armstrong_number

elixir/armstrong-numbers/test/armstrong_number_test.exs

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+defmodule ArmstrongNumberTest do
+  use ExUnit.Case
+
+  test "Zero is an Armstrong number" do
+    assert ArmstrongNumber.valid?(0)
+  end
+
+  test "Single digit numbers are Armstrong numbers" do
+    assert ArmstrongNumber.valid?(5)
+  end
+
+  test "There are no two-digit Armstrong Numbers" do
+    refute ArmstrongNumber.valid?(10)
+  end
+
+  test "Three-digit number that is an Armstrong number" do
+    assert ArmstrongNumber.valid?(153)
+  end
+
+  test "Three-digit number that is not an Armstrong number" do
+    refute ArmstrongNumber.valid?(100)
+  end
+
+  test "Four-digit number that is an Armstrong number" do
+    assert ArmstrongNumber.valid?(9474)
+  end
+
+  test "Four-digit number that is not an Armstrong number" do
+    refute ArmstrongNumber.valid?(9475)
+  end
+
+  test "Seven-digit number that is an Armstrong number" do
+    assert ArmstrongNumber.valid?(9_926_315)
+  end
+
+  test "Seven-digit number that is not an Armstrong number" do
+    refute ArmstrongNumber.valid?(9_926_134)
+  end
+
+  test "Armstrong number containing seven zeroes" do
+    assert ArmstrongNumber.valid?(186_709_961_001_538_790_100_634_132_976_990)
+  end
+
+  test "The largest and last Armstrong number" do
+    assert ArmstrongNumber.valid?(115_132_219_018_763_992_565_095_597_973_971_522_401)
+  end
+end

elixir/armstrong-numbers/test/test_helper.exs

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