Index "test"-kind source paths

[nastevens]

Previously the dependency kind "test" was not accepted by the dependencies logic, so test files were not indexed. This affected jumping between tags inside tests - since no ctags were generated for these files, there usually weren't tags to jump to.

I actually came across this from a slightly different angle: I have a workspace that has a root project containing only integration tests, i.e. no lib or bin types. So rusty-tags was not able to find the root project package because it had the following targets:

            "id": "updater 0.1.0 (path+file:///Users/nick/projects/updater-ng/updater-ng)",
            "targets": [
                {
                    "crate_types": [
                        "bin"
                    ],
                    "edition": "2015",
                    "kind": [
                        "test"
                    ],
                    "name": "test_round_trip",
                    "src_path": "/Users/nick/projects/updater-ng/updater-ng/tests/test_round_trip.rs"
                },
                {
                    "crate_types": [
                        "bin"
                    ],
                    "edition": "2015",
                    "kind": [
                        "test"
                    ],
                    "name": "lib",
                    "src_path": "/Users/nick/projects/updater-ng/updater-ng/tests/lib.rs"
                }
            ],

Therefore the updater package never got added to the dependencies list, leading to a later error Couldn't find package for (updater, 0.1.0)

So this could be taken as a "feature" or a "bugfix" - kind of both. Let me know if you'd like me to reword anything.

[dan-t]

Thanks!