Add tests for conv_linker_config

to cover the recent features.
- conv_linker_config proto with empty input
- conv_linker_config proto with existing output
- conv_linker_config proto with --append
- conv_linker_config proto with --force

Bug: n/a
Test: conv_linker_config_test
Change-Id: I0de79b6e05c2608e0e2f30dfbf04d8289672f362

scripts/conv_linker_config_test.py

@@ -16,12 +16,14 @@
 #
 """Unit tests for conv_linker_config.py."""
 
+import io
 import os
 import shutil
 import tempfile
 import unittest
 
 import conv_linker_config
+from contextlib import redirect_stderr
 from linker_config_pb2 import LinkerConfig
 
 class FileArgs:
@@ -67,6 +69,22 @@ class TempDirTest(unittest.TestCase):
 class ConvLinkerConfigTest(TempDirTest):
   """Unit tests for conv_linker_config."""
 
+
+  def test_Proto_empty_input(self):
+    self.command(['proto', '-s', '-o', FileArg('out.pb')])
+    pb = LinkerConfig()
+    pb.ParseFromString(self.read('out.pb'))
+    self.assertEqual(pb, LinkerConfig())
+
+
+  def test_Proto_single_input(self):
+    self.write('foo.json', b'{ "provideLibs": ["libfoo.so"]}')
+    self.command(['proto', '-s', FileArg('foo.json'), '-o', FileArg('out.pb')])
+    pb = LinkerConfig()
+    pb.ParseFromString(self.read('out.pb'))
+    self.assertSequenceEqual(pb.provideLibs, ['libfoo.so'])
+
+
   def test_Proto_with_multiple_input(self):
     self.write('foo.json', b'{ "provideLibs": ["libfoo.so"]}')
     self.write('bar.json', b'{ "provideLibs": ["libbar.so"]}')
@@ -76,6 +94,34 @@ class ConvLinkerConfigTest(TempDirTest):
     self.assertSetEqual(set(pb.provideLibs), set(['libfoo.so', 'libbar.so']))
 
 
+  def test_Proto_with_existing_output(self):
+    self.write('out.pb', LinkerConfig(provideLibs=['libfoo.so']).SerializeToString())
+    buf = io.StringIO()
+    with self.assertRaises(SystemExit) as err:
+      with redirect_stderr(buf):
+        self.command(['proto', '-o', FileArg('out.pb')])
+    self.assertEqual(err.exception.code, 1)
+    self.assertRegex(buf.getvalue(), r'.*out\.pb exists')
+
+
+  def test_Proto_with_append(self):
+    self.write('out.pb', LinkerConfig(provideLibs=['libfoo.so']).SerializeToString())
+    self.write('bar.json', b'{ "provideLibs": ["libbar.so"]}')
+    self.command(['proto', '-s', FileArg('bar.json'), '-o', FileArg('out.pb'), '-a'])
+    pb = LinkerConfig()
+    pb.ParseFromString(self.read('out.pb'))
+    self.assertSetEqual(set(pb.provideLibs), set(['libfoo.so', 'libbar.so']))
+
+
+  def test_Proto_with_force(self):
+    self.write('out.pb', LinkerConfig(provideLibs=['libfoo.so']).SerializeToString())
+    self.write('bar.json', b'{ "provideLibs": ["libbar.so"]}')
+    self.command(['proto', '-s', FileArg('bar.json'), '-o', FileArg('out.pb'), '-f'])
+    pb = LinkerConfig()
+    pb.ParseFromString(self.read('out.pb'))
+    self.assertSetEqual(set(pb.provideLibs), set(['libbar.so']))
+
+
   def command(self, args):
     parser = conv_linker_config.GetArgParser()
     parsed_args = parser.parse_args(self.resolve_paths(args))