add rust_crate_group test

test/rust_crate_group/BUILD.bazel

@@ -0,0 +1,28 @@
+load("@rules_rust//rust:defs.bzl", "rust_crate_group", "rust_library")
+
+rust_library(
+    name = "dep1",
+    srcs = ["dep1.rs"],
+    edition = "2021",
+)
+
+rust_library(
+    name = "dep2",
+    srcs = ["dep2.rs"],
+    edition = "2021",
+)
+
+rust_crate_group(
+    name = "dep1_and_2",
+    deps = [
+        ":dep1",
+        ":dep2",
+    ],
+)
+
+rust_library(
+    name = "test",
+    srcs = ["lib.rs"],
+    edition = "2021",
+    deps = [":dep1_and_2"],
+)

test/rust_crate_group/dep1.rs

@@ -0,0 +1 @@
+pub fn dep1() {}

test/rust_crate_group/dep2.rs

@@ -0,0 +1 @@
+pub fn dep2() {}

test/rust_crate_group/lib.rs

@@ -0,0 +1,4 @@
+fn _test() {
+    dep1::dep1();
+    dep2::dep2();
+}