49 lines
1.1 KiB
Elixir
49 lines
1.1 KiB
Elixir
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defmodule ExpressionEvaluatorTest do
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use ExUnit.Case
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doctest ExpressionEvaluator
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import ExpressionEvaluator
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test "evaluates individual numbers" do
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assert eval("1") == 1
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end
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test "evaluates negated numbers" do
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assert eval("-1") == -1
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end
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test "evaluates variables" do
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assert eval("x", %{"x" => 3}) == 3
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end
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test "evaluates negated variables" do
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assert eval("-x", %{"x" => 3}) == -3
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assert eval("-x", %{"x" => -3}) == 3
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end
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test "evaluates binary operations" do
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assert eval("1 + 2") == 3
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assert eval("3 - 2") == 1
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assert eval("3 * 2") == 6
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assert eval("10 / 2") == 5
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end
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test "floors division" do
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assert eval("3 / 2") == 1
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end
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test "obeys operator precedence" do
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assert eval("1 + 2 * 3") == 7
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assert eval("(1 + 2) * 3") == 9
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assert eval("12 - 6 / 2") == 9
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assert eval("(12 - 6) / 2") == 3
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end
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test "evaluates complex expressions" do
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assert eval("1 + 2 * (3 - ((4 / 2 + 5) * 6))") == -77
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end
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test "evaluates complex expressions with variables" do
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assert eval("x * ((4 - y) / 6 + z))", %{"x" => 2, "y" => -8, "z" => 5}) == 14
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end
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end
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