test: Use automatic test detection

Move from `test/` to `tests/`, which is the directory for autodetection.
This means that we can drop `[[test]]` entries in `libc-test/Cargo.toml`
that don't require nondefault configuration like `harness = false`.

Author: tgross35

libc-test/Cargo.toml

@@ -30,79 +30,44 @@ extra_traits = ["libc/extra_traits"]
 
 [[test]]
 name = "main"
-path = "test/main.rs"
+path = "tests/main.rs"
 harness = false
 
 [[test]]
 name = "linux-fcntl"
-path = "test/linux_fcntl.rs"
+path = "tests/linux_fcntl.rs"
 harness = false
 
 [[test]]
 name = "linux-if-arp"
-path = "test/linux_if_arp.rs"
+path = "tests/linux_if_arp.rs"
 harness = false
 
 [[test]]
 name = "linux-ipv6"
-path = "test/linux_ipv6.rs"
+path = "tests/linux_ipv6.rs"
 harness = false
 
 [[test]]
 name = "linux-elf"
-path = "test/linux_elf.rs"
+path = "tests/linux_elf.rs"
 harness = false
 
 [[test]]
 name = "linux-strerror_r"
-path = "test/linux_strerror_r.rs"
+path = "tests/linux_strerror_r.rs"
 harness = false
 
 [[test]]
 name = "linux-termios"
-path = "test/linux_termios.rs"
+path = "tests/linux_termios.rs"
 harness = false
 
-[[test]]
-name = "cmsg"
-path = "test/cmsg.rs"
-harness = true
-
-[[test]]
-name = "makedev"
-path = "test/makedev.rs"
-harness = true
-
-[[test]]
-name = "errqueue"
-path = "test/errqueue.rs"
-harness = true
-
-[[test]]
-name = "sigrt"
-path = "test/sigrt.rs"
-harness = true
-
 [[test]]
 name = "semver"
-path = "test/semver.rs"
+path = "tests/semver.rs"
 harness = false
 
-[[test]]
-name = "primitive_types"
-path = "test/primitive_types.rs"
-harness = true
-
-[[test]]
-name = "style"
-path = "test/check_style.rs"
-harness = true
-
-[[test]]
-name = "style_tests"
-path = "test/style_tests.rs"
-harness = true
-
 # FIXME(msrv): These should be moved to the root Cargo.toml as `[workspace.lints.*]`
 #              once MSRV is above 1.64 and replaced with `[lints] workspace=true`