[pdsl_core] Add test_utils helper library

This will help writing tests with general setup and tear-down mechanics.
Used to initialize env_logger for every unit test.

pdsl_core/Cargo.toml

@@ -23,6 +23,9 @@ parity-codec-derive = { version = "2.0" }
 tiny-keccak = "1.4"
 log = "0.4"
 
+[dev-dependencies]
+env_logger = { version = "0.6", default-features = false }
+
 [features]
 default = []
 test-env = []

pdsl_core/src/lib.rs

@@ -14,6 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with pDSL.  If not, see <http://www.gnu.org/licenses/>.
 
+#[cfg(test)]
+#[macro_use]
+mod test_utils;
+
 mod byte_utils;
 pub mod env;
 pub mod hash;

pdsl_core/src/test_utils.rs

+//! The minimal test framework for the pdsl core libraries.
+
+/// The set-up procedure of the entire crate under test.
+fn setup() {
+	let _ = env_logger::try_init();
+}
+
+/// The tear-down procedure of the entire crate under test.
+fn teardown() {}
+
+/// Runs the given test.
+///
+/// This executes general setup routines before executing
+/// the test and general tear-down procedures after executing.
+pub(crate) fn run_test<F>(test: F) -> ()
+    where F: FnOnce() -> () + std::panic::UnwindSafe
+{
+    setup();
+    let result = std::panic::catch_unwind(|| {
+        test()
+    });
+    teardown();
+    assert!(result.is_ok())
+}