Add a build_test rule. (#97)

* Add a build_test rule.

This rules (marco) provides a 'test' target that can be used to ensure other
targets build.

2 files changed, 42 insertions, 0 deletions

diff --git a/tests/BUILD b/tests/BUILD
index 8657cae..fdf00ad 100644
--- a/tests/BUILD
+++ b/tests/BUILD
@@ -1,3 +1,4 @@
+load(":build_test_tests.bzl", "build_test_test_suite")
 load(":collections_tests.bzl", "collections_test_suite")
 load(":dicts_tests.bzl", "dicts_test_suite")
 load(":maprule_tests.bzl", "maprule_test_suite")
@@ -13,6 +14,8 @@ load(":versions_tests.bzl", "versions_test_suite")
 
 licenses(["notice"])
 
+build_test_test_suite()
+
 collections_test_suite()
 
 dicts_test_suite()
diff --git a/tests/build_test_tests.bzl b/tests/build_test_tests.bzl
new file mode 100644
index 0000000..df3671f
--- /dev/null
+++ b/tests/build_test_tests.bzl
@@ -0,0 +1,39 @@
+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT 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("//rules:build_test.bzl", "build_test")
+
+def build_test_test_suite():
+    # Since the rules doesn't do anything really, it just makes some targets
+    # to get Bazel to build other targets via a `bazel test`, just make some
+    # targets to exercise the rule.
+
+    # Make a source file
+    native.genrule(
+        name = "build_test__make_src",
+        outs = ["build_test__src.cc"],
+        cmd = "echo 'int dummy() { return 0; }' > $@",
+    )
+
+    # Use it in a non-test target
+    native.cc_library(
+        name = "build_test__build_target",
+        srcs = [":build_test__make_src"],
+    )
+
+    # Wrap a build test around the target.
+    build_test(
+        name = "build_test__test",
+        targets = [":build_test__build_target"],
+    )