diff --git a/exercises/practice/acronym/.meta/test_template.erb b/exercises/practice/acronym/.meta/test_template.erb
index c2b235f152..4f81d4ab61 100644
--- a/exercises/practice/acronym/.meta/test_template.erb
+++ b/exercises/practice/acronym/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'acronym'
 class AcronymTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         assert_equal '<%= cases["expected"] %>', <%= camel_case(json["exercise"]) %>.<%= underscore(cases["property"]) %>('<%= cases["input"]["phrase"].gsub("'", "\\\\'") %>')
     end
 <% end %>
diff --git a/exercises/practice/affine-cipher/.meta/test_template.erb b/exercises/practice/affine-cipher/.meta/test_template.erb
index 0a62fdb4e3..d74596fcb3 100644
--- a/exercises/practice/affine-cipher/.meta/test_template.erb
+++ b/exercises/practice/affine-cipher/.meta/test_template.erb
@@ -5,7 +5,7 @@ class AffineCipherTest < Minitest::Test
 <% json["cases"].each do |group| %>
     <% group["cases"].each do |sub_case| %>
         def test_<%= underscore(sub_case["description"]) %>
-            <%= skip? %> 
+            <%= skip? %>
             <%- if sub_case["expected"].is_a?(Hash) && sub_case["expected"].key?("error") -%>
                 assert_raises(ArgumentError) { Affine.new(<%= sub_case["input"]["key"]["a"] %>, <%= sub_case["input"]["key"]["b"] %>) }
             <%- else -%>
diff --git a/exercises/practice/all-your-base/.meta/test_template.erb b/exercises/practice/all-your-base/.meta/test_template.erb
index b1260006f0..abca6b0c51 100644
--- a/exercises/practice/all-your-base/.meta/test_template.erb
+++ b/exercises/practice/all-your-base/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'all_your_base'
 class AllYourBaseTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         digits = <%= cases["input"]["digits"] %>
         input_base = <%= cases["input"]["inputBase"] %>
         output_base = <%= cases["input"]["outputBase"] %>
diff --git a/exercises/practice/allergies/.meta/test_template.erb b/exercises/practice/allergies/.meta/test_template.erb
index 70ddced656..cfd460a705 100644
--- a/exercises/practice/allergies/.meta/test_template.erb
+++ b/exercises/practice/allergies/.meta/test_template.erb
@@ -5,7 +5,7 @@ class AllergiesTest < Minitest::Test
 <% json["cases"].each do |group| %>
     <% group["cases"].each do |sub_case| %>
     def test_<%= underscore(group["description"]) %>_<%= underscore(sub_case["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         allergies = Allergies.new(<%= sub_case["input"]["score"] %>)
         <%- if sub_case["property"] == "allergicTo" -%>
         <%= sub_case["expected"] ? "assert" : "refute" %> allergies.allergic_to?('<%= sub_case["input"]["item"] %>'), 'Tom is<%= sub_case["expected"] ? "" : " not" %> allergic, but it says he is<%= sub_case["expected"] ? " not" : "" %>.'
diff --git a/exercises/practice/anagram/.meta/test_template.erb b/exercises/practice/anagram/.meta/test_template.erb
index 003e246495..e30bc6a64b 100644
--- a/exercises/practice/anagram/.meta/test_template.erb
+++ b/exercises/practice/anagram/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'anagram'
 class AnagramTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         detector = Anagram.new('<%= cases["input"]["subject"] %>')
         anagrams = detector.match(%w[<%= cases["input"]["candidates"].join(" ") %>])
         expected = %w[<%= cases["expected"].join(" ") %>]
diff --git a/exercises/practice/armstrong-numbers/.meta/test_template.erb b/exercises/practice/armstrong-numbers/.meta/test_template.erb
index a39a63b2a7..1a6dfe3297 100644
--- a/exercises/practice/armstrong-numbers/.meta/test_template.erb
+++ b/exercises/practice/armstrong-numbers/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'armstrong_numbers'
 class ArmstrongNumbersTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         <%= cases["expected"] ? "assert_includes" : "refute_includes" %> ArmstrongNumbers, <%= cases["input"]["number"] %>
     end
     <% end %>
diff --git a/exercises/practice/binary-search/.meta/test_template.erb b/exercises/practice/binary-search/.meta/test_template.erb
index 27b55b5a33..5a610120ea 100644
--- a/exercises/practice/binary-search/.meta/test_template.erb
+++ b/exercises/practice/binary-search/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'binary_search'
 class BinarySearchTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         binary = BinarySearch.new(<%= cases["input"]["array"] %>)
         <%- if cases["expected"].is_a?(Hash) && cases["expected"].key?("error") -%>
         assert_nil binary.search_for(<%= cases["input"]["value"] %>)
diff --git a/exercises/practice/bob/.meta/test_template.erb b/exercises/practice/bob/.meta/test_template.erb
index 521fa04e84..e6b3f4d67f 100644
--- a/exercises/practice/bob/.meta/test_template.erb
+++ b/exercises/practice/bob/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'bob'
 class BobTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         remark = <%= cases["input"]["heyBob"].dump()  %>
         assert_equal "<%= cases["expected"] %>", Bob.hey(remark), <%= "Bob hears #{ cases["input"]["heyBob"].dump}, and..".dump %>
     end
diff --git a/exercises/practice/book-store/.meta/test_template.erb b/exercises/practice/book-store/.meta/test_template.erb
index 3466cd8163..7e08221631 100644
--- a/exercises/practice/book-store/.meta/test_template.erb
+++ b/exercises/practice/book-store/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'book_store'
 class BookStoreTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         basket = <%= cases["input"]["basket"] %>
         assert_in_delta <%= cases["expected"] / 100.0 %>0, BookStore.calculate_price(basket), 0.001
     end
diff --git a/exercises/practice/bottle-song/.meta/example.rb b/exercises/practice/bottle-song/.meta/example.rb
index a318fc81ef..1325dfe2f9 100644
--- a/exercises/practice/bottle-song/.meta/example.rb
+++ b/exercises/practice/bottle-song/.meta/example.rb
@@ -1,7 +1,7 @@
 module BottleSong
 
