Put integration tests behind feature flag (#515)

* subxt: Add integration-tests feature flag

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Guard integration tests under feature flag

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* test-runtime: Place build.rs under feature flag

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Pass `integration-tests` feature to `test-runtime`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* CI: Use `integration-tests` feature to run all tests

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Rely on `#[cfg(feature = "integration-tests")]` for integration

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt/metadata: Manually construct test metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* artifacts: Move scale binary blob to dedicated folder

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* examples: Update path to metadata blob

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Rely on artifact metadata blob for benches

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Remove `test-runtime` dependency

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* examples: Modify runtime path for `custom_type_derives`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Remove tests folder

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* test-runtime: Remove `integration-tests` feature flag

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* integration-tests: Add an integration test crate for subxt

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Remove `test-runtime` dependency

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Add comment for feature flags

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* integration-tests: Trim dependencies

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* integration-tests: Move dependencies under dev

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Revert "CI: Use `integration-tests` feature to run all tests"

This reverts commit 8e5f38ba8c633ac40420fadf58700ac402f762d4.

* integration-tests: Remove integration folder

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Fix feature flag and test comment

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Extra feature flag comment

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* integration-tests: Move tests content under src

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

integration-tests/src/frame/mod.rs

@@ -0,0 +1,24 @@
+// Copyright 2019-2022 Parity Technologies (UK) Ltd.
+// This file is part of subxt.
+//
+// subxt is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// subxt is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with subxt.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Test interactions with some built-in FRAME pallets.
+
+mod balances;
+mod contracts;
+mod staking;
+mod sudo;
+mod system;
+mod timestamp;