Propagate timestamps from CallInfo to TestReport objects

TestReport objects stored only the information about stage duration.
This is not enough to correlate pytest stages with external events.
Timestamps are already there in CallInfo. They just needed to be
propagated to TestReport objects, so that they can be read when
TestReports are exported externally (for example with --reportlog
option)

AUTHORS

@@ -297,6 +297,7 @@ Ram Rachum
 Ran Benita
 Raphael Castaneda
 Raphael Pierzina
+Rafal Semik
 Raquel Alegre
 Ravi Chandra
 Robert Holt

changelog/10710.improvement.rst

@@ -0,0 +1 @@
+Added ``start`` and ``stop`` timestamps to ``TestReport`` objects exported to --reportlog.

src/_pytest/reports.py

@@ -262,6 +262,8 @@ class TestReport(BaseReport):
         when: "Literal['setup', 'call', 'teardown']",
         sections: Iterable[Tuple[str, str]] = (),
         duration: float = 0,
+        start: float = 0,
+        stop: float = 0,
         user_properties: Optional[Iterable[Tuple[str, object]]] = None,
         **extra,
     ) -> None:
@@ -299,6 +301,11 @@ class TestReport(BaseReport):
         #: Time it took to run just the test.
         self.duration: float = duration
 
+        #: The system time when the call started, in seconds since the epoch.
+        self.start: float = start
+        #: The system time when the call ended, in seconds since the epoch.
+        self.stop: float = stop
+
         self.__dict__.update(extra)
 
     def __repr__(self) -> str:
@@ -317,6 +324,8 @@ class TestReport(BaseReport):
         # Remove "collect" from the Literal type -- only for collection calls.
         assert when != "collect"
         duration = call.duration
+        start = call.start
+        stop = call.stop
         keywords = {x: 1 for x in item.keywords}
         excinfo = call.excinfo
         sections = []
@@ -361,6 +370,8 @@ class TestReport(BaseReport):
             when,
             sections,
             duration,
+            start,
+            stop,
             user_properties=item.user_properties,
         )