fix: test IAM.getUser instead of listUsers

[trivikr]

The test fails if there are more than 100 users, as it parses users from
first page of results. This code change explicitly requests for the created user
to ensure it doesn't return pages of results.

Testing

$ npm run integration -- --tags @iam

> aws-sdk@2.797.0 integration /Users/trivikr/workspace/aws-sdk-js
> cucumber.js "--tags" "@iam"

@iam
Feature: IAM

  I want to use IAM


  Scenario: Users                              # features/iam/iam.feature:7
    Given I have an IAM username "js-test"     # features/iam/iam.feature:8
    And I create an IAM user with the username # features/iam/iam.feature:9
    And I get the IAM user                     # features/iam/iam.feature:10
    Then the IAM user should exist             # features/iam/iam.feature:11
    And I delete the IAM user                  # features/iam/iam.feature:12


  Scenario: Roles                                            # features/iam/iam.feature:14
    Given I create an IAM role with name prefix "aws-sdk-js" # features/iam/iam.feature:15
    Then the IAM role should exist                           # features/iam/iam.feature:16
    And I delete the IAM role                                # features/iam/iam.feature:17


  Scenario: Error handling                              # features/iam/iam.feature:19
    Given I have an IAM username "js-test-dupe"         # features/iam/iam.feature:20
    And I create an IAM user with the username          # features/iam/iam.feature:21
    And I create an IAM user with the username          # features/iam/iam.feature:22
    Then the error code should be "EntityAlreadyExists" # features/iam/iam.feature:23
    And I delete the IAM user                           # features/iam/iam.feature:24


3 scenarios (3 passed)
13 steps (13 passed)

Checklist

• run npm run integration if integration test is changed

[alexforsyth]

+1

[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-v2-github
• Commit ID: 98001ad
• Result: SUCCEEDED
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