iD/test/spec/actions/straighten.js

describe('iD.actions.Straighten', function () {
    var projection = d3.geo.mercator();

    describe('#disabled', function () {
        it('returns falsy for ways with internal nodes near centerline', function () {
            var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [1, 0.1]}),
                iD.Node({id: 'c', loc: [2, 0]}),
                iD.Node({id: 'd', loc: [3, 0]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c', 'd']})
            ]);

            expect(iD.actions.Straighten('-', projection).disabled(graph)).not.to.be.ok;
        });

        it('returns \'too_bendy\' for ways with internal nodes far off centerline', function () {
            var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [1, 1]}),
                iD.Node({id: 'c', loc: [2, 0]}),
                iD.Node({id: 'd', loc: [3, 0]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c', 'd']})
            ]);

            expect(iD.actions.Straighten('-', projection).disabled(graph)).to.equal('too_bendy');
        });

        it('returns \'too_bendy\' for ways with coincident start/end nodes', function () {
            var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [1, 0]}),
                iD.Node({id: 'c', loc: [2, 0]}),
                iD.Node({id: 'd', loc: [0, 0]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c', 'd']})
            ]);

            expect(iD.actions.Straighten('-', projection).disabled(graph)).to.equal('too_bendy');
        });
    });

    it('deletes empty nodes', function() {
        var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [2, 0], tags: {}}),
                iD.Node({id: 'c', loc: [2, 2]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c']})
            ]);

        graph = iD.actions.Straighten('-', projection)(graph);

        expect(graph.hasEntity('b')).to.eq(undefined);
    });

    it('does not delete tagged nodes', function() {
       var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [2, 0], tags: {foo: 'bar'}}),
                iD.Node({id: 'c', loc: [2, 2]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c']})
            ]);

        graph = iD.actions.Straighten('-', projection)(graph);

        expect(graph.entity('-').nodes).to.eql(['a', 'b', 'c']);
    });

    it('does not delete nodes connected to other ways', function() {
        var graph = iD.Graph([
                iD.Node({id: 'a', loc: [0, 0]}),
                iD.Node({id: 'b', loc: [2, 0]}),
                iD.Node({id: 'c', loc: [2, 2]}),
                iD.Node({id: 'd', loc: [0, 2]}),
                iD.Way({id: '-', nodes: ['a', 'b', 'c', 'd']}),
                iD.Way({id: '=', nodes: ['b']})
            ]);

        graph = iD.actions.Straighten('-', projection)(graph);

        expect(graph.entity('-').nodes).to.have.length(3);
    });
});