rotaitional_chiper

elixir/rotational-cipher/test/rotational_cipher_test.exs

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+defmodule RotationalCipherTest do
+  use ExUnit.Case
+
+  test "rotate a by 1" do
+    plaintext = "a"
+    shift = 1
+    assert RotationalCipher.rotate(plaintext, shift) == "b"
+  end
+
+  test "rotate a by 26, same output as input" do
+    plaintext = "a"
+    shift = 26
+    assert RotationalCipher.rotate(plaintext, shift) == "a"
+  end
+
+  test "rotate a by 0, same output as input" do
+    plaintext = "a"
+    shift = 0
+    assert RotationalCipher.rotate(plaintext, shift) == "a"
+  end
+
+  test "rotate m by 13" do
+    plaintext = "m"
+    shift = 13
+    assert RotationalCipher.rotate(plaintext, shift) == "z"
+  end
+
+  test "rotate n by 13 with wrap around alphabet" do
+    plaintext = "n"
+    shift = 13
+    assert RotationalCipher.rotate(plaintext, shift) == "a"
+  end
+
+  test "rotate capital letters" do
+    plaintext = "OMG"
+    shift = 5
+    assert RotationalCipher.rotate(plaintext, shift) == "TRL"
+  end
+
+  test "rotate spaces" do
+    plaintext = "O M G"
+    shift = 5
+    assert RotationalCipher.rotate(plaintext, shift) == "T R L"
+  end
+
+  test "rotate numbers" do
+    plaintext = "Testing 1 2 3 testing"
+    shift = 4
+    assert RotationalCipher.rotate(plaintext, shift) == "Xiwxmrk 1 2 3 xiwxmrk"
+  end
+
+  test "rotate punctuation" do
+    plaintext = "Let's eat, Grandma!"
+    shift = 21
+    assert RotationalCipher.rotate(plaintext, shift) == "Gzo'n zvo, Bmviyhv!"
+  end
+
+  test "rotate all letters" do
+    plaintext = "The quick brown fox jumps over the lazy dog."
+    shift = 13
+
+    assert RotationalCipher.rotate(plaintext, shift) ==
+             "Gur dhvpx oebja sbk whzcf bire gur ynml qbt."
+  end
+end

elixir/rotational-cipher/test/test_helper.exs

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