### Question:
Proj { public static CoordinateReferenceSystem crs(int srid) { return crs("EPSG:"+srid); }  static CoordinateReferenceSystem crs(int srid); static CoordinateReferenceSystem crs(String s); static CoordinateReferenceSystem crs(String... projdef); static CoordinateReferenceSystem crs(Geometry geom); static Geometry crs(Geometry g, CoordinateReferenceSystem crs); static Geometry crs(Geometry g, CoordinateReferenceSystem crs, boolean overwrite); static Integer epsgCode(CoordinateReferenceSystem crs); static Bounds bounds(CoordinateReferenceSystem crs); static T reproject(T g, String from, String to); static T reproject(T g, CoordinateReferenceSystem from, 
        CoordinateReferenceSystem to); static T transform(T g, CoordinateTransform tx); static T transform(T g, CoordinateTransform tx, boolean inPlace); static Bounds reproject(Envelope e, String from, String to); static Bounds reproject(Envelope e, CoordinateReferenceSystem from,
        CoordinateReferenceSystem to); static CoordinateTransform transform(CoordinateReferenceSystem from, 
        CoordinateReferenceSystem to); static String toString(CoordinateReferenceSystem crs); static CoordinateReferenceSystem fromWKT(String wkt); static String toWKT(CoordinateReferenceSystem crs, boolean format); static boolean equal(CoordinateReferenceSystem crs1, CoordinateReferenceSystem crs2); static final CoordinateReferenceSystem EPSG_4326; static final CoordinateReferenceSystem EPSG_900913; }### Answer:
@Test public void testCrs() { CoordinateReferenceSystem crs = Proj.crs("EPSG:4326"); assertNotNull(crs); crs = Proj.crs("+proj=longlat +datum=WGS84 +no_defs"); assertNotNull(crs); crs = Proj.crs("+proj=longlat", "+datum=WGS84", "+no_defs"); assertNotNull(crs); }
@Test public void test900913() { assertNotNull(Proj.crs("epsg:900913")); }
@Test public void testEncodeWKT() throws Exception { CoordinateReferenceSystem crs = Proj.crs("epsg:4326"); }