The purpose of this repository is to have a common space in order to practice Springboot, Java and JUnit. Java version is 1.8

This package contains an Enum class, Colour, which contains rainbow colours. The purpose of Colour is to represent a basic list of values, indexes, i.e. with a default order.
In addition to this list, if we're given another random, dynamic list of values, we will show that we can render the basic list on top, ordered by index ascending, following by the random list, sorted by name and also assigning an index (idempotent, guaranteed to be the same every time for the same value, case insensitive).

E.g. for the list of rainbow colours: [RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET] with indexes: [0, ..., 6], if we're given the following list: [PURPLE, PINK, BLACK], then the final list will be:
[RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET, BLACK, PINK, PURPLE] with indexes: [0, ..., 7, 8, 9]

The last random colours are sorted by name in ascending order and given an increasing index, starting from the last index of the last rainbow colour. The next time another list is given, the non-rainbow colours will be re-arranged in ascending order, just like the aforementioned example.

This example can be a use case for a hardware store where we sell some popular paint colours and less popular ones or ones in high stock.

Another use case scenario can be applied on a medical website listing popular/basic diseases always on top with a fixed order always, while i.e. every month populating some other, less popular, diseases at the bottom of the page. For that, we would need to have a sorting mechanism (for us, it's enough to sort by name, but this can easily change, depending on the second parameter - comparing function - in the toSorted method).

Package colours contains:

• Colour class is the enum with basic methods for ordering by name or index.
• Utils class contains helper methods.
• ColourTest class has unit tests written in Junit5 using junit-jupiter-params library, for data driven tests (parameterized tests).