Add tests for the pygame UI's resize and font logic

tests/ui/test_pygameUserInterface.py

@@ -0,0 +1,56 @@
+import sys
+import os
+
+# Bare `ui.*`/`player.*` imports (like the factory test) so pygame is exercised
+# directly; run headless under SDL_VIDEODRIVER=dummy (set by CI / the test cmd).
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "src"))
+
+from ui.pygameUserInterface import PygameUserInterface
+from player.player import Player
+from prompt.prompt import Prompt
+from stats.stats import Stats
+from world.timeService import TimeService
+
+
+def makeUI():
+    player = Player()
+    stats = Stats()
+    timeService = TimeService(player, stats)
+    prompt = Prompt("What would you like to do?")
+    return PygameUserInterface(prompt, timeService, player)
+
+
+def test_handle_resize_clamps_below_minimum():
+    # a resize smaller than the minimum window is clamped up to the minimum
+    ui = makeUI()
+    try:
+        ui._handle_resize(100, 100)
+        assert ui.width == ui.min_width
+        assert ui.height == ui.min_height
+    finally:
+        ui.cleanup()
+
+
+def test_handle_resize_accepts_larger_window():
+    # a resize above the minimum is honored exactly
+    ui = makeUI()
+    try:
+        ui._handle_resize(1024, 768)
+        assert ui.width == 1024
+        assert ui.height == 768
+    finally:
+        ui.cleanup()
+
+
+def test_update_fonts_keeps_fonts_usable_when_tiny():
+    # even at a tiny window the min-size guard keeps the fonts renderable
+    ui = makeUI()
+    try:
+        ui.width, ui.height = 200, 150
+        ui._update_fonts()
+        for font in (ui.font_large, ui.font_medium, ui.font_small):
+            assert font is not None
+            surface = font.render("Hi", True, ui.WHITE)
+            assert surface.get_width() > 0 and surface.get_height() > 0
+    finally:
+        ui.cleanup()