Move integration test to integration tests folder & clean up (#1579)

* move integration test to integration tests folder

* inline tests module

Author: Robbepop

crates/wasmi/src/engine/tests/mod.rs crates/wasmi/src/engine/tests.rscrates/wasmi/src/engine/tests/mod.rs renamed to crates/wasmi/src/engine/tests.rs

@@ -1,4 +1,4 @@
-mod host_calls;
+//! APIs to test and introspect Wasmi engine internals.
 
 use super::{
     code_map::{CompiledFuncRef, EngineFunc},

…tes/wasmi/src/engine/tests/host_calls.rs …ests/integration/call_host_via_engine.rscrates/wasmi/src/engine/tests/host_calls.rs renamed to crates/wasmi/tests/integration/call_host_via_engine.rs crates/wasmi/src/engine/tests/host_calls.rs renamed to crates/wasmi/tests/integration/call_host_via_engine.rs

@@ -1,6 +1,6 @@
 //! This submodule tests the unusual use case of calling host functions through the engine from the host side.
 
-use crate::{Caller, Config, Engine, Error, Func, Linker, Module, Store};
+use wasmi::{Caller, Config, Engine, Error, Func, Linker, Module, Store};
 
 /// Setup a new `Store` for testing with initial value of 5.
 fn setup_store() -> Store<i32> {

crates/wasmi/tests/integration/mod.rs

@@ -1,4 +1,5 @@
 mod call_hook;
+mod call_host_via_engine;
 mod fuel_consumption;
 mod fuel_metering;
 mod func;