Fix :protobuf_objc bazel target (#7538)

* Potential 3.12 ObjC bazel patch

* Add test targets to bazel test

* Remove :protobuf_objc test target
diff --git a/BUILD b/BUILD
index 8ab4cb4..b32a1f1 100644
--- a/BUILD
+++ b/BUILD
@@ -969,6 +969,16 @@
 objc_library(
     name = "protobuf_objc",
     hdrs = [
+        "objectivec/GPBAny.pbobjc.h",
+        "objectivec/GPBApi.pbobjc.h",
+        "objectivec/GPBDuration.pbobjc.h",
+        "objectivec/GPBEmpty.pbobjc.h",
+        "objectivec/GPBFieldMask.pbobjc.h",
+        "objectivec/GPBSourceContext.pbobjc.h",
+        "objectivec/GPBStruct.pbobjc.h",
+        "objectivec/GPBTimestamp.pbobjc.h",
+        "objectivec/GPBType.pbobjc.h",
+        "objectivec/GPBWrappers.pbobjc.h",
         "objectivec/GPBArray.h",
         "objectivec/GPBBootstrap.h",
         "objectivec/GPBCodedInputStream.h",
@@ -1017,6 +1027,16 @@
         "objectivec",
     ],
     non_arc_srcs = [
+        "objectivec/GPBAny.pbobjc.m",
+        "objectivec/GPBApi.pbobjc.m",
+        "objectivec/GPBDuration.pbobjc.m",
+        "objectivec/GPBEmpty.pbobjc.m",
+        "objectivec/GPBFieldMask.pbobjc.m",
+        "objectivec/GPBSourceContext.pbobjc.m",
+        "objectivec/GPBStruct.pbobjc.m",
+        "objectivec/GPBTimestamp.pbobjc.m",
+        "objectivec/GPBType.pbobjc.m",
+        "objectivec/GPBWrappers.pbobjc.m",
         "objectivec/GPBArray.m",
         "objectivec/GPBCodedInputStream.m",
         "objectivec/GPBCodedOutputStream.m",
@@ -1031,16 +1051,6 @@
         "objectivec/GPBUtilities.m",
         "objectivec/GPBWellKnownTypes.m",
         "objectivec/GPBWireFormat.m",
-        "objectivec/google/protobuf/Any.pbobjc.m",
-        "objectivec/google/protobuf/Api.pbobjc.m",
-        "objectivec/google/protobuf/Duration.pbobjc.m",
-        "objectivec/google/protobuf/Empty.pbobjc.m",
-        "objectivec/google/protobuf/FieldMask.pbobjc.m",
-        "objectivec/google/protobuf/SourceContext.pbobjc.m",
-        "objectivec/google/protobuf/Struct.pbobjc.m",
-        "objectivec/google/protobuf/Timestamp.pbobjc.m",
-        "objectivec/google/protobuf/Type.pbobjc.m",
-        "objectivec/google/protobuf/Wrappers.pbobjc.m",
     ],
     visibility = ["//visibility:public"],
 )
diff --git a/kokoro/linux/bazel/build.sh b/kokoro/linux/bazel/build.sh
index 9355eba..5f34bea 100755
--- a/kokoro/linux/bazel/build.sh
+++ b/kokoro/linux/bazel/build.sh
@@ -26,6 +26,9 @@
 bazel test --copt=-Werror --host_copt=-Werror \
   //:build_files_updated_unittest \
   //java/... \
+  //:protoc \
+  //:protobuf \
+  //:protobuf_python \
   //:protobuf_test \
   @com_google_protobuf//:cc_proto_blacklist_test
 trap - EXIT