test: make api test error show error message

[allencloud]

Signed-off-by: Allen Sun [email protected]

Ⅰ. Describe what this PR did

make api test error show error message, since we found that in CI there is no detailed error message:

10:20:07 /go/src/github.com/alibaba/pouch/test/api_volume_list_test.go:26:
10:20:07     // Create a volume with the name "TestVolume1".
10:20:07     err := CreateVolume(c, "TestVolume1", "local")
10:20:07 /go/src/github.com/alibaba/pouch/test/utils.go:229:
10:20:07     c.Assert(resp.StatusCode, check.Equals, 201)
10:20:07 ... obtained int = 500
10:20:07 ... expected int = 201

Ⅱ. Does this pull request fix one issue?

None

Ⅲ. Describe how you did it

None

Ⅳ. Describe how to verify it

None

Ⅴ. Special notes for reviews

@Letty5411

[Letty5411]

LGTM

[codecov-io]

Codecov Report

Merging #704 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #704   +/-   ##
======================================
  Coverage    10.7%   10.7%           
======================================
  Files          92      92           
  Lines        5383    5383           
======================================
  Hits          576     576           
  Misses       4757    4757           
  Partials       50      50

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