insane.bbclass: Add unimplemented-ptest detection for cargo-based tests

Extend unimplemented-ptest QA check to detect Rust tests.
Note: To enable this QA check, add the following to your local.conf:
  WARN_QA += "unimplemented-ptest"

Examples of Rust-based meta-oe packages triggering unimplemented-ptest:

WARNING: cbindgen-0.28.0-r0 do_patch: QA Issue: cbindgen: cargo-based tests detected [unimplemented-ptest]
WARNING: fdfindd-10.2-r0 do_patch: QA Issue: fdfindd: cargo-based tests detected [unimplemented-ptest]
WARNING: deqp-runner-0.20.3-r0 do_patch: QA Issue: deqp-runner: cargo-based tests detected [unimplemented-ptest]
WARNING: bindgen-cli-0.71.1-r0 do_patch: QA Issue: bindgen-cli: cargo-based tests detected [unimplemented-ptest]
WARNING: python3-maturin-1.8.3-r0 do_patch: QA Issue: python3-maturin: cargo-based tests detected [unimplemented-ptest]
WARNING: uutils-coreutils-0.0.30-r0 do_patch: QA Issue: uutils-coreutils: cargo-based tests detected [unimplemented-ptest]

(From OE-Core rev: c3c10f00b1f4d4a092e5d3834ec0ba6abd6ac969)

Signed-off-by: Ines KCHELFI <ines.kchelfi@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-global/insane.bbclass

@@ -1332,6 +1332,13 @@ python do_qa_patch() {
     elif os.path.exists(os.path.join(srcdir, "Makefile.in")) and (match_line_in_files(srcdir, "**/Makefile.in", r'\s*TESTS\s*\+?=') or match_line_in_files(srcdir,"**/*.at",r'.*AT_INIT')):
         oe.qa.handle_error("unimplemented-ptest", "%s: autotools-based tests detected" % d.getVar('PN'), d)
 
+    # Detect cargo-based tests
+    elif os.path.exists(os.path.join(srcdir, "Cargo.toml")) and (
+        match_line_in_files(srcdir, "**/*.rs", r'\s*#\s*\[\s*test\s*\]') or 
+        match_line_in_files(srcdir, "**/*.rs", r'\s*#\s*\[\s*cfg\s*\(\s*test\s*\)\s*\]')
+    ):
+        oe.qa.handle_error("unimplemented-ptest", "%s: cargo-based tests detected" % d.getVar('PN'), d)
+
     # Last resort, detect a test directory in sources
     elif os.path.exists(srcdir) and any(filename.lower() in ["test", "tests"] for filename in os.listdir(srcdir)):
         oe.qa.handle_error("unimplemented-ptest", "%s: test subdirectory detected" % d.getVar('PN'), d)