Remove breakpoint support checking since all python versions support it.

Author: hramezani

testing/test_debugging.py

@@ -8,14 +8,6 @@
 from _pytest.monkeypatch import MonkeyPatch
 from _pytest.pytester import Pytester
 
-try:
-    # Type ignored for Python <= 3.6.
-    breakpoint  # type: ignore
-except NameError:
-    SUPPORTS_BREAKPOINT_BUILTIN = False
-else:
-    SUPPORTS_BREAKPOINT_BUILTIN = True
-
 
 _ENVIRON_PYTHONBREAKPOINT = os.environ.get("PYTHONBREAKPOINT", "")
 
@@ -911,13 +903,6 @@ def test_foo():
 
 
 class TestDebuggingBreakpoints:
-    def test_supports_breakpoint_module_global(self) -> None:
-        """Test that supports breakpoint global marks on Python 3.7+."""
-        assert SUPPORTS_BREAKPOINT_BUILTIN is True
-
-    @pytest.mark.skipif(
-        not SUPPORTS_BREAKPOINT_BUILTIN, reason="Requires breakpoint() builtin"
-    )
     @pytest.mark.parametrize("arg", ["--pdb", ""])
     def test_sys_breakpointhook_configure_and_unconfigure(
         self, pytester: Pytester, arg: str
@@ -951,9 +936,6 @@ def test_nothing(): pass
         result = pytester.runpytest_subprocess(*args)
         result.stdout.fnmatch_lines(["*1 passed in *"])
 
-    @pytest.mark.skipif(
-        not SUPPORTS_BREAKPOINT_BUILTIN, reason="Requires breakpoint() builtin"
-    )
     def test_pdb_custom_cls(self, pytester: Pytester, custom_debugger_hook) -> None:
         p1 = pytester.makepyfile(
             """
@@ -968,9 +950,6 @@ def test_nothing():
         assert custom_debugger_hook == ["init", "set_trace"]
 
     @pytest.mark.parametrize("arg", ["--pdb", ""])
-    @pytest.mark.skipif(
-        not SUPPORTS_BREAKPOINT_BUILTIN, reason="Requires breakpoint() builtin"
-    )
     def test_environ_custom_class(
         self, pytester: Pytester, custom_debugger_hook, arg: str
     ) -> None:
@@ -1001,9 +980,6 @@ def test_nothing(): pass
         result = pytester.runpytest_subprocess(*args)
         result.stdout.fnmatch_lines(["*1 passed in *"])
 
-    @pytest.mark.skipif(
-        not SUPPORTS_BREAKPOINT_BUILTIN, reason="Requires breakpoint() builtin"
-    )
     @pytest.mark.skipif(
         not _ENVIRON_PYTHONBREAKPOINT == "",
         reason="Requires breakpoint() default value",
@@ -1024,9 +1000,6 @@ def test_1():
         assert "reading from stdin while output" not in rest
         TestPDB.flush(child)
 
-    @pytest.mark.skipif(
-        not SUPPORTS_BREAKPOINT_BUILTIN, reason="Requires breakpoint() builtin"
-    )
     def test_pdb_not_altered(self, pytester: Pytester) -> None:
         p1 = pytester.makepyfile(
             """