private static void AssertCanJoin(IPolyline line1, IPolyline line2)
{
var path1 = (IPath)((IGeometryCollection)line1).get_Geometry(0);
double totalLength = path1.Length + line2.Length;
IPolyline resultPolyline = GeometryFactory.Clone(line2);
var resultPath = (IPath)((IGeometryCollection)resultPolyline).get_Geometry(0);
SegmentReplacementUtils.JoinConnectedPaths(path1, resultPath);
GeometryUtils.Simplify(resultPolyline, true, true);
Assert.AreEqual(totalLength, resultPath.Length);
Assert.AreEqual(1, ((IGeometryCollection)resultPolyline).GeometryCount);
}