   TRANSLATE = {
-    0 => "no", 1 => "one", 2 => "two", 3 => "three", 4 => "four", 5 => "five", 
+    0 => "no", 1 => "one", 2 => "two", 3 => "three", 4 => "four", 5 => "five",
     6 => "six", 7 => "seven", 8 => "eight", 9 => "nine", 10 => "ten"
   }
 
diff --git a/exercises/practice/bowling/.meta/test_template.erb b/exercises/practice/bowling/.meta/test_template.erb
index 1f60bac68d..1e384324fb 100644
--- a/exercises/practice/bowling/.meta/test_template.erb
+++ b/exercises/practice/bowling/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'bowling'
 class BowlingTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         game = Game.new
         rolls = <%= cases["input"]["previousRolls"] %>
         rolls.each { |pins| game.roll(pins) }
diff --git a/exercises/practice/change/.meta/test_template.erb b/exercises/practice/change/.meta/test_template.erb
index d78da98584..7a8e944ec5 100644
--- a/exercises/practice/change/.meta/test_template.erb
+++ b/exercises/practice/change/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'change'
 class ChangeTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         <%- if cases["expected"].is_a?(Hash) && cases["expected"].key?("error") -%>
             <%- if cases["expected"]["error"] == "can't make target with given coins" -%>
                 assert_raises(Change::ImpossibleCombinationError) do
diff --git a/exercises/practice/clock/.meta/test_template.erb b/exercises/practice/clock/.meta/test_template.erb
index 73a9a4f615..62bfc38ffa 100644
--- a/exercises/practice/clock/.meta/test_template.erb
+++ b/exercises/practice/clock/.meta/test_template.erb
@@ -5,7 +5,7 @@ class ClockTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     <% cases["cases"].each do |sub_case| %>
         def test_<%= underscore(sub_case["description"]) %>
-            <%= skip? %> 
+            <%= skip? %>
             <%- if sub_case["property"] == "create" -%>
                 assert_equal '<%= sub_case["expected"] %>', Clock.new(<%= sub_case["input"]["hour"] != 0 ? "hour: #{sub_case["input"]["hour"]}" : "" %><%= sub_case["input"]["minute"] != 0 && sub_case["input"]["hour"] != 0 ? ", " : "" %><%= sub_case["input"]["minute"] != 0 ?  "minute: #{sub_case["input"]["minute"]}" : "" %>).to_s
             <%- elsif sub_case["property"] == "add" -%>
diff --git a/exercises/practice/collatz-conjecture/.meta/test_template.erb b/exercises/practice/collatz-conjecture/.meta/test_template.erb
index 3ddb2ed329..6568e7eb1f 100644
--- a/exercises/practice/collatz-conjecture/.meta/test_template.erb
+++ b/exercises/practice/collatz-conjecture/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'collatz_conjecture'
 class CollatzConjectureTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         <%- if cases["expected"].is_a?(Hash) && cases["expected"].key?("error") -%>
         assert_raises(ArgumentError) do
             CollatzConjecture.steps(<%= cases["input"]["number"] %>)
diff --git a/exercises/practice/dominoes/.meta/test_template.erb b/exercises/practice/dominoes/.meta/test_template.erb
index a7e57e72db..91503162f3 100644
--- a/exercises/practice/dominoes/.meta/test_template.erb
+++ b/exercises/practice/dominoes/.meta/test_template.erb
@@ -4,7 +4,7 @@ require_relative 'dominoes'
 class DominoesTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         dominoes = <%= cases["input"]["dominoes"] %>
         <%= cases["expected"] ? "assert" : "refute" %> Dominoes.chain?(dominoes)
     end
diff --git a/exercises/practice/grains/.meta/test_template.erb b/exercises/practice/grains/.meta/test_template.erb
index ffb764c893..0c6480dfb7 100644
--- a/exercises/practice/grains/.meta/test_template.erb
+++ b/exercises/practice/grains/.meta/test_template.erb
@@ -18,7 +18,7 @@ class GrainsTest < Minitest::Test
         <% end %>
     <%- else -%>
         def test_<%= underscore(cases["description"]) %>
-        <%= skip? %> 
+        <%= skip? %>
         assert_equal <%= cases["expected"] %>, Grains.total
         end
     <%- end -%>
diff --git a/exercises/practice/hamming/RUNNING_TESTS.md b/exercises/practice/hamming/RUNNING_TESTS.md
index b92def24b9..d0585748e0 100644
--- a/exercises/practice/hamming/RUNNING_TESTS.md
+++ b/exercises/practice/hamming/RUNNING_TESTS.md
@@ -34,7 +34,7 @@ in random order as well.
 
