+ add a test for parseAndRemoveLogLevel()
+ add a test for drainPendingMessages()
+ test JSON log encoding including several special cases
Other tests frequently send logs but a) don't check the result and
b) do so by happenstance, such that the code in encode() was not
consistently being exercised and leading to spurious changes in
code coverage. These tests attempt to more systematically test
the logging function.
This is the second attempt to add these tests, the first attempt
(in https://github.com/tailscale/tailscale/pull/1114) had two issues:
1. httptest.NewServer creates multiple goroutine handlers, and
logtail uses goroutines to upload, but the first version had no
locking in the server to guard this.
Moved data handling into channels to get synchronization.
2. The channel to notify the test of the arrival of data had a depth
of 1, in cases where the Logger sent multiple uploads it would
block the server.
This resulted in the first iteration of these tests being flaky,
and we reverted it.
This new version of the tests has passed with
go test -race -count=10000
and seems solid.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
Denton Gentry
013da6660e