CI: enforce GNU run of unit and doc tests

Adds a integration tests for ensuring correctness of the doc tests. The
doc tests can only be run by using the default host target (i.e GNU).

Signed-off-by: Diana Popa <[email protected]>

Author: dianpopa

tests/integration_tests/build/test_unittests.py

@@ -22,7 +22,7 @@
 
 @pytest.mark.timeout(240)
 def test_unittests(test_session_root_path):
-    """Run all unit tests from all Rust crates in the repo."""
+    """Run unit and doc tests from all crates using default target."""
     run(
         'CARGO_TARGET_DIR={} RUST_BACKTRACE=1 cargo test --all --no-fail-fast'
         .format(
@@ -31,3 +31,15 @@ def test_unittests(test_session_root_path):
         shell=True,
         check=True
     )
+
+
+def test_gnutests(test_session_root_path):
+    """Run unit and doc tests from all crates using GNU target."""
+    run(
+        'CARGO_TARGET_DIR={} RUST_BACKTRACE=1 cargo test '
+        '--target x86_64-unknown-linux-gnu --all --no-fail-fast'.format(
+            os.path.join(test_session_root_path, CARGO_UNITTEST_REL_PATH),
+        ),
+        shell=True,
+        check=True
+    )