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defmodule ElixirMathParserTest do
use ExUnit.Case
import ElixirMathParser, only: [parse_and_eval: 1]
doctest ElixirMathParser
test "assignment" do
assert parse_and_eval(":a = 1") == %{a: 1}
end
test "add" do
assert parse_and_eval(":a = 3 + 2") == %{a: 5}
end
test "sub" do
assert parse_and_eval(":a = 3 - 2") == %{a: 1}
end
test "mul" do
assert parse_and_eval(":a = 3 * 2") == %{a: 6}
end
test "div" do
assert parse_and_eval(":a = 6 / 2") == %{a: 3}
end
test "operator precedence for mul" do
assert parse_and_eval(":a = 3 * 2 + 1") == %{a: 7}
assert parse_and_eval(":a = 3 * 2 - 1") == %{a: 5}
assert parse_and_eval(":a = 1 + 3 * 2") == %{a: 7}
assert parse_and_eval(":a = 1 - 3 * 2") == %{a: -5}
end
test "operator precedence for div" do
assert parse_and_eval(":a = 6 / 2 + 1") == %{a: 4}
assert parse_and_eval(":a = 6 / 2 - 1") == %{a: 2}
assert parse_and_eval(":a = 1 + 6 / 2") == %{a: 4}
assert parse_and_eval(":a = 1 - 6 / 2") == %{a: -2}
end
test "variable reference" do
assert parse_and_eval("""
:a = 3
:b = 2
:result = :a + :b
""") == %{a: 3, b: 2, result: 5}
end
test "variable update" do
assert parse_and_eval("""
:a = 3
:b = 2
:a = :a + :b
""") == %{a: 5, b: 2}
end
test "variables with numbers in name" do
assert parse_and_eval("""
:a1 = 3
:a2 = 2
:b1 = :a1 + :a2
""") == %{a1: 3, a2: 2, b1: 5}
end
end
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