Fix duplicate test class names in sorting tests

sorting/bead_sort_test.rb

@@ -2,7 +2,7 @@
 require_relative './sort_tests'
 require_relative './bead_sort'
 
-class TestInsertionSort < Minitest::Test
+class TestBeadSort < Minitest::Test
   include SortTests
 
   def sort(input)

sorting/cocktail_sort_test.rb

@@ -2,7 +2,7 @@
 require_relative './sort_tests'
 require_relative './cocktail_sort'
 
-class TestInsertionSort < Minitest::Test
+class TestCocktailSort < Minitest::Test
   include SortTests
 
   def sort(input)

sorting/comb_sort_test.rb

@@ -2,7 +2,7 @@
 require_relative './sort_tests'
 require_relative './comb_sort'
 
-class TestInsertionSort < Minitest::Test
+class TestCombSort < Minitest::Test
   include SortTests
 
   def sort(input)

sorting/pancake_sort_test.rb

@@ -2,7 +2,7 @@
 require_relative './sort_tests'
 require_relative './pancake_sort'
 
-class TestInsertionSort < Minitest::Test
+class TestPancakeSort < Minitest::Test
   include SortTests
 
   def sort(input)