1 files changed, 64 insertions, 0 deletions
diff --git a/integration_test.go b/integration_test.go
new file mode 100644
index 0000000..8305719
--- /dev/null
+++ b/integration_test.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"testing"
+	"time"
+
+	"age_of_empires/physics"
+)
+
+func TestGatherLoop(t *testing.T) {
+	// Initialize Game
+	game := &Game{}
+
+	// Town Center (Storage) at -100,0 (different grid cell from unit at 0,0)
+	tcBuilder := NewEntityBuilder().
+		WithPosition(physics.Point{X: -100, Y: 0}).
+		WithResourceStorage()
+	_ = game.Append(tcBuilder.Build())
+
+	// Mine (Source) at 0, 200
+	mineBuilder := NewEntityBuilder().
+		WithPosition(physics.Point{X: 0, Y: 200}).
+		WithResourceSource(100)
+	mineID := game.Append(mineBuilder.Build())
+
+	// Unit (Gatherer) at 0, 0
+	unitBuilder := NewEntityBuilder().
+		WithPosition(physics.Point{X: 0, Y: 0}).
+		WithMove().
+		WithOrder().
+		WithResourceGatherer(10)
+	unitID := game.Append(unitBuilder.Build())
+
+	// Set up simulated time
+	simTime := time.Now()
+	game.NowFunc = func() time.Time { return simTime }
+
+	// Simulate user selection: select the unit
+	game.GlobalSelection.Selected = append(game.GlobalSelection.Selected, unitID)
+
+	// Simulate right-click on mine position to trigger Gather via MainAction
+	minePosition := game.Position[mineID]
+	MainAction(game, unitID, minePosition, game.getMoveMap())
+
+	initialResources := game.ResourceAmount
+	dt := 16 * time.Millisecond
+	maxTicks := 100_000
+
+	deposited := false
+
+	for i := 0; i < maxTicks; i++ {
+		simTime = simTime.Add(dt)
+		game.Update()
+
+		if game.ResourceAmount > initialResources {
+			deposited = true
+			break
+		}
+	}
+
+	if !deposited {
+		t.Errorf("Unit failed to gather resources within %d ticks. ResourceAmount: %d", maxTicks, game.ResourceAmount)
+	}
+}