Ginkgo dryRun outputs "slow tests"

[nodo]

When running ginkgo with the -dryRun flag, it wrongly warns the user about slow tests.

For instance using this test:

var _ = Describe("Playground", func() {
	It("succeeds", func() {
		Expect(1).To(Equal(1))
	})
})

It outputs the following:

$> ginkgo -dryRun .
Running Suite: Playground Suite
===============================
Random Seed: 1519999176
Will run 1 of 1 specs

• [SLOW TEST:9223372036.855 seconds]
Playground
/Users/pivotal/go/src/github.com/nodo/playground/playground/playground_test.go:8
  succeeds
  /Users/pivotal/go/src/github.com/nodo/playground/playground/playground_test.go:9
------------------------------

Ran 1 of 1 Specs in 0.000 seconds
SUCCESS! -- 0 Passed | 0 Failed | 0 Pending | 0 Skipped PASS

Ginkgo ran 1 suite in 612.596828ms
Test Suite Passed

Note that the test took 612ms to run, but the warns says it took 9223372036.855 seconds. We would expect to not see the warning.

with @kirederik