difference-of-squares

elixir/difference-of-squares/test/squares_test.exs

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+defmodule SquaresTest do
+  use ExUnit.Case
+
+  describe "square_of_sum" do
+    test "square of sum to 1" do
+      assert Squares.square_of_sum(1) == 1
+    end
+
+    test "square of sum to 5" do
+      assert Squares.square_of_sum(5) == 225
+    end
+
+    test "square of sum to 100" do
+      assert Squares.square_of_sum(100) == 25_502_500
+    end
+  end
+
+  describe "sum_of_squares" do
+    test "sum of squares to 1" do
+      assert Squares.sum_of_squares(1) == 1
+    end
+
+    test "sum of squares to 5" do
+      assert Squares.sum_of_squares(5) == 55
+    end
+
+    test "sum of squares to 100" do
+      assert Squares.sum_of_squares(100) == 338_350
+    end
+  end
+
+  describe "difference" do
+    test "difference of sum to 1" do
+      assert Squares.difference(1) == 0
+    end
+
+    test "difference of sum to 5" do
+      assert Squares.difference(5) == 170
+    end
+
+    test "difference of sum to 100" do
+      assert Squares.difference(100) == 25_164_150
+    end
+  end
+end

elixir/difference-of-squares/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)