diff --git a/max_by_spec.rb b/max_by_spec.rb
new file mode 100644
index 0000000..707a2fd
--- /dev/null
+++ b/max_by_spec.rb
@@ -0,0 +1,20 @@
+
+describe 'max_by' do
+
+  sweet_stuff = ['cheesecake', 'lemon cake', 'almond tarte', 'blondies']
+
+  it 'returns an Enumerator when no block is given' do
+    expect(sweet_stuff.max_by).to be_an Enumerator
+  end
+
+  it 'returns the maximum value from the given block' do
+    expect(sweet_stuff.max_by { |nom| nom }).to eq 'lemon cake'
+    expect(sweet_stuff.max_by { |nom| nom.length }).to eq 'almond tarte'
+  end
+
+  it 'takes an optional argument that determines how many values are returned ' do
+    # expect(sweet_stuff.max_by(2) { |nom| nom }).to eq ['lemon cake', 'cheesecake']
+    expect(sweet_stuff.sort.reverse.first(2)).to eq ['lemon cake', 'cheesecake']
+  end
+
+end