feat: Add dummy game utility and enhance testing capabilities

- also improve argument handling

tests/test_interactive.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+
+GSPLASH="./build/gsplash"
+DUMMY="./build/dummy_game"
+
+if [ ! -f "$GSPLASH" ] || [ ! -f "$DUMMY" ]; then
+    echo "Please run 'make' first to build gsplash and dummy_game."
+    exit 1
+fi
+
+if [ -z "$1" ]; then
+    echo "Usage: $0 <path_to_test_image_or_video>"
+    exit 1
+fi
+
+IMAGE="$1"
+if [ ! -f "$IMAGE" ]; then
+    echo "Error: File '$IMAGE' not found."
+    exit 1
+fi
+
+echo "=== Interactive gsplash Visual Test ==="
+echo "This will physically display the splash screen using different modes."
+echo "You will be asked to confirm if it looked correct after each test."
+echo ""
+
+pass=0
+fail=0
+
+run_interactive_test() {
+    local mode="$1"
+    
+    echo "------------------------------------------------"
+    echo "Testing mode: $mode"
+    echo "Launching in 2 seconds (it will stay open for 3 seconds)..."
+    sleep 2
+    
+    # Run gsplash with a 3-second dummy game
+    $GSPLASH --mode="$mode" "$IMAGE" "$DUMMY" 3
+    
+    # Prompt the user interactively
+    while true; do
+        read -p "Did it display correctly for mode '$mode'? [y/N] " response
+        case "$response" in
+            [yY][eE][sS]|[yY])
+                echo "=> PASS recorded."
+                pass=$((pass+1))
+                break
+                ;;
+            [nN][oO]|[nN]|"")
+                echo "=> FAIL recorded."
+                fail=$((fail+1))
+                break
+                ;;
+            *)
+                echo "Please answer y or n."
+                ;;
+        esac
+    done
+}
+
+run_interactive_test "stretch"
+run_interactive_test "center"
+run_interactive_test "crop"
+
+echo "================================================"
+echo "Interactive Testing Complete!"
+echo "Passed: $pass"
+echo "Failed: $fail"