added missing unit test
minor #10558 [DependencyInjection] added missing unit test (fabpot)

This PR was merged into the 2.3 branch.

Discussion
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[DependencyInjection] added missing unit test

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Added a unit test to ensure that #10536 won't break BC.

Commits
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47d1592 added missing unit test
Avoid levenshtein comparison when using ContainerBuilder.
bug #10536 Avoid levenshtein comparison when using ContainerBuilder. (catch56)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #10536).

Discussion
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Avoid levenshtein comparison when using ContainerBuilder.

[DependencyInjection] ContainerBuilder catches exceptions when a service isn't found by Container::get().

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

In the process of building the exception message, I saw over 13k calls to levenshtein() when profiling a Drupal request where there's no compiled container yet, this adds around 36ms+ to the request for the function calls themselves, more for the overall logic.

Made the levenshtein calls optional based on a property on the class, then ContainerBuilder can set that to false and skip the suggestions.

![lev-before](https://f.cloud.github.com/assets/116285/2525110/d6dd3a90-b4eb-11e3-934a-a3726e0f8f09.png)
![lev-after](https://f.cloud.github.com/assets/116285/2525114/dd2de0fc-b4eb-11e3-8df0-598cadf2286b.png)

Commits
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cc9cc37 Avoid levenshtein comparison when using ContainerBuilder.
fixed CS