test: skip tcp-write-in-a-row on IBM i (#4197)

On IBM i this test fails asserting the write queue size.
The test expects the queue size to be greater than 0 but
the queue size is 0 o

test: skip tcp-write-in-a-row on IBM i (#4197)

On IBM i this test fails asserting the write queue size.
The test expects the queue size to be greater than 0 but
the queue size is 0 on IBM i.

https://github.com/libuv/libuv/blob/66160d6973b41040f6b2066a84359147258f60c3/test/test-tcp-write-in-a-row.c#L75

The test expects the write to get queued because the size of the data
is larger than the send and receive buffers.

https://github.com/libuv/libuv/blob/66160d6973b41040f6b2066a84359147258f60c3/test/test-tcp-write-in-a-row.c#L39-L40

For some reason the request does not seem to get queued on IBM i.
The root cause of the issue will need further investigation.

Part of #4143

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test: switch to new-style ASSERT_EQ macros (#4159)

Switch from old-style ASSERT macro to new-style ASSERT_EQ,... macros.

Using new-style macros makes it easier to debug test failure

test: switch to new-style ASSERT_EQ macros (#4159)

Switch from old-style ASSERT macro to new-style ASSERT_EQ,... macros.

Using new-style macros makes it easier to debug test failures

Fixes: https://github.com/libuv/libuv/issues/2974

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test: silence more valgrind warnings (#3917)

Pass the loop to MAKE_VALGRIND_HAPPY() so it's explicit on which loop
needs to be cleaned up. Since it asserts on uv_loop_close(), need to

test: silence more valgrind warnings (#3917)

Pass the loop to MAKE_VALGRIND_HAPPY() so it's explicit on which loop
needs to be cleaned up. Since it asserts on uv_loop_close(), need to
remove a couple of those that were being done before the call.

Cleanup where loop was assigned, so the entire test either uses loop or
uv_default_loop(). Not both.

Also take care of any reqs that may have been left uncleaned.

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test: fix some unreachable code warnings (#3851)

stream: process more than one write req per loop tick (#3728)

Fixes: https://github.com/libuv/libuv/issues/3668