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u02/tests: Add average point test for star

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This commit is contained in:
Simon Bruder 2023-05-10 22:01:15 +02:00
parent 583f2ecd3e
commit d4794e1544
1 changed files with 22 additions and 1 deletions
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23
u02/src/tests.cpp
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@ -563,5 +563,26 @@ TEST_CASE("Star (prop: all points inside circle)") {
REQUIRE(pass);
}
// The Haskell implementation of regular_polygon_mod has many tests,
TEST_CASE("Star (prop: average of all points is centre)") {
const int x0 = GENERATE(take(5, random(-100, 100)));
const int y0 = GENERATE(take(5, random(-100, 100)));
const int n = GENERATE(take(5, random(3, 1000)));
const float r2 = GENERATE(take(5, random(0, 100)));
const float r_factor = GENERATE(take(5, random(0, 1)));
const float r1 = r_factor * r2;
const float angle = GENERATE(take(5, random(-16.0 * atan(1), 16 * atan(1))));
std::vector<std::pair<float, float>> points = star(n, r1, r2, x0, y0, angle);
float x = 0, y = 0;
for (std::pair<float, float> point : points) {
x += point.first;
y += point.second;
}
REQUIRE_THAT(x / points.size(), WithinRel(x0, 0.1));
REQUIRE_THAT(y / points.size(), WithinRel(y0, 0.1));
}
// The Haskell implementation of regular_polygon_mod has many more tests,
// but they are not implemented here for brevity.