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Add .toCoordinates() method to grid

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Calculates the 2-D array coordinates from the corresponding list index passed in. Relies on grid width to calculate coordinates. Does not check against grid size constraints.
This commit is contained in:
Marty Oehme 2018-08-30 09:52:00 +02:00
parent 6c3fcbe7b0
commit 5a72783d57
2 changed files with 32 additions and 2 deletions
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23
test/src/grid_test.dart
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@ -1,3 +1,5 @@
import 'dart:math';
import 'package:rules_of_living/src/Grid.dart';
import 'package:test/test.dart';
@ -115,4 +117,25 @@ void main() {
expect(sut.get(2, 2), "ready.");
}, tags: const ["happy"]);
});
group("toCoords", () {
Grid sut;
setUp(() {
sut = Grid(3, 3);
});
test("throws RangeError on negative index argument", () {
expect(() => sut.toCoordinates(-1), throwsA(isRangeError));
}, tags: const ["bad"]);
test("calculates correct index for first element", () {
expect(sut.toCoordinates(0), equals(Point(0, 0)));
}, tags: const ["happy"]);
test("calculates correct index for last element", () {
expect(sut.toCoordinates(8), equals(Point(2, 2)));
}, tags: const ["happy"]);
test("calculates correct index for last element on first row", () {
expect(sut.toCoordinates(2), equals(Point(2, 0)));
}, tags: const ["happy"]);
test("calculates correct index for example element", () {
expect(sut.toCoordinates(6), equals(Point(0, 2)));
}, tags: const ["happy"]);
});
}