKeys do
+  it 'raises an error when included in a class that is not a Mash' do
+    expect do
+      Class.new do
+        include Hashie::Extensions::Mash::SymbolizeKeys
+      end
+    end.to raise_error(ArgumentError)
+  end
+
+  it 'symbolizes all keys in the Mash' do
+    my_mash = Class.new(Hashie::Mash) do
+      include Hashie::Extensions::Mash::SymbolizeKeys
+    end
+
+    expect(my_mash.new('test' => 'value').to_h).to eq(test: 'value')
+  end
+
+  context 'implicit to_hash on double splat' do
+    let(:destructure) { ->(**opts) { opts } }
+    let(:my_mash) do
+      Class.new(Hashie::Mash) do
+        include Hashie::Extensions::Mash::SymbolizeKeys
+      end
+    end
+    let(:instance) { my_mash.new('outer' => { 'inner' => 42 }, 'testing' => [1, 2, 3]) }
+
+    subject { destructure.call(instance) }
+
+    it 'is converted on method calls' do
+      expect(subject).to eq(outer: { inner: 42 }, testing: [1, 2, 3])
+    end
+
+    it 'is converted on explicit operator call' do
+      expect(**instance).to eq(outer: { inner: 42 }, testing: [1, 2, 3])
+    end
+  end
+end