Switch to config-driven style

src/python/grpcio_tests/tests/unit/BUILD.bazel

@@ -83,7 +83,6 @@ py_library(
     srcs = ["_from_grpc_import_star.py"],
 )
 
-[
 [
     py2and3_test(
         name=test_file_name[:-3],
@@ -108,15 +107,6 @@ py_library(
         data=[
             "//src/python/grpcio_tests/tests/unit/credentials",
         ],
-        ),
-        sh_test(
-            name = test_file_name[:-3] + ".single_threaded_unary_stream",
-            data = ["{}.python3".format(test_file_name[:-3])],
-            args = ["{}.python3".format(test_file_name[:-3])],
-            size = "small",
-            srcs = ["_single_threaded_unary_stream_test_runner.sh"]
-        )
-    ]
-    for test_file_name in GRPCIO_TESTS_UNIT
+    ) for test_file_name in GRPCIO_TESTS_UNIT
 ]
 

src/python/grpcio_tests/tests/unit/_single_threaded_unary_stream_test_runner.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-
-export GRPC_SINGLE_THREADED_UNARY_STREAM=true
-
-find . -name "$1" -exec {} \;

tools/bazel.rc

@@ -86,3 +86,5 @@ build:basicprof --copt=-DNDEBUG
 build:basicprof --copt=-O2
 build:basicprof --copt=-DGRPC_BASIC_PROFILER
 build:basicprof --copt=-DGRPC_TIMERS_RDTSC
+
+build:python_single_threaded_unary_stream --test_env="GRPC_SINGLE_THREADED_UNARY_STREAM=true"

tools/internal_ci/linux/grpc_python_bazel_test_in_docker.sh

@@ -24,8 +24,11 @@ git clone /var/local/jenkins/grpc /var/local/git/grpc
 && git submodule update --init --reference /var/local/jenkins/grpc/${name} \
 ${name}')
 cd /var/local/git/grpc/test
-bazel test --spawn_strategy=standalone --genrule_strategy=standalone --test_output=errors //src/python/...
-bazel test --spawn_strategy=standalone --genrule_strategy=standalone --test_output=errors //examples/python/...
+TEST_TARGETS="//src/python/... //examples/python/..."
+BAZEL_FLAGS="--spawn_strategy=standalone --genrule_strategy=standalone --test_output=errors"
+bazel test ${BAZEL_FLAGS} ${TEST_TARGETS}
+bazel test --config=python_single_threaded_unary_stream ${BAZEL_FLAGS} ${TEST_TARGETS}
+
 
 # TODO(https://github.com/grpc/grpc/issues/19854): Move this to a new Kokoro
 # job.