diff --git a/js/js-export/__tests__/constraints.test.js b/js/js-export/__tests__/constraints.test.js
new file mode 100644
index 0000000000..6c23238d73
--- /dev/null
+++ b/js/js-export/__tests__/constraints.test.js
@@ -0,0 +1,317 @@
+global.JSInterface = { _methodArgConstraints: {} };
+require("../constraints.js");
+
+describe('JSInterface._methodArgConstraints', () => {
+    const validateConstraints = (methodName, args) => {
+        const constraints = JSInterface._methodArgConstraints[methodName];
+        if (!constraints) {
+            throw new Error(`Method ${methodName} not found in constraints`);
+        }
+
+        args.forEach((arg, index) => {
+            const constraint = constraints[index];
+            if (!constraint) {
+                throw new Error(`Constraint for argument ${index} not found`);
+            }
+
+            if (typeof arg !== constraint.type) {
+                throw new Error(`Argument ${index} is not of type ${constraint.type}`);
+            }
+
+            if (constraint.constraints) {
+                if (constraint.constraints.min !== undefined && arg < constraint.constraints.min) {
+                    throw new Error(`Argument ${index} is less than the minimum value ${constraint.constraints.min}`);
+                }
+                if (constraint.constraints.max !== undefined && arg > constraint.constraints.max) {
+                    throw new Error(`Argument ${index} is greater than the maximum value ${constraint.constraints.max}`);
+                }
+                if (constraint.constraints.integer !== undefined && constraint.constraints.integer && !Number.isInteger(arg)) {
+                    throw new Error(`Argument ${index} is not an integer`);
+                }
+                if (constraint.constraints.async !== undefined && constraint.constraints.async && typeof arg !== 'function') {
+                    throw new Error(`Argument ${index} is not an async function`);
+                }
+                if (constraint.constraints.type === 'solfegeorletter' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid solfege or letter`);
+                }
+                if (constraint.constraints.type === 'accidental' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid accidental`);
+                }
+                if (constraint.constraints.type === 'synth' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid synth`);
+                }
+                if (constraint.constraints.type === 'drum' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid drum`);
+                }
+                if (constraint.constraints.type === 'noise' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid noise`);
+                }
+                if (constraint.constraints.type === 'letterkey' && typeof arg !== 'string') {
+                    throw new Error(`Argument ${index} is not a valid letter key`);
+                }
+                if (constraint.constraints.type === 'oneof' && !constraint.constraints.values.includes(arg)) {
+                    throw new Error(`Argument ${index} is not one of the allowed values`);
+                }
+            }
+        });
+    };
+
+    it('should validate setMeter arguments', () => {
+        expect(() => validateConstraints('setMeter', [8, 500])).not.toThrow();
+        expect(() => validateConstraints('setMeter', [0, 500])).toThrow();
+        expect(() => validateConstraints('setMeter', [17, 500])).toThrow();
+        expect(() => validateConstraints('setMeter', [8, -1])).toThrow();
+    });
+
+    it('should validate PICKUP arguments', () => {
+        expect(() => validateConstraints('PICKUP', [500])).not.toThrow();
+        expect(() => validateConstraints('PICKUP', [-1])).toThrow();
+        expect(() => validateConstraints('PICKUP', [1001])).toThrow();
+    });
+
+    it('should validate setBPM arguments', () => {
+        expect(() => validateConstraints('setBPM', [120, 5])).not.toThrow();
+        expect(() => validateConstraints('setBPM', [39, 5])).toThrow();
+        expect(() => validateConstraints('setBPM', [209, 5])).toThrow();
+        expect(() => validateConstraints('setBPM', [120, -1])).toThrow();
