* now showing pytest warnings summary by default.

* added ``--disable-pytest-warnings` flag to let users disable the warnings summary.
* extended/changed unit tests for the changes in the pytest core.

testing/test_config.py

@@ -519,7 +519,7 @@ class TestWarning:
         """)
         result = testdir.runpytest()
         assert result.parseoutcomes()["pytest-warnings"] > 0
-        assert "hello" not in result.stdout.str()
+        assert "hello" in result.stdout.str()
 
         result = testdir.runpytest("-rw")
         result.stdout.fnmatch_lines("""

testing/test_terminal.py

@@ -591,6 +591,7 @@ def test_getreportopt():
     class config:
         class option:
             reportchars = ""
+            disablepytestwarnings = True
     config.option.report = "xfailed"
     assert getreportopt(config) == "x"
 
@@ -601,12 +602,21 @@ def test_getreportopt():
     assert getreportopt(config) == "sx"
 
     config.option.report = "skipped"
-    config.option.reportchars = "sf"
+    config.option.reportchars = "sfw"
     assert getreportopt(config) == "sf"
 
-    config.option.reportchars = "sfx"
+    config.option.reportchars = "sfxw"
     assert getreportopt(config) == "sfx"
 
+    config.option.reportchars = "sfx"
+    config.option.disablepytestwarnings = False
+    assert getreportopt(config) == "sfxw"
+
+    config.option.reportchars = "sfxw"
+    config.option.disablepytestwarnings = False 
+    assert getreportopt(config) == "sfxw"
+
+
 def test_terminalreporter_reportopt_addopts(testdir):
     testdir.makeini("[pytest]\naddopts=-rs")
     testdir.makepyfile("""