#include "catch.hpp"

TEST_CASE("Initiering och storlek")
{
    SECTION("Empty")
    {
        CHECK_THROWS(Vektor(0));
    }
    SECTION("One element")
    {
        Vektor v;
        CHECK(v.size() == 1);
    }
    SECTION("N elements")
    {
        Vektor v(2);
        CHECK(v.size() == 2);
    }
    SECTION("initializer_list")
    {
        Vektor v{2,3,4,5,4.4};
        CHECK(v.size() == 5);
    }
}
TEST_CASE("Indexering")
{
    Vektor v{2,3,4.2};
    REQUIRE(v[0] == Approx(2.0));
    vector<double> vals {2,3,4.2};
    for ( size_t index{}; index < v.size(); ++index )
    {
        CHECK(v[index] == Approx(vals[index]));
    }
}

TEST_CASE("Addition")
{
    Vektor v{2.3, 4, 5.5};
    SECTION( "Vektor + skalär" )
    {
        Vektor v2{ v+2 };
        CHECK(v2[0] == Approx(4.3));
        CHECK(v2[2] == Approx(7.5));
    }
    SECTION( "skalär + Vektor" )
    {
        Vektor v2{ 2+v };
        CHECK(v2[0] == Approx(4.3));
        CHECK(v2[2] == Approx(7.5));
    }
    SECTION( "Vektor + Vektor")
    {
        Vektor v2 {4, 2.3, 6};
        Vektor summa { v + v2 };
        CHECK(summa[0] == Approx(6.3));
        CHECK(summa[1] == Approx(6.3));
        CHECK(summa[2] == Approx(11.5));
    }
    SECTION( "Vektor + Vektor (fel storlek)" )
    {
        Vektor v2 {2,3,5,6,8};
        CHECK_THROWS( v + v2 );
    }
}