T3853:removed needless message printed with --failed-first,--last-failed and no failed tests

AUTHORS

@@ -47,6 +47,7 @@ Christian Theunert
 Christian Tismer
 Christopher Gilling
 Cyrus Maden
+Dhiren Serai
 Daniel Grana
 Daniel Hahler
 Daniel Nuri

src/_pytest/cacheprovider.py

@@ -134,15 +134,12 @@ class LFPlugin(object):
     def pytest_report_collectionfinish(self):
         if self.active:
             if not self._previously_failed_count:
-                mode = "run {} (no recorded failures)".format(
-                    self._no_failures_behavior
-                )
-            else:
-                noun = "failure" if self._previously_failed_count == 1 else "failures"
-                suffix = " first" if self.config.getoption("failedfirst") else ""
-                mode = "rerun previous {count} {noun}{suffix}".format(
-                    count=self._previously_failed_count, suffix=suffix, noun=noun
-                )
+                return None
+            noun = "failure" if self._previously_failed_count == 1 else "failures"
+            suffix = " first" if self.config.getoption("failedfirst") else ""
+            mode = "rerun previous {count} {noun}{suffix}".format(
+                count=self._previously_failed_count, suffix=suffix, noun=noun
+            )
             return "run-last-failure: %s" % mode
 
     def pytest_runtest_logreport(self, report):

testing/test_cacheprovider.py

@@ -414,13 +414,7 @@ class TestLastFailed(object):
         )
 
         result = testdir.runpytest(test_a, "--lf")
-        result.stdout.fnmatch_lines(
-            [
-                "collected 2 items",
-                "run-last-failure: run all (no recorded failures)",
-                "*2 passed in*",
-            ]
-        )
+        result.stdout.fnmatch_lines(["collected 2 items", "*2 passed in*"])
 
         result = testdir.runpytest(test_b, "--lf")
         result.stdout.fnmatch_lines(
@@ -617,6 +611,17 @@ class TestLastFailed(object):
         assert self.get_cached_last_failed(testdir) == []
         assert result.ret == 0
 
+    @pytest.mark.parametrize("quiet", [True, False])
+    @pytest.mark.parametrize("opt", ["--ff", "--lf"])
+    def test_lf_and_ff_prints_no_needless_message(self, quiet, opt, testdir):
+        # Issue 3853
+        testdir.makepyfile("def test(): pass")
+        args = [opt]
+        if quiet:
+            args.append("-q")
+        result = testdir.runpytest(*args)
+        assert "run all" not in result.stdout.str()
+
     def get_cached_last_failed(self, testdir):
         config = testdir.parseconfigure()
         return sorted(config.cache.get("cache/lastfailed", {}))