testsuite/t2004-hydra.t

Problem: hydra tests fail occasionally

As noted in flux-framework#1169, some versions of hydra might have a problem
capturing stdio, which makes these tests unreliable.  Drop the
tests that are just verifying hydra's PMI behavior, and make the
ones that remain not dependent on stdio.

Fixes flux-framework#1169

t/t2004-hydra.t

@@ -19,33 +19,12 @@ test_expect_success 'Hydra runs hello world' '
 
 count_uniq_lines() { sort $1 | uniq | wc -l; }
 
-test_expect_success 'Hydra sets PMI_FD to unique value' '
-	mpiexec.hydra -n 4 printenv PMI_FD > out &&
-	test_debug "cat out" &&
-	test $(count_uniq_lines out) -eq 4
-'
-
-test_expect_success 'Hydra sets PMI_RANK to unique value' '
-	mpiexec.hydra -n 4 printenv PMI_RANK > out2 &&
-	test_debug "cat out2" &&
-	test $(count_uniq_lines out2) -eq 4
-'
-
-test_expect_success 'Hydra sets PMI_SIZE to uniform value' '
-	mpiexec.hydra -n 4 printenv PMI_SIZE > out3 &&
-	test_debug "cat out3" &&
-	test $(count_uniq_lines out3) -eq 1
-'
-
 test_expect_success 'Flux libpmi-client wire protocol works with Hydra' '
 	mpiexec.hydra -n 4 ${PMI_INFO}
 '
 
 test_expect_success 'Hydra can launch Flux' '
-	mpiexec.hydra -n 4 flux start \
-		flux comms info >flux_out &&
-	test_debug "cat flux_out" &&
-	grep size=4 flux_out
+	mpiexec.hydra -n 4 flux start flux getattr size
 '
 
 test_done