Add new blaze target for running the protobuf and upb crates tests us…

…ing Cargo

PiperOrigin-RevId: 673854261

rust/BUILD

@@ -299,3 +299,12 @@ pkg_zip(
         "//:LICENSE",
     ],
 )
+
+sh_binary(
+    name = "cargo_test",
+    srcs = ["cargo_test.sh"],
+    data = [
+        ":rust_crate",
+    ],
+    deps = ["@bazel_tools//tools/bash/runfiles"],
+)

rust/cargo_test.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Runs tests that are defined in the protobuf crate using Cargo.
+# This is not a hermetic task because Cargo will fetch the needed
+# dependencies from crates.io
+
+# --- begin runfiles.bash initialization ---
+# Copy-pasted from Bazel's Bash runfiles library (tools/bash/runfiles/runfiles.bash).
+set -euo pipefail
+if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+    if [[ -f "$0.runfiles_manifest" ]]; then
+    export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
+    elif [[ -f "$0.runfiles/MANIFEST" ]]; then
+    export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
+    elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+    export RUNFILES_DIR="$0.runfiles"
+    fi
+fi
+if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+    source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+    source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
+            "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
+else
+    echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
+    exit 1
+fi
+# --- end runfiles.bash initialization ---
+
+TMP_DIR=$(mktemp -d)
+trap 'rm -rf -- "$TMP_DIR"' EXIT
+CRATE=$(rlocation com_google_protobuf/rust/rust_crate.zip)
+
+unzip -d $TMP_DIR $CRATE
+cd $TMP_DIR
+
+# Run all tests except doctests
+cargo test --lib --bins --tests