make should_short and go_short optional

jesse/strategies/Strategy.py

@@ -383,7 +383,6 @@ class Strategy(ABC):
     def go_long(self) -> None:
         pass
 
-    @abstractmethod
     def go_short(self) -> None:
         pass
 
@@ -432,13 +431,10 @@ class Strategy(ABC):
 
     @abstractmethod
     def should_long(self) -> bool:
-        """are all filters good to execute buy"""
         pass
 
-    @abstractmethod
     def should_short(self) -> bool:
-        """are all filters good to execute sell"""
-        pass
+        return False
 
     @abstractmethod
     def should_cancel(self) -> bool:

jesse/strategies/TestCanRunWithoutShorting/__init__.py

@@ -0,0 +1,12 @@
+from jesse.strategies import Strategy
+
+
+class TestCanRunWithoutShorting(Strategy):
+    def should_long(self):
+        return False
+
+    def should_cancel(self):
+        return False
+
+    def go_long(self):
+        pass

tests/test_parent_strategy.py

@@ -874,6 +874,10 @@ def test_stop_loss_price_is_replaced_with_market_order():
 
 def test_take_profit_price_is_replaced_with_market_order():
     # long position
-    single_route_backtest('TestTakeProfitPriceIsReplacedWithMarketOrderWhenMoreConvenientLongPosition')
+    single_route_backtest('TestTakeProfitPriceIsReplacedWithMarketOrderWhenMoreConvenientLongPTestCanRunWithoutShortingsition')
     # # short position
     single_route_backtest('TestTakeProfitPriceIsReplacedWithMarketOrderWhenMoreConvenientShortPosition')
+
+
+def test_can_run_without_shorting():
+    single_route_backtest('TestCanRunWithoutShorting')