+    });
+
+    it('should validate setMasterBPM arguments', () => {
+        expect(() => validateConstraints('setMasterBPM', [120, 5])).not.toThrow();
+        expect(() => validateConstraints('setMasterBPM', [39, 5])).toThrow();
+        expect(() => validateConstraints('setMasterBPM', [209, 5])).toThrow();
+        expect(() => validateConstraints('setMasterBPM', [120, -1])).toThrow();
+    });
+
+    it('should validate onEveryNoteDo arguments', () => {
+        expect(() => validateConstraints('onEveryNoteDo', ["action"])).not.toThrow();
+        expect(() => validateConstraints('onEveryNoteDo', [123])).toThrow();
+    });
+
+    it('should validate onEveryBeatDo arguments', () => {
+        expect(() => validateConstraints('onEveryBeatDo', ["action"])).not.toThrow();
+        expect(() => validateConstraints('onEveryBeatDo', [123])).toThrow();
+    });
+
+    it('should validate onStrongBeatDo arguments', () => {
+        expect(() => validateConstraints('onStrongBeatDo', [8, "action"])).not.toThrow();
+        expect(() => validateConstraints('onStrongBeatDo', [0, "action"])).toThrow();
+        expect(() => validateConstraints('onStrongBeatDo', [17, "action"])).toThrow();
+        expect(() => validateConstraints('onStrongBeatDo', [8, 123])).toThrow();
+    });
+
+    it('should validate onWeakBeatDo arguments', () => {
+        expect(() => validateConstraints('onWeakBeatDo', ["action"])).not.toThrow();
+        expect(() => validateConstraints('onWeakBeatDo', [123])).toThrow();
+    });
+
+    it('should validate getNotesPlayed arguments', () => {
+        expect(() => validateConstraints('getNotesPlayed', [500])).not.toThrow();
+        expect(() => validateConstraints('getNotesPlayed', [-1])).toThrow();
+        expect(() => validateConstraints('getNotesPlayed', [1001])).toThrow();
+    });
+
+    it('should validate playPitch arguments', () => {
+        expect(() => validateConstraints('playPitch', ["action", 4])).not.toThrow();
+        expect(() => validateConstraints('playPitch', [123, 4])).toThrow();
+        expect(() => validateConstraints('playPitch', ["action", 0])).toThrow();
+    });
+
+    it('should validate stepPitch arguments', () => {
+        expect(() => validateConstraints('stepPitch', [3])).not.toThrow();
+        expect(() => validateConstraints('stepPitch', [-8])).toThrow();
+        expect(() => validateConstraints('stepPitch', [8])).toThrow();
+    });
+
+    it('should validate playNthModalPitch arguments', () => {
+        expect(() => validateConstraints('playNthModalPitch', [3, 4])).not.toThrow();
+        expect(() => validateConstraints('playNthModalPitch', [-8, 4])).toThrow();
+        expect(() => validateConstraints('playNthModalPitch', [8, 4])).toThrow();
+        expect(() => validateConstraints('playNthModalPitch', [3, 0])).toThrow();
+    });
+
+    it('should validate playPitchNumber arguments', () => {
+        expect(() => validateConstraints('playPitchNumber', [5])).not.toThrow();
+        expect(() => validateConstraints('playPitchNumber', [-4])).toThrow();
+        expect(() => validateConstraints('playPitchNumber', [13])).toThrow();
+    });
+
+    it('should validate playHertz arguments', () => {
+        expect(() => validateConstraints('playHertz', [440])).not.toThrow();
+        expect(() => validateConstraints('playHertz', [19])).toThrow();
+        expect(() => validateConstraints('playHertz', [20001])).toThrow();
+    });
+
+    it('should validate setRegister arguments', () => {
+        expect(() => validateConstraints('setRegister', [2])).not.toThrow();
+        expect(() => validateConstraints('setRegister', [-4])).toThrow();
+        expect(() => validateConstraints('setRegister', [4])).toThrow();
+    });
+
+    it('should validate invert arguments', () => {
+        expect(() => validateConstraints('invert', ['C', 4, 'even'])).not.toThrow();
+        expect(() => validateConstraints('invert', [123, 4, 'even'])).toThrow();
+        expect(() => validateConstraints('invert', ['C', 0, 'even'])).toThrow();
+        expect(() => validateConstraints('invert', ['C', 4, 'invalid'])).toThrow();
+    });
+
