Make sure macOS wheel verification has test data

Author: nealrichardson

cpp/src/arrow/flight/test_util.cc

@@ -454,7 +454,7 @@ Status TestClientBasicAuthHandler::GetToken(std::string* token) {
 Status GetTestResourceRoot(std::string* out) {
   const char* c_root = std::getenv("ARROW_TEST_DATA");
   if (!c_root) {
-    return Status::IOError("Test resources not found, set ARROW_TEST_DATA");
+    return Status::IOError("Test resources not found, set ARROW_TEST_DATA to <repo root>/testing/data");
   }
   *out = std::string(c_root);
   return Status::OK();

dev/release/verify-release-candidate.sh

@@ -637,6 +637,10 @@ test_linux_wheels() {
 
 test_macos_wheels() {
   local py_arches="2.7m 3.5m 3.6m 3.7m 3.8"
+  if [ ! -d "arrow-testing" ]; then
+    git clone https://github.com/apache/arrow-testing.git
+  fi
+  export ARROW_TEST_DATA=$PWD/arrow-testing/data
 
   for py_arch in ${py_arches}; do
     local env=_verify_wheel-${py_arch}

python/pyarrow/tests/test_flight.py

@@ -60,7 +60,7 @@ def resource_root():
     """Get the path to the test resources directory."""
     if not os.environ.get("ARROW_TEST_DATA"):
         raise RuntimeError("Test resources not found; set "
-                           "ARROW_TEST_DATA to <repo root>/testing")
+                           "ARROW_TEST_DATA to <repo root>/testing/data")
     return pathlib.Path(os.environ["ARROW_TEST_DATA"]) / "flight"