Added py_test rule to Bazel

py_test rule enable to use a test written in Python. A py_test is
basically a py_binary that returns a non null on failure. Extraneous
support is need to have nice output (see //src/test/shell/unittest.bash
for the kind of support neeeded).

Actually the py_test code was already there but it was just missing the
necessary glue code. Also added an integration test for py_* rules in
Bazel.

--
MOS_MIGRATED_REVID=91407748

4 files changed, 45 insertions, 0 deletions

diff --git a/examples/BUILD b/examples/BUILD
index 0e42866a36..3ce954ea6a 100644
--- a/examples/BUILD
+++ b/examples/BUILD
@@ -10,5 +10,6 @@ filegroup(
         "//examples/objc:srcs",
         "//examples/proto:srcs",
         "//examples/py:srcs",
+        "//examples/py_native:srcs",
     ],
 )
diff --git a/examples/py_native/BUILD b/examples/py_native/BUILD
index 3d8de94251..d6fdfa957b 100644
--- a/examples/py_native/BUILD
+++ b/examples/py_native/BUILD
@@ -1,3 +1,9 @@
+filegroup(
+    name = "srcs",
+    srcs = glob(["*.py"]) + ["BUILD"],
+    visibility = ["//examples:__pkg__"],
+)
+
 py_binary(
     name = "bin",
     srcs = ["bin.py"],
@@ -8,3 +14,15 @@ py_library(
     name = "lib",
     srcs = ["lib.py"],
 )
+
+py_test(
+    name = "test",
+    srcs = ["test.py"],
+    deps = [":lib"],
+)
+
+py_test(
+    name = "fail",
+    srcs = ["fail.py"],
+    deps = [":lib"],
+)
diff --git a/examples/py_native/fail.py b/examples/py_native/fail.py
new file mode 100644
index 0000000000..98e35f4ee7
--- /dev/null
+++ b/examples/py_native/fail.py
@@ -0,0 +1,13 @@
+"""A tiny example binary for the native Python rules of Bazel."""
+import unittest
+from examples.py_native.lib import GetNumber
+
+
+class TestGetNumber(unittest.TestCase):
+
+  def test_fail(self):
+    self.assertEquals(GetNumber(), 0)
+
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/examples/py_native/test.py b/examples/py_native/test.py
new file mode 100644
index 0000000000..811eee144e
--- /dev/null
+++ b/examples/py_native/test.py
@@ -0,0 +1,13 @@
+"""A tiny example binary for the native Python rules of Bazel."""
+import unittest
+from examples.py_native.lib import GetNumber
+
+
+class TestGetNumber(unittest.TestCase):
+
+  def test_ok(self):
+    self.assertEquals(GetNumber(), 42)
+
+
+if __name__ == '__main__':
+  unittest.main()