Update hyperoptable strategy to use V3 interface

tests/strategy/strats/hyperoptable_strategy.py

@@ -1,13 +1,13 @@
 # pragma pylint: disable=missing-docstring, invalid-name, pointless-string-statement
 
 from pandas import DataFrame
-from strategy_test_v2 import StrategyTestV2
+from strategy_test_v3 import StrategyTestV3
 
 import freqtrade.vendor.qtpylib.indicators as qtpylib
 from freqtrade.strategy import BooleanParameter, DecimalParameter, IntParameter, RealParameter
 
 
-class HyperoptableStrategy(StrategyTestV2):
+class HyperoptableStrategy(StrategyTestV3):
     """
     Default Strategy provided by freqtrade bot.
     Please do not modify this strategy, it's  intended for internal use only.

tests/strategy/strats/hyperoptable_strategy_v2.py

@@ -0,0 +1,54 @@
+# pragma pylint: disable=missing-docstring, invalid-name, pointless-string-statement
+
+from strategy_test_v2 import StrategyTestV2
+
+from freqtrade.strategy import BooleanParameter, DecimalParameter, IntParameter, RealParameter
+
+
+class HyperoptableStrategyV2(StrategyTestV2):
+    """
+    Default Strategy provided by freqtrade bot.
+    Please do not modify this strategy, it's  intended for internal use only.
+    Please look at the SampleStrategy in the user_data/strategy directory
+    or strategy repository https://github.com/freqtrade/freqtrade-strategies
+    for samples and inspiration.
+    """
+
+    buy_params = {
+        'buy_rsi': 35,
+        # Intentionally not specified, so "default" is tested
+        # 'buy_plusdi': 0.4
+    }
+
+    sell_params = {
+        'sell_rsi': 74,
+        'sell_minusdi': 0.4
+    }
+
+    buy_plusdi = RealParameter(low=0, high=1, default=0.5, space='buy')
+    sell_rsi = IntParameter(low=50, high=100, default=70, space='sell')
+    sell_minusdi = DecimalParameter(low=0, high=1, default=0.5001, decimals=3, space='sell',
+                                    load=False)
+    protection_enabled = BooleanParameter(default=True)
+    protection_cooldown_lookback = IntParameter([0, 50], default=30)
+
+    @property
+    def protections(self):
+        prot = []
+        if self.protection_enabled.value:
+            prot.append({
+                "method": "CooldownPeriod",
+                "stop_duration_candles": self.protection_cooldown_lookback.value
+            })
+        return prot
+
+    bot_loop_started = False
+
+    def bot_loop_start(self):
+        self.bot_loop_started = True
+
+    def bot_start(self, **kwargs) -> None:
+        """
+        Parameters can also be defined here ...
+        """
+        self.buy_rsi = IntParameter([0, 50], default=30, space='buy')