Index: binaries/data/mods/public/simulation/components/Formation.js
===================================================================
--- binaries/data/mods/public/simulation/components/Formation.js
+++ binaries/data/mods/public/simulation/components/Formation.js
@@ -892,7 +892,7 @@
 
 Formation.prototype.AreAnglesSimilar = function(a1, a2)
 {
-	const d = Math.abs(a1 - a2) % 2 * Math.PI;
+	const d = Math.abs(a1 - a2) % (2 * Math.PI);
 	return d < this.maxTurningAngle || d > 2 * Math.PI - this.maxTurningAngle;
 };
 
Index: binaries/data/mods/public/simulation/components/tests/test_Formation.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/simulation/components/tests/test_Formation.js
@@ -0,0 +1,41 @@
+Engine.LoadComponentScript("interfaces/Timer.js");
+Engine.LoadComponentScript("interfaces/Formation.js");
+Engine.LoadComponentScript("Formation.js");
+
+const entity_id = 5;
+
+const formationTemplate = {
+	"RequiredMemberCount" : 2,
+	"DisabledTooltip": "",
+	"SpeedMultiplier": 1,
+	"FormationShape": "square",
+	"MaxTurningAngle": 0,
+	"SortingClasses": "Hero Champion Cavalry Melee Ranged",
+	"SortingOrder": "fillToTheCenter",
+	"ShiftRows": false,
+	"UnitSeparationWidthMultiplier": 1,
+	"UnitSeparationDepthMultiplier": 1,
+	"WidthDepthRatio": 1,
+	"Sloppiness": 0
+};
+
+AddMock(SYSTEM_ENTITY, IID_Timer, {
+	"SetInterval": function() {},
+	"SetTimeout": function() {},
+});
+
+const cmpFormation = ConstructComponent(entity_id, "Formation", formationTemplate);
+
+const testingAngles = [];
+
+for (let i = 0; i < 179; i++) {
+	testingAngles.push(i * Math.PI / 180);
+}
+
+TS_ASSERT_EQUALS(testingAngles.every(x => cmpFormation.AreAnglesSimilar(0, x)), false);
+TS_ASSERT_EQUALS(testingAngles.every(x => cmpFormation.AreAnglesSimilar(0, -x)), false);
+
+cmpFormation.maxTurningAngle = Math.PI;
+
+TS_ASSERT_EQUALS(testingAngles.every(x => cmpFormation.AreAnglesSimilar(0, x)), true);
+TS_ASSERT_EQUALS(testingAngles.every(x => cmpFormation.AreAnglesSimilar(0, -x)), true);