 The goal is to have all passing tests, which will show in two places:
 
-1. `SSSSSSESSSSSSSSS` will become a series dots: `................`, 
+1. `SSSSSSESSSSSSSSS` will become a series dots: `................`,
 
 2. The line at the bottom will read `16 runs, 16 assertions, 0 failures, 0
    errors, 0 skips`.
diff --git a/exercises/practice/house/.meta/test_template.erb b/exercises/practice/house/.meta/test_template.erb
index 9856c8c29f..9814b3d531 100644
--- a/exercises/practice/house/.meta/test_template.erb
+++ b/exercises/practice/house/.meta/test_template.erb
@@ -5,7 +5,7 @@ class HouseTest < Minitest::Test
 <% json["cases"].each do |cases| %>
     def test_<%= underscore(cases["description"]) %>
         <%= skip? %>
-        expected = <<~RHYME 
+        expected = <<~RHYME
 <%= cases["expected"].join("\n") %>
         RHYME
         assert_equal expected, House.recite(<%= cases["input"]["startVerse"] %>, <%= cases["input"]["endVerse"] %>)
diff --git a/exercises/practice/perfect-numbers/.meta/test_template.erb b/exercises/practice/perfect-numbers/.meta/test_template.erb
index 0ce19306cf..7d8be9a4c7 100644
--- a/exercises/practice/perfect-numbers/.meta/test_template.erb
+++ b/exercises/practice/perfect-numbers/.meta/test_template.erb
@@ -5,7 +5,7 @@ class PerfectNumberTest < Minitest::Test
 <% json["cases"].each do |group| %>
   <% group["cases"].each do |sub_case| %>
     def test_<%= underscore(sub_case["description"]) %>
-      <%= skip? %> 
+      <%= skip? %>
       <%- if sub_case["expected"].is_a?(Hash) && sub_case["expected"].key?("error") -%>
         error = assert_raises(ArgumentError) { PerfectNumber.<%= underscore(sub_case["property"]) %>(<%= sub_case["input"]["number"] %>) }
         assert_equal '<%= sub_case["expected"]["error"] %>', error.message
diff --git a/exercises/practice/proverb/.meta/additional_tests.json b/exercises/practice/proverb/.meta/additional_tests.json
index e44afbc2cd..227e7e797b 100644
--- a/exercises/practice/proverb/.meta/additional_tests.json
+++ b/exercises/practice/proverb/.meta/additional_tests.json
@@ -1,4 +1,4 @@
-{ "cases": 
+{ "cases":
     [
         {
         "uuid": "4d420abc-5359-4a6c-b6a8-05edcd9463c9",
diff --git a/exercises/practice/proverb/.meta/test_template.erb b/exercises/practice/proverb/.meta/test_template.erb
index 481a33aa08..6c032b999e 100644
--- a/exercises/practice/proverb/.meta/test_template.erb
+++ b/exercises/practice/proverb/.meta/test_template.erb
@@ -10,7 +10,7 @@ class ProverbTest < Minitest::Test
       <%- if cases["property"] == "consistency" %>
         actual = proverb.to_s
         expected = proverb.to_s
-        assert_equal expected, actual 
+        assert_equal expected, actual
       <%- else -%>
         actual = proverb.to_s
         expected = "<%= cases["expected"].join("\\n\" \\\n\t\t\t\"") %>"
diff --git a/exercises/practice/roman-numerals/.meta/example.rb b/exercises/practice/roman-numerals/.meta/example.rb
index 676c41c5cd..4971b2091a 100644
--- a/exercises/practice/roman-numerals/.meta/example.rb
+++ b/exercises/practice/roman-numerals/.meta/example.rb
@@ -1,6 +1,6 @@
 class Integer
-  ROMAN_MAPPINGS = 
-   {
+  ROMAN_MAPPINGS =
+    {
       1000 => 'M',
       900 => 'CM',
       500 => 'D',