Geometry.contains() function incorrect for linestring with same start and end coordinates

[ctytgat]

Consider the large geometry below (region of Flanders in Belgium). (EPSG:31370)

The following linestring
LINESTRING Z (154754.029 162698.619 103.086,154754.029 162698.619 101.426)
is contained in this region, but the geometry.contains() function says it's not.
Looks like it is caused by the the points being the same (the Z coordinate is not important)

To reproduce:

WKTReader wktReader = new WKTReader(new GeometryFactory(new PrecisionModel(), 31370));
Geometry geo = wktReader.read(<WKT below>);
Geometry geo2 = wktReader.read("LINESTRING Z (154754.029 162698.619 103.086,154754.029 162698.619 101.426)");
Geometry geo3 = wktReader.read("POINT Z (154754.029 162698.619 103.086)");
System.out.println(geo.contains(geo2));
System.out.println(geo.contains(geo3));

Will print

false
true

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[dr-jts]

This is because JTS currently treats zero-length LineStrings as invalid. Consequently the spatial predicates do not return the results that might be expected. (See also #345)

This is fixed in the forthcoming RelateNG implementation.