[lldb][NFC] Refactor TestSafeFuncCalls.py

Summary:
This patch inlines all the single-line functions that we only use once in the test
and replaces the assertTrue with an assertEquals to improve the error message
when this test fails.

Reviewers: JDevlieghere

Reviewed By: JDevlieghere

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D75497

lldb/test/API/macosx/safe-to-func-call/TestSafeFuncCalls.py

@@ -12,12 +12,6 @@ class TestSafeFuncCalls(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
-    def setUp(self):
-        # Call super's setUp().
-        TestBase.setUp(self)
-        # Find the line numbers that we will step to in main:
-        self.main_source = "main.c"
-
     @skipUnlessDarwin
     @add_test_categories(['pyapi'])
     def test_with_python_api(self):
@@ -27,17 +21,18 @@ def test_with_python_api(self):
 
         target = self.dbg.CreateTarget(exe)
         self.assertTrue(target, VALID_TARGET)
-        self.main_source_spec = lldb.SBFileSpec(self.main_source)
+        self.main_source_spec = lldb.SBFileSpec("main.c")
         break1 = target.BreakpointCreateByName("stopper", 'a.out')
         self.assertTrue(break1, VALID_BREAKPOINT)
         process = target.LaunchSimple(
             None, None, self.get_process_working_directory())
         self.assertTrue(process, PROCESS_IS_VALID)
         threads = lldbutil.get_threads_stopped_at_breakpoint(process, break1)
-        if len(threads) != 1:
-            self.fail("Failed to stop at breakpoint 1.")
+        self.assertEqual(len(threads), 1, "Failed to stop at breakpoint 1.")
 
-        self.check_number_of_threads(process)
+        self.assertEqual(
+            process.GetNumThreads(), 2,
+            "Check that the process has two threads when sitting at the stopper() breakpoint")
 
         main_thread = lldb.SBThread()
         select_thread = lldb.SBThread()
@@ -52,19 +47,8 @@ def test_with_python_api(self):
             main_thread.IsValid() and select_thread.IsValid(),
             "Got both expected threads")
 
-        self.safe_to_call_func_on_main_thread(main_thread)
-        self.safe_to_call_func_on_select_thread(select_thread)
-
-    def check_number_of_threads(self, process):
-        self.assertTrue(
-            process.GetNumThreads() == 2,
-            "Check that the process has two threads when sitting at the stopper() breakpoint")
-
-    def safe_to_call_func_on_main_thread(self, main_thread):
         self.assertTrue(main_thread.SafeToCallFunctions(),
                         "It is safe to call functions on the main thread")
-
-    def safe_to_call_func_on_select_thread(self, select_thread):
         self.assertTrue(
             select_thread.SafeToCallFunctions() == False,
             "It is not safe to call functions on the select thread")