diff --git a/lib/gold_miner/helpers.rb b/lib/gold_miner/helpers.rb
index 80f13f7..219299a 100644
--- a/lib/gold_miner/helpers.rb
+++ b/lib/gold_miner/helpers.rb
@@ -6,12 +6,7 @@ def self.pretty_date(date)
       end
 
       def self.last_friday
-        date = Date.today
-        one_day_ago = (date - 1)
-        one_week_ago = date - 7
-        friday = one_day_ago.downto(one_week_ago).find { |date| date.friday? }
-
-        friday.to_s
+        Enumerator.produce(Date.today - 1, &:prev_day).find { |date| date.friday? }.to_s
       end
     end
 
diff --git a/spec/gold_miner/helpers_spec.rb b/spec/gold_miner/helpers_spec.rb
index ae04987..55c5daa 100644
--- a/spec/gold_miner/helpers_spec.rb
+++ b/spec/gold_miner/helpers_spec.rb
@@ -3,6 +3,34 @@
 require "spec_helper"
 
 RSpec.describe GoldMiner::Helpers do
+  describe GoldMiner::Helpers::Time do
+    describe ".last_friday" do
+      it "returns the last Friday when today is Saturday" do
+        travel_to Date.new(2024, 7, 13) do
+          result = described_class.last_friday
+
+          expect(result).to eq("2024-07-12")
+        end
+      end
+
+      it "returns the last Friday when today is Friday" do
+        travel_to Date.new(2024, 7, 12) do
+          result = described_class.last_friday
+
+          expect(result).to eq("2024-07-05")
+        end
+      end
+
+      it "returns the last Friday when today is Thursday" do
+        travel_to Date.new(2024, 7, 11) do
+          result = described_class.last_friday
+
+          expect(result).to eq("2024-07-05")
+        end
+      end
+    end
+  end
+
   describe GoldMiner::Helpers::Sentence do
     describe ".from" do
       it "returns a sentence from a list of words" do