unittests: add underscore prefix tests

Tests the two new detection methods for the underscore prefix
against what is detected in the binary. Contrary to the in-the-wild
failures, we can trust the binary here as we do not get any additional
flags that influence the binary contents in this test environment.

1 files changed, 37 insertions, 0 deletions

diff --git a/unittests/allplatformstests.py b/unittests/allplatformstests.py
index 8a7fcd7..25d6305 100644
--- a/unittests/allplatformstests.py
+++ b/unittests/allplatformstests.py
@@ -1546,6 +1546,43 @@ class AllPlatformTests(BasePlatformTests):
             self.build()
             self.run_tests()
 
+    def get_convincing_fake_env_and_cc(self) -> None:
+        '''
+        Return a fake env and C compiler with the fake env
+        machine info properly detected using that compiler.
+        '''
+        env = get_fake_env('', self.builddir, self.prefix)
+        cc = detect_c_compiler(env, MachineChoice.HOST)
+        # Detect machine info
+        env.machines.host = mesonbuild.environment.detect_machine_info({'c':cc})
+        return (env, cc)
+
+    def test_underscore_prefix_detection_list(self) -> None:
+        '''
+        Test the underscore detection hardcoded lookup list
+        against what was detected in the binary.
+        '''
+        env, cc = self.get_convincing_fake_env_and_cc()
+        expected_uscore = cc._symbols_have_underscore_prefix_searchbin(env)
+        list_uscore = cc._symbols_have_underscore_prefix_list(env)
+        if list_uscore is not None:
+            self.assertEqual(list_uscore, expected_uscore)
+        else:
+            raise SkipTest('No match in underscore prefix list for this platform.')
+
+    def test_underscore_prefix_detection_define(self) -> None:
+        '''
+        Test the underscore detection based on compiler-defined preprocessor macro
+        against what was detected in the binary.
+        '''
+        env, cc = self.get_convincing_fake_env_and_cc()
+        expected_uscore = cc._symbols_have_underscore_prefix_searchbin(env)
+        define_uscore = cc._symbols_have_underscore_prefix_define(env)
+        if define_uscore is not None:
+            self.assertEqual(define_uscore, expected_uscore)
+        else:
+            raise SkipTest('Did not find the underscore prefix define __USER_LABEL_PREFIX__')
+
     @skipIfNoPkgconfig
     def test_pkgconfig_static(self):
         '''