rust: repurpose qemu_api -> tests

The crate purpose is only to provide integration tests at this point,
that can't easily be moved to a specific crate.

It's also often a good practice to have a single integration test crate
(see for ex https://github.com/rust-lang/cargo/issues/4867)

Drop README.md, use docs/devel/rust.rst instead.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Link: https://lore.kernel.org/r/20250827104147.717203-20-marcandre.lureau@redhat.com
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/tests/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "tests"
+version = "0.1.0"
+description = "Rust integration tests for QEMU"
+resolver = "2"
+publish = false
+
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+common = { path = "../common" }
+chardev = { path = "../chardev" }
+hwcore = { path = "../hw/core" }
+migration = { path = "../migration" }
+util = { path = "../util" }
+bql = { path = "../bql" }
+qemu_macros = { path = "../qemu-macros" }
+qom = { path = "../qom" }
+system = { path = "../system" }
+
+[lints]
+workspace = true

rust/tests/meson.build

@@ -0,0 +1,14 @@
+test('rust-integration',
+    executable(
+        'rust-integration',
+        files('tests/vmstate_tests.rs'),
+        override_options: ['rust_std=2021', 'build.rust_std=2021'],
+        rust_args: ['--test'],
+        install: false,
+        dependencies: [bql_rs, common_rs, util_rs, migration_rs, qom_rs]),
+    args: [
+        '--test', '--test-threads', '1',
+        '--format', 'pretty',
+    ],
+    protocol: 'rust',
+    suite: ['unit', 'rust'])