Running state test using parity-evm (#6355)

* Initial version of state tests.

* Refactor state to support tracing.

* Unify TransactResult.

* Add test.

ethcore/src/trace/executive_tracer.rs

@@ -167,7 +167,7 @@ impl Tracer for ExecutiveTracer {
 		ExecutiveTracer::default()
 	}
 
-	fn traces(self) -> Vec<FlatTrace> {
+	fn drain(self) -> Vec<FlatTrace> {
 		self.traces
 	}
 }

ethcore/src/trace/mod.rs

@@ -85,7 +85,7 @@ pub trait Tracer: Send {
 	fn subtracer(&self) -> Self where Self: Sized;
 
 	/// Consumes self and returns all traces.
-	fn traces(self) -> Vec<FlatTrace>;
+	fn drain(self) -> Vec<FlatTrace>;
 }
 
 /// Used by executive to build VM traces.

ethcore/src/trace/noop_tracer.rs

@@ -62,7 +62,7 @@ impl Tracer for NoopTracer {
 		NoopTracer
 	}
 
-	fn traces(self) -> Vec<FlatTrace> {
+	fn drain(self) -> Vec<FlatTrace> {
 		vec![]
 	}
 }