Tests for all platforms.

This test should generate 4 processed tests:

| MWLC | changes | checks |

This test should generate 1 processed tests:

| MWLC | changes(Dog) | check_b(Dog, Red) |

Tests only for ChromeOS

| C | state_change_a | state_change_b(Chicken, Red) | check_a | | C | state_change_a(Dog) | state_change_a(Chicken) | check_b(Chicken, Green) |

This test should generate 2 processed tests:

| MWLC | changes(Dog) | check_a(Animal::All) |