+    it('should validate setPitchNumberOffset arguments', () => {
+        expect(() => validateConstraints('setPitchNumberOffset', ['C', 4])).not.toThrow();
+        expect(() => validateConstraints('setPitchNumberOffset', [123, 4])).toThrow();
+        expect(() => validateConstraints('setPitchNumberOffset', ['C', 0])).toThrow();
+    });
+
+    it('should validate numToPitch arguments', () => {
+        expect(() => validateConstraints('numToPitch', [50])).not.toThrow();
+        expect(() => validateConstraints('numToPitch', [-1])).toThrow();
+        expect(() => validateConstraints('numToPitch', [101])).toThrow();
+    });
+
+    it('should validate numToOctave arguments', () => {
+        expect(() => validateConstraints('numToOctave', [50])).not.toThrow();
+        expect(() => validateConstraints('numToOctave', [-1])).toThrow();
+        expect(() => validateConstraints('numToOctave', [101])).toThrow();
+    });
+
+    it('should validate setKey arguments', () => {
+        expect(() => validateConstraints('setKey', ['C', 'major'])).not.toThrow();
+        expect(() => validateConstraints('setKey', [123, 'major'])).toThrow();
+        expect(() => validateConstraints('setKey', ['C', 'invalid'])).toThrow();
+    });
+
+    it('should validate MOVABLEDO arguments', () => {
+        expect(() => validateConstraints('MOVABLEDO', [true])).not.toThrow();
+        expect(() => validateConstraints('MOVABLEDO', [false])).not.toThrow();
+        expect(() => validateConstraints('MOVABLEDO', [123])).toThrow();
+    });
+
+    it('should validate PANNING arguments', () => {
+        expect(() => validateConstraints('PANNING', [50])).not.toThrow();
+        expect(() => validateConstraints('PANNING', [-101])).toThrow();
+        expect(() => validateConstraints('PANNING', [101])).toThrow();
+    });
+
+    it('should validate MASTERVOLUME arguments', () => {
+        expect(() => validateConstraints('MASTERVOLUME', [50])).not.toThrow();
+        expect(() => validateConstraints('MASTERVOLUME', [-1])).toThrow();
+        expect(() => validateConstraints('MASTERVOLUME', [101])).toThrow();
+    });
+
+    it('should validate setSynthVolume arguments', () => {
+        expect(() => validateConstraints('setSynthVolume', ['synth', 50])).not.toThrow();
+        expect(() => validateConstraints('setSynthVolume', [123, 50])).toThrow();
+        expect(() => validateConstraints('setSynthVolume', ['synth', -1])).toThrow();
+    });
+
+    it('should validate getSynthVolume arguments', () => {
+        expect(() => validateConstraints('getSynthVolume', ['synth'])).not.toThrow();
+        expect(() => validateConstraints('getSynthVolume', [123])).toThrow();
+    });
+
+    it('should validate playDrum arguments', () => {
+        expect(() => validateConstraints('playDrum', ['drum'])).not.toThrow();
+        expect(() => validateConstraints('playDrum', [123])).toThrow();
+    });
+
+    it('should validate playNoise arguments', () => {
+        expect(() => validateConstraints('playNoise', ['noise'])).not.toThrow();
+        expect(() => validateConstraints('playNoise', [123])).toThrow();
+    });
+
+    it('should validate goForward arguments', () => {
+        expect(() => validateConstraints('goForward', [50000])).not.toThrow();
+        expect(() => validateConstraints('goForward', [-100001])).toThrow();
+        expect(() => validateConstraints('goForward', [100001])).toThrow();
+    });
+
+    it('should validate goBackward arguments', () => {
+        expect(() => validateConstraints('goBackward', [50000])).not.toThrow();
+        expect(() => validateConstraints('goBackward', [-100001])).toThrow();
+        expect(() => validateConstraints('goBackward', [100001])).toThrow();
+    });
+
+    it('should validate turnRight arguments', () => {
+        expect(() => validateConstraints('turnRight', [180])).not.toThrow();
+        expect(() => validateConstraints('turnRight', [-361])).toThrow();
+        expect(() => validateConstraints('turnRight', [361])).toThrow();
+    });
+
+    it('should validate turnLeft arguments', () => {
+        expect(() => validateConstraints('turnLeft', [180])).not.toThrow();
+        expect(() => validateConstraints('turnLeft', [-361])).toThrow();
