krisl / graferse / 35818440800

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test: share the topology behind the two opposing-direction tests

Both "never adjacent nodes" tests built the same nine node graph, and
differed in one line: whether the E to F leg is one way or two.  Each
also named all nine nodes and never used one of them, driving agents by
id instead.

makeOpposingGraph({ bidirectionalEF }) builds it once and hands back
the two paths.  Assertions are untouched.

262 of 289 branches covered (90.66%)

Branch coverage included in aggregate %.

379 of 394 relevant lines covered (96.19%)

1504.41 hits per line