ruby - collatz-conjecture

ruby/collatz-conjecture/collatz_conjecture_test.rb

@@ -0,0 +1,39 @@
+require 'minitest/autorun'
+require_relative 'collatz_conjecture'
+
+# Common test data version: 1.2.1 d94e348
+class CollatzConjectureTest < Minitest::Test
+  def test_zero_steps_for_one
+    # skip
+    assert_equal 0, CollatzConjecture.steps(1)
+  end
+
+  def test_divide_if_even
+    # skip
+    assert_equal 4, CollatzConjecture.steps(16)
+  end
+
+  def test_even_and_odd_steps
+    # skip
+    assert_equal 9, CollatzConjecture.steps(12)
+  end
+
+  def test_large_number_of_even_and_odd_steps
+    # skip
+    assert_equal 152, CollatzConjecture.steps(1_000_000)
+  end
+
+  def test_zero_is_an_error
+    # skip
+    assert_raises(ArgumentError) do
+      CollatzConjecture.steps(0)
+    end
+  end
+
+  def test_negative_value_is_an_error
+    # skip
+    assert_raises(ArgumentError) do
+      CollatzConjecture.steps(-15)
+    end
+  end
+end