сollatz-сonjecture

elixir/collatz-conjecture/test/collatz_conjecture_test.exs

@@ -0,0 +1,39 @@
+defmodule CollatzConjectureTest do
+  use ExUnit.Case
+
+  test "zero steps for one" do
+    assert CollatzConjecture.calc(1) == 0
+  end
+
+  test "zero is an error" do
+    assert_raise FunctionClauseError, fn -> CollatzConjecture.calc(0) end
+  end
+
+  test "divide if even" do
+    assert CollatzConjecture.calc(16) == 4
+  end
+
+  test "even and odd steps" do
+    assert CollatzConjecture.calc(12) == 9
+  end
+
+  test "Large number of even and odd steps" do
+    assert CollatzConjecture.calc(1_000_000) == 152
+  end
+
+  test "start with odd step" do
+    assert CollatzConjecture.calc(21) == 7
+  end
+
+  test "more steps than starting number" do
+    assert CollatzConjecture.calc(7) == 16
+  end
+
+  test "negative value is an error " do
+    assert_raise FunctionClauseError, fn -> CollatzConjecture.calc(-15) end
+  end
+
+  test "string as input value is an error " do
+    assert_raise FunctionClauseError, fn -> CollatzConjecture.calc("fubar") end
+  end
+end

elixir/collatz-conjecture/test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)