diff --git a/tests/11_geospatial/test.js b/tests/11_geospatial/test.js
new file mode 100644
index 0000000..be29475
--- /dev/null
+++ b/tests/11_geospatial/test.js
@@ -0,0 +1,26 @@
+export default{
+  functionName:'analyzeGPS',
+  prompt:`// Write an async function 'analyzeGPS' that processes GPS data using @turf/turf.
+// - Input: 'readings' array [{ts: number, loc: [lon, lat]}], 'boundary' (GeoJSON Polygon).
+// - You MUST use dynamic import() to load @turf/turf from a CDN.
+// - Filter 'readings' to keep only those where 'loc' is strictly inside 'boundary'.
+// - Sort the valid readings by 'ts' ascending.
+// - Create a LineString from the sorted locations.
+// - Calculate the total length of the path in kilometers using turf.length.
+// - Return the length rounded to 2 decimal places (number). Return 0 if < 2 points.`,
+  runTest:async(fn)=>{
+    const assert=(c,m)=>{if(!c)throw new Error(m)};
+    const poly={type:'Polygon',coordinates:[[[0,0],[0,2],[2,2],[2,0],[0,0]]]};
+    const pts=[
+      {ts:1,loc:[1,0.5]},
+      {ts:3,loc:[1,1.5]}, // Dist from (1,0.5) to (1,1.5) is ~111km
+      {ts:2,loc:[3,3]}    // Outside
+    ];
+    const res=await fn(pts,poly);
+    assert(typeof res==='number','Result should be a number');
+    // 1 deg lat is approx 111.32km
+    assert(res>110&&res<112,`Expected ~111.32km, got ${res}`);
+    const empty=await fn([],poly);
+    assert(empty===0,'Should return 0 for empty input');
+  }
+};