Add an e2e test

[tdmanv]

Change Overview

Adds a test which exercises an entire workflow for KubeExec

Pull request type

Please check the type of change your PR introduces:

• Work in Progress
• Refactoring (no functional changes, no api changes)
• Trival/Minor
• Bugfix
• Feature
• Documentation
• Test

Test Plan

/go/src/github.com/kanisterio/kanister # go test -v ./pkg/testing/ -check.v
=== RUN   Test
time="2019-09-09T00:20:57Z" level=info msg="Added blueprint test-blueprint-99jw7"
time="2019-09-09T00:20:57Z" level=info msg="Executing action test"
time="2019-09-09T00:20:57Z" level=info msg="Created actionset test-actionset-s9dw5 and started executing actions"
time="2019-09-09T00:20:57Z" level=info msg="Executing phase test-kube-exec"
time="2019-09-09T00:20:57Z" level=info msg="Updated ActionSet 'test-actionset-s9dw5' Status->pending"
time="2019-09-09T00:20:57Z" level=info msg="Updated ActionSet 'test-actionset-s9dw5' Status->running, Phase: test-kube-exec->pending"
time="2019-09-09T00:20:57Z" level=info msg="Pod: test-deployment-h98mw-6f6955dfd7-rfwkt Container: test-container Out: hello echo hello"
time="2019-09-09T00:20:57Z" level=info msg="Completed phase test-kube-exec"
time="2019-09-09T00:20:57Z" level=info msg="Updated ActionSet 'test-actionset-s9dw5' Status->complete"
PASS: e2e_test.go:83: E2ESuite.TestKubeExec     2.048s
OK: 1 passed
--- PASS: Test (3.66s)
PASS
ok      github.com/kanisterio/kanister/pkg/testing      3.677s

• Manual
• Unit test
• E2E

[ewhamilton]

LGTM

[pavannd1]

💯