Fix cargo test --doc not testing examples

[mkroman]

When running cargo doc --test in a project folder, cargo does not test documentation examples, it only builds the project and exits.

Refer to issue #2684

[rust-highfive]

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[alexcrichton]

Thanks! Could you be sure to add a test for this as well?

[mkroman]

@alexcrichton I've updated your test to validate the output, but I've been unable to resolve the issue where a test fails when testing with Rust Beta on OS X.

Is it something wrong with my changes, or does test_cargo_doc::doc_multiple_deps just not clean up properly?

Edit:
The test seems to have been fixed.

[alexcrichton]

@bors: r+ 3988946

Thanks!

[bors]

⌛ Testing commit 3988946 with merge a394619...

[bors]

💔 Test failed - cargo-win-gnu-32

[alexcrichton]

@bors: retry

On Tue, May 17, 2016 at 10:00 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - cargo-win-gnu-32
http://buildbot.rust-lang.org/builders/cargo-win-gnu-32/builds/500

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#2685 (comment)

[bors]

⚡ Previous build results for cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64 are reusable. Rebuilding only cargo-win-gnu-32...

[bors]

☀️ Test successful - cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64