[foxy backport] Backport various commits for unit tests and coverage#1387

Merged

brawner merged 7 commits intobrawner/rclcpp-backport-tests-part1from

brawner/rclcpp-backport-tests-part2

Oct 7, 2020

Commits on Oct 7, 2020

EXPECT_THROW_EQ and ASSERT_THROW_EQ macros for unittests (#1232)
brawner
committed
Unittests for memory strategy files, except allocator_memory_strategy (#1189)
brawner
committed
fix node graph test with Connext and CycloneDDS returning actual data (#1245)

dirk-thomas
authored and
brawner
committed
fix failing test with Connext since it doesn't wait for discovery (#1246)

dirk-thomas
and
brawner
committed
Adjust test_static_executor_entities_collector for rmw_connext_cpp (#1251)
brawner
committed
Increase timeouts for connext for long tests (#1253)
brawner
committed
Simplify and fix allocator memory strategy unit test for connext (#1252)
brawner
committed