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tests: add unit tests for Math::CExpression (#13924)

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Ioannis Tzavaras 2026-03-31 18:37:49 +03:00 • committed by GitHub
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tests/helpers/Expression.cpp Normal file
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#include <helpers/math/Expression.hpp>
#include <gtest/gtest.h>
using namespace Math;
TEST(Helpers, expressionBasicArithmetic) {
CExpression expr;
EXPECT_DOUBLE_EQ(expr.compute("2 + 3").value(), 5.0);
EXPECT_DOUBLE_EQ(expr.compute("10 - 4").value(), 6.0);
EXPECT_DOUBLE_EQ(expr.compute("3 * 7").value(), 21.0);
EXPECT_DOUBLE_EQ(expr.compute("10 / 4").value(), 2.5);
}
TEST(Helpers, expressionOrderOfOperations) {
CExpression expr;
EXPECT_DOUBLE_EQ(expr.compute("2 + 3 * 4").value(), 14.0);
EXPECT_DOUBLE_EQ(expr.compute("(2 + 3) * 4").value(), 20.0);
EXPECT_DOUBLE_EQ(expr.compute("10 - 2 * 3").value(), 4.0);
EXPECT_DOUBLE_EQ(expr.compute("(10 - 2) * 3").value(), 24.0);
}
TEST(Helpers, expressionNegativeNumbers) {
CExpression expr;
EXPECT_DOUBLE_EQ(expr.compute("-5 + 3").value(), -2.0);
EXPECT_DOUBLE_EQ(expr.compute("-5 * -3").value(), 15.0);
EXPECT_DOUBLE_EQ(expr.compute("0 - 10").value(), -10.0);
}
TEST(Helpers, expressionFloatingPoint) {
CExpression expr;
EXPECT_DOUBLE_EQ(expr.compute("1.5 + 2.5").value(), 4.0);
EXPECT_DOUBLE_EQ(expr.compute("0.1 * 10").value(), 1.0);
EXPECT_NEAR(expr.compute("1 / 3").value(), 0.3333, 0.001);
}
TEST(Helpers, expressionWithVariables) {
CExpression expr;
expr.addVariable("x", 10);
EXPECT_DOUBLE_EQ(expr.compute("x * 2").value(), 20.0);
EXPECT_DOUBLE_EQ(expr.compute("x + 5").value(), 15.0);
EXPECT_DOUBLE_EQ(expr.compute("x * x").value(), 100.0);
}
TEST(Helpers, expressionMultipleVariables) {
CExpression expr;
expr.addVariable("w", 1920);
expr.addVariable("h", 1080);
EXPECT_DOUBLE_EQ(expr.compute("w / 2").value(), 960.0);
EXPECT_DOUBLE_EQ(expr.compute("w + h").value(), 3000.0);
EXPECT_DOUBLE_EQ(expr.compute("w * h").value(), 1920.0 * 1080.0);
}
TEST(Helpers, expressionInvalidInput) {
CExpression expr;
EXPECT_EQ(expr.compute(""), std::nullopt);
EXPECT_EQ(expr.compute("2 +"), std::nullopt);
EXPECT_EQ(expr.compute("abc"), std::nullopt);
EXPECT_EQ(expr.compute("* 5"), std::nullopt);
}
TEST(Helpers, expressionZero) {
CExpression expr;
EXPECT_DOUBLE_EQ(expr.compute("0").value(), 0.0);
EXPECT_DOUBLE_EQ(expr.compute("0 * 999").value(), 0.0);
EXPECT_DOUBLE_EQ(expr.compute("5 - 5").value(), 0.0);
}