Use a fake pad to make tests runnable

dungeonbattle/display/display.py

@@ -1,5 +1,7 @@
 import curses
-from typing import Any
+from typing import Any, Union
+
+from dungeonbattle.tests.screen import FakePad
 
 
 class Display:
@@ -10,3 +12,9 @@ class Display:
 
     def refresh(self) -> None:
         raise NotImplementedError
+
+    def newpad(self, height: int, width: int) -> Union[FakePad, Any]:
+        if self.screen:
+            return curses.newpad(height, width)
+        else:
+            return FakePad()

dungeonbattle/display/mapdisplay.py

@@ -16,7 +16,7 @@ class MapDisplay(Display):
         self.pack = pack
         self.map = m
         self.player = player
-        self.pad = curses.newpad(m.height, m.width + 1)
+        self.pad = self.newpad(m.height, m.width + 1)
 
     def update_pad(self) -> None:
         self.pad.addstr(0, 0, self.map.draw_string(self.pack))

dungeonbattle/display/menudisplay.py

@@ -18,12 +18,12 @@ class MenuDisplay(Display):
         self.toplefty = toplefty
 
         # Menu values are printed in pad
-        self.pad = curses.newpad(self.trueheight, self.truewidth + 1)
+        self.pad = self.newpad(self.trueheight, self.truewidth + 1)
         for i in range(self.trueheight):
             self.pad.addstr(i, 0, " " + self.values[i].value)
 
         # Menu box
-        self.menubox = curses.newpad(self.height, self.width)
+        self.menubox = self.newpad(self.height, self.width)
         self.menubox.addstr(0, 0, "┏" + "━" * (self.width - 2) + "┓")
         for i in range(1, self.height - 2):
             self.menubox.addstr(i, 0, "┃" + " " * (self.width - 2) + "┃")

dungeonbattle/display/statsdisplay.py

@@ -14,7 +14,7 @@ class StatsDisplay(Display):
         self.topleftx = topleftx
         self.toplefty = toplefty
         self.player = player
-        self.pad = curses.newpad(height, width)
+        self.pad = self.newpad(height, width)
 
     def update_pad(self) -> None:
         string = ""

dungeonbattle/tests/screen.py

@@ -0,0 +1,14 @@
+class FakePad:
+    """
+    In order to run tests, we simulate a fake curses pad that accepts functions
+    but does nothing with them.
+    """
+    def addstr(self, y: int, x: int, message: str) -> None:
+        pass
+
+    def refresh(self, pminrow: int, pmincol: int, sminrow: int,
+                smincol: int, smaxrow: int, smaxcol: int) -> None:
+        pass
+
+    def clear(self):
+        pass