WIP: Enhance tests

[stellasia]

Definition of tests to be added: (Work in progress)

• [ ] Update layer name (done in https://github.com/stellasia/neomap/blob/master/src/components/Layer.test.js#L48)
• [ ] Add new lat/lon layer
• [ ] Update latitude property, Update longitude property
• [ ] Add new point layer
• [ ] Add new spatial layer
• [ ] Spatial layer enabled only if neo4j spatial is installed
• [ ] Add new cypher layer
• [ ] Change layer type from lat/lon to cypher
• [ ] Change layer type from point to cypher
• [ ] Change layer type from spatial to cypher
• [ ] Change layer type from cypher to any
• [ ] Change layer rendering
• [ ] ?