+        expect(() => validateConstraints('turnLeft', [361])).toThrow();
+    });
+
+    it('should validate setXY arguments', () => {
+        expect(() => validateConstraints('setXY', [50000, 50000])).not.toThrow();
+        expect(() => validateConstraints('setXY', [-100001, 50000])).toThrow();
+        expect(() => validateConstraints('setXY', [100001, 50000])).toThrow();
+    });
+
+    it('should validate setHeading arguments', () => {
+        expect(() => validateConstraints('setHeading', [180])).not.toThrow();
+        expect(() => validateConstraints('setHeading', [-361])).toThrow();
+        expect(() => validateConstraints('setHeading', [361])).toThrow();
+    });
+
+    it('should validate drawArc arguments', () => {
+        expect(() => validateConstraints('drawArc', [180, 50000])).not.toThrow();
+        expect(() => validateConstraints('drawArc', [-361, 50000])).toThrow();
+        expect(() => validateConstraints('drawArc', [361, 50000])).toThrow();
+        expect(() => validateConstraints('drawArc', [180, -1])).toThrow();
+    });
+
+    it('should validate drawBezier arguments', () => {
+        expect(() => validateConstraints('drawBezier', [50000, 50000])).not.toThrow();
+        expect(() => validateConstraints('drawBezier', [-100001, 50000])).toThrow();
+        expect(() => validateConstraints('drawBezier', [100001, 50000])).toThrow();
+    });
+
+    it('should validate setBezierControlPoint1 arguments', () => {
+        expect(() => validateConstraints('setBezierControlPoint1', [50000, 50000])).not.toThrow();
+        expect(() => validateConstraints('setBezierControlPoint1', [-100001, 50000])).toThrow();
+        expect(() => validateConstraints('setBezierControlPoint1', [100001, 50000])).toThrow();
+    });
+
+    it('should validate scrollXY arguments', () => {
+        expect(() => validateConstraints('scrollXY', [50000, 50000])).not.toThrow();
+        expect(() => validateConstraints('scrollXY', [-100001, 50000])).toThrow();
+        expect(() => validateConstraints('scrollXY', [100001, 50000])).toThrow();
+    });
+
+    it('should validate setColor arguments', () => {
+        expect(() => validateConstraints('setColor', [50])).not.toThrow();
+        expect(() => validateConstraints('setColor', [-1])).toThrow();
+        expect(() => validateConstraints('setColor', [101])).toThrow();
+    });
+
+    it('should validate setGrey arguments', () => {
+        expect(() => validateConstraints('setGrey', [50])).not.toThrow();
+        expect(() => validateConstraints('setGrey', [-1])).toThrow();
+        expect(() => validateConstraints('setGrey', [101])).toThrow();
+    });
+
+    it('should validate setShade arguments', () => {
+        expect(() => validateConstraints('setShade', [50])).not.toThrow();
+        expect(() => validateConstraints('setShade', [-1])).toThrow();
+        expect(() => validateConstraints('setShade', [101])).toThrow();
+    });
+
+    it('should validate setHue arguments', () => {
+        expect(() => validateConstraints('setHue', [50])).not.toThrow();
+        expect(() => validateConstraints('setHue', [-1])).toThrow();
+        expect(() => validateConstraints('setHue', [101])).toThrow();
+    });
+
+    it('should validate setTranslucency arguments', () => {
+        expect(() => validateConstraints('setTranslucency', [50])).not.toThrow();
+        expect(() => validateConstraints('setTranslucency', [-1])).toThrow();
+        expect(() => validateConstraints('setTranslucency', [101])).toThrow();
+    });
+
+    it('should validate setPensize arguments', () => {
+        expect(() => validateConstraints('setPensize', [50])).not.toThrow();
+        expect(() => validateConstraints('setPensize', [-1])).toThrow();
+        expect(() => validateConstraints('setPensize', [101])).toThrow();
+    });
+});
diff --git a/js/js-export/constraints.js b/js/js-export/constraints.js
index 3aaba4e994..bc117e9932 100644
--- a/js/js-export/constraints.js
+++ b/js/js-export/constraints.js
@@ -1191,3 +1191,6 @@ JSInterface._methodArgConstraints = {
         ]
     ]
 };
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = { JSInterface }; 
+}