pw_bluetooth_sapphire: Add sm Bazel unit test target

Bug: b/359241441
Test: bazel test //pw_bluetooth_sapphire/host/...
      --platforms=//pw_unit_test:googletest_platform
      --@pigweed//pw_unit_test:backend=@pigweed//pw_unit_test:googletest
Change-Id: Id093c63085e3d136dec464e234da63af8f3eaaac
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/234038
Lint: Lint 🤖 <[email protected]>
Pigweed-Auto-Submit: Ben Lawson <[email protected]>
Commit-Queue: Auto-Submit <[email protected]>
Reviewed-by: Faraaz Sareshwala <[email protected]>

pw_bluetooth_sapphire/host/sm/BUILD.bazel

@@ -11,6 +11,8 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under
 # the License.
+
+load("@pigweed//pw_build:pigweed.bzl", "pw_cc_test")
 load("//pw_bluetooth_sapphire/host:variables.bzl", "COPTS")
 
 package(default_visibility = ["//visibility:public"])
@@ -73,9 +75,8 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "sm_test.lib",
-    testonly = True,
+pw_cc_test(
+    name = "sm_test",
     srcs = [
         "ecdh_key_test.cc",
         "error_test.cc",
@@ -94,15 +95,12 @@ cc_library(
         "util_test.cc",
     ],
     copts = COPTS,
-    tags = ["manual"],
-    visibility = ["//visibility:public"],
+    test_main = "//pw_bluetooth_sapphire/host/testing:gtest_main",
     deps = [
         ":sm",
         ":testing",
         "//pw_bluetooth_sapphire/host/hci:testing",
         "//pw_bluetooth_sapphire/host/l2cap:testing",
         "//pw_bluetooth_sapphire/host/testing",
-        "//pw_bluetooth_sapphire/host/testing:gtest_main",
     ],
-    alwayslink = 1,
 )