test: remove redundant helpers

pkg/arvo/lib/test.hoon

@@ -1,20 +1,6 @@
 ::  testing utilities meant to be directly used from files in %/tests
 ::
 |%
-++  expect-yes
-  |=  [message=tape actual=?]
-  ^-  tang
-  ?:  actual  ~
-  [leaf+message]~
-::
-++  expect-crash
-  |*  [message=tape go=(trap)]
-  ^-  tang
-  =/  res  (mule go)
-  ?-  -.res
-    %|  ~
-    %&  ~[leaf+"expected crash" leaf+message]
-  ==
 ::  +expect-eq: compares :expected and :actual and pretty-prints the result
 ::
 ++  expect-eq

pkg/arvo/tests/sys/vane/clay.hoon

@@ -35,7 +35,7 @@
     !>  (parse-pile:(ford):fusion /sur/foo/hoon ".")
 ::
 ++  test-parse-fail  ^-  tang
-  %+  expect-crash  "parsing should have failed"
+  %-  expect-fail
   |.  (parse-pile:(ford):fusion /sur/foo/hoon "[")
 ::
 ++  test-hello-gen  ^-  tang