From 284d39930fc6b94912cdb4d45bc8e8df7307feb0 Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Sun, 30 Aug 2020 10:07:28 +0200
Subject: [PATCH 1/2] Allow using pairlists through dataprovider in backtesting

---
 freqtrade/data/dataprovider.py    | 6 ++++++
 freqtrade/optimize/backtesting.py | 1 +
 2 files changed, 7 insertions(+)

diff --git a/freqtrade/data/dataprovider.py b/freqtrade/data/dataprovider.py
index 3b4de823f..ccb6cbf56 100644
--- a/freqtrade/data/dataprovider.py
+++ b/freqtrade/data/dataprovider.py
@@ -39,6 +39,12 @@ class DataProvider:
         """
         self.__cached_pairs[(pair, timeframe)] = (dataframe, Arrow.utcnow().datetime)
 
+    def add_pairlisthandler(self, pairlists) -> None:
+        """
+        Allow adding pairlisthandler after initialization
+        """
+        self._pairlists = pairlists
+
     def refresh(self,
                 pairlist: ListPairsWithTimeframes,
                 helping_pairs: ListPairsWithTimeframes = None) -> None:
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 3bd75f61a..005ec9fb8 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -96,6 +96,7 @@ class Backtesting:
                 "PrecisionFilter not allowed for backtesting multiple strategies."
             )
 
+        dataprovider.add_pairlisthandler(self.pairlists)
         self.pairlists.refresh_pairlist()
 
         if len(self.pairlists.whitelist) == 0:

From 842eff95eba81ddaa34e71ac1d4082ed163d6630 Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Sun, 30 Aug 2020 10:07:58 +0200
Subject: [PATCH 2/2] Add simple verification to ensure pairlists is iitialized

---
 tests/optimize/test_backtesting.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/optimize/test_backtesting.py b/tests/optimize/test_backtesting.py
index 52d8f217c..f5c313520 100644
--- a/tests/optimize/test_backtesting.py
+++ b/tests/optimize/test_backtesting.py
@@ -359,6 +359,7 @@ def test_backtesting_start(default_conf, mocker, testdatadir, caplog) -> None:
     ]
     for line in exists:
         assert log_has(line, caplog)
+    assert backtesting.strategy.dp._pairlists is not None
 
 
 def test_backtesting_start_no_data(default_conf, mocker, caplog, testdatadir) -> None: