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diff --git a/js/baba-yaga/test-js-interop.baba b/js/baba-yaga/test-js-interop.baba
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+// test-js-interop.baba - Test JavaScript interop functionality
+
+// Test 1: Basic Math.abs call
+io.out "=== Test 1: Math.abs ===" ;
+
+absResult : io.callJS "Math.abs" [-42];
+io.out "Math.abs(-42) result:";
+io.out absResult;
+
+// Test 2: JSON parsing
+io.out "=== Test 2: JSON Parsing ===" ;
+
+jsonStr : "{\"name\": \"Alice\", \"age\": 30, \"active\": true}";
+parseResult : io.callJS "JSON.parse" [jsonStr];
+
+io.out "JSON.parse result:";
+io.out parseResult;
+
+// Test 3: Property access
+io.out "=== Test 3: Property Access ===" ;
+
+nameResult : when parseResult is
+  Ok obj then io.getProperty obj "name"
+  Err msg then Err msg;
+
+io.out "Name property:";
+io.out nameResult;
+
+// Test 4: Array conversion
+io.out "=== Test 4: Array Conversion ===" ;
+
+babaList : [1, 2, 3, 4, 5];
+jsArray : io.listToJSArray babaList;
+stringifyResult : io.callJS "JSON.stringify" [jsArray];
+
+io.out "List to JS array to JSON:";
+io.out stringifyResult;
+
+// Test 5: Table to Object conversion
+io.out "=== Test 5: Table to Object ===" ;
+
+babaTable : {x: 100, y: 200, label: "point"};
+jsObject : io.tableToObject babaTable;
+tableJsonResult : io.callJS "JSON.stringify" [jsObject];
+
+io.out "Table to JS object to JSON:";
+io.out tableJsonResult;
+
+// Test 6: Round-trip conversion
+io.out "=== Test 6: Round-trip Conversion ===" ;
+
+originalData : {
+  users: ["Alice", "Bob", "Charlie"],
+  count: 3,
+  active: true
+};
+
+// Convert to JS object
+jsObj : io.tableToObject originalData;
+
+// Convert to JSON string
+jsonResult : io.callJS "JSON.stringify" [jsObj];
+
+// Parse back to JS object
+parseBackResult : when jsonResult is
+  Ok jsonStr then io.callJS "JSON.parse" [jsonStr]
+  Err msg then Err msg;
+
+// Convert back to Baba Yaga table
+finalResult : when parseBackResult is
+  Ok jsObj then io.objectToTable jsObj
+  Err msg then Err msg;
+
+io.out "Round-trip result:";
+io.out finalResult;
+
+// Test 7: Error handling
+io.out "=== Test 7: Error Handling ===" ;
+
+errorResult : io.callJS "nonExistentFunction" [42];
+io.out "Error result (should be Err):";
+io.out errorResult;
+
+// Test 8: Property existence check
+io.out "=== Test 8: Property Existence ===" ;
+
+testObj : io.callJS "JSON.parse" ["{\"existing\": true}"];
+hasExisting : when testObj is
+  Ok obj then io.hasProperty obj "existing"
+  Err _ then false;
+
+hasMissing : when testObj is
+  Ok obj then io.hasProperty obj "missing"
+  Err _ then false;
+
+io.out "Has 'existing' property:";
+io.out hasExisting;
+io.out "Has 'missing' property:";
+io.out hasMissing;
+
+io.out "=== All Tests Complete ===";