leap

elixir/leap/test/test_helper.exs

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

elixir/leap/test/year_test.exs

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+defmodule YearTest do
+  use ExUnit.Case
+
+  # @tag :pending
+  test "year not divisible by 4 is common year" do
+    refute Year.leap_year?(2015)
+  end
+
+  # @tag :pending
+  test "year divisible by 2, not divisible by 4 is common year" do
+    refute Year.leap_year?(1970)
+  end
+
+  # @tag :pending
+  test "year divisible by 4, not divisible by 100 is leap year" do
+    assert Year.leap_year?(1996)
+  end
+
+  # @tag :pending
+  test "year divisible by 4 and 5 is still a leap year" do
+    assert Year.leap_year?(1960)
+  end
+
+  @tag :pending
+  test "year divisible by 100, not divisible by 400 is common year" do
+    refute Year.leap_year?(2100)
+  end
+
+  # @tag :pending
+  test "year divisible by 100 but not by 3 is still not a leap year" do
+    refute Year.leap_year?(1900)
+  end
+
+  # @tag :pending
+  test "year divisible by 400 is leap year" do
+    assert Year.leap_year?(2000)
+  end
+
+  # @tag :pending
+  test "year divisible by 400 but not by 125 is still a leap year" do
+    assert Year.leap_year?(2400)
+  end
+
+  # @tag :pending
+  test "year divisible by 200, not divisible by 400 in common year" do
+    refute Year.leap_year?(1800)
+  end
+end