Functional selftests: conditionally skip based tests that need cc

When no C compiler is available, these tests will produce errors.
Let's skip them when the requirements cannot be met.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

selftests/functional/test_basic.py

@@ -19,7 +19,7 @@ from avocado.core import exit_codes
 from avocado.utils import astring
 from avocado.utils import process
 from avocado.utils import script
-
+from avocado.utils import path as utils_path
 
 basedir = os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', '..')
 basedir = os.path.abspath(basedir)
@@ -96,6 +96,14 @@ class MyTest(Test):
 '''
 
 
+def missing_binary(binary):
+    try:
+        utils_path.find_command(binary)
+        return False
+    except utils_path.CmdNotFoundError:
+        return True
+
+
 class RunnerOperationTest(unittest.TestCase):
 
     def setUp(self):
@@ -160,6 +168,8 @@ class RunnerOperationTest(unittest.TestCase):
         self.assertEqual(result.exit_status, expected_rc,
                          "Avocado did not return rc %d:\n%s" % (expected_rc, result))
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying datadir.py test")
     def test_datadir_alias(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --sysinfo=off --job-results-dir %s '
@@ -173,6 +183,8 @@ class RunnerOperationTest(unittest.TestCase):
                     'env_variables.sh' % self.tmpdir)
         process.run(cmd_line)
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying datadir.py test")
     def test_datadir_noalias(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --sysinfo=off --job-results-dir %s examples/tests/datadir.py '

selftests/functional/test_output.py

@@ -17,6 +17,7 @@ from avocado.core import exit_codes
 from avocado.core.output import TermSupport
 from avocado.utils import process
 from avocado.utils import script
+from avocado.utils import path as utils_path
 
 basedir = os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', '..')
 basedir = os.path.abspath(basedir)
@@ -56,11 +57,21 @@ def perl_tap_parser_uncapable():
     return os.system("perl -e 'use TAP::Parser;'") != 0
 
 
+def missing_binary(binary):
+    try:
+        utils_path.find_command(binary)
+        return False
+    except utils_path.CmdNotFoundError:
+        return True
+
+
 class OutputTest(unittest.TestCase):
 
     def setUp(self):
         self.tmpdir = tempfile.mkdtemp(prefix='avocado_' + __name__)
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying doublefree.py test")
     def test_output_doublefree(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --job-results-dir %s --sysinfo=off '

selftests/functional/test_wrapper.py

@@ -11,6 +11,7 @@ else:
 from avocado.core import exit_codes
 from avocado.utils import process
 from avocado.utils import script
+from avocado.utils import path as utils_path
 
 basedir = os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', '..')
 basedir = os.path.abspath(basedir)
@@ -26,6 +27,14 @@ exec -- $@
 """
 
 
+def missing_binary(binary):
+    try:
+        utils_path.find_command(binary)
+        return False
+    except utils_path.CmdNotFoundError:
+        return True
+
+
 class WrapperTest(unittest.TestCase):
 
     def setUp(self):
@@ -42,6 +51,8 @@ class WrapperTest(unittest.TestCase):
             'avocado_wrapper_functional')
         self.dummy.save()
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying datadir.py test")
     def test_global_wrapper(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --job-results-dir %s --sysinfo=off --wrapper %s '
@@ -56,6 +67,8 @@ class WrapperTest(unittest.TestCase):
                         "%s\nCmdline: %s" %
                         (self.tmpfile, result.stdout, cmd_line))
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying datadir.py test")
     def test_process_wrapper(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --job-results-dir %s --sysinfo=off --wrapper %s:*/datadir '
@@ -70,6 +83,8 @@ class WrapperTest(unittest.TestCase):
                         "%s\nStdout: %s" %
                         (self.tmpfile, cmd_line, result.stdout))
 
+    @unittest.skipIf(missing_binary('cc'),
+                     "C compiler is required by the underlying datadir.py test")
     def test_both_wrappers(self):
         os.chdir(basedir)
         cmd_line = ('./scripts/avocado run --job-results-dir %s --sysinfo=off --wrapper %s --wrapper %s:*/datadir '