cmd/go/internal/imports: remove test dependency on json internals
TestScan loads encoding/json and verifies that various imports
match expectations. The new v2 encoding/json violates these
expectations. Since this test is testing the ScanDir function,
not encoding/json, change it to use a test package with defined
imports instead.
Change-Id: I68a0813ccf37daadbd6ea52872a8ac132141e82a
Reviewed-on: https://go-review.googlesource.com/c/go/+/665795 Reviewed-by: Alan Donovan <adonovan@google.com>
TryBot-Bypass: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>