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