diff --git a/js/__tests__/turtle.test.js b/js/__tests__/turtle.test.js
new file mode 100644
index 0000000000..936360f97e
--- /dev/null
+++ b/js/__tests__/turtle.test.js
@@ -0,0 +1,252 @@
+require("../turtle");
+const Turtle = global.Turtle;
+// Mock all external dependencies
+global.importMembers = jest.fn();
+global.Singer = jest.fn().mockImplementation(() => ({
+    attack: [],
+    decay: [],
+    sustain: [],
+    release: [],
+    scalarTransposition: 0,
+    scalarTranspositionValues: [],
+    transposition: 0,
+    transpositionValues: [],
+    register: 0,
+    beatFactor: 1,
+    dotCount: 0,
+    noteBeat: {},
+    noteValue: {},
+    oscList: {},
+    noteDrums: {},
+    notePitches: {},
+    noteOctaves: {},
+    noteCents: {},
+    noteHertz: {},
+    noteBeatValues: {},
+    embeddedGraphics: {},
+    lastNotePlayed: null,
+    previousNotePlayed: null,
+    noteStatus: null,
+    noteDirection: 0,
+    pitchNumberOffset: 39,
+    currentOctave: 4,
+    inHarmonic: [],
+    partials: [],
+    inNeighbor: [],
+    neighborStepPitch: [],
+    neighborNoteValue: [],
+    inDefineMode: false,
+    defineMode: [],
+    notesPlayed: [0, 1],
+    whichNoteToCount: 1,
+    movable: false,
+    bpm: [],
+    previousTurtleTime: 0,
+    turtleTime: 0,
+    pushedNote: false,
+    duplicateFactor: 1,
+    inDuplicate: false,
+    skipFactor: 1,
+    skipIndex: 0,
+    instrumentNames: [],
+    inCrescendo: [],
+    crescendoDelta: [],
+    crescendoInitialVolume: {},
+    intervals: [],
+    semitoneIntervals: [],
+    staccato: [],
+    glide: [],
+    glideOverride: 0,
+    swing: [],
+    swingTarget: [],
+    swingCarryOver: 0,
+    tie: false,
+    tieNotePitches: [],
+    tieNoteExtras: [],
+    tieCarryOver: 0,
+    tieFirstDrums: [],
+    drift: 0,
+    maxLagCorrectionRatio: 0.25,
+    drumStyle: [],
+    voices: [],
+    backward: [],
+    vibratoIntensity: [],
+    vibratoRate: [],
+    distortionAmount: [],
+    tremoloFrequency: [],
+    tremoloDepth: [],
+    rate: [],
+    octaves: [],
+    baseFrequency: [],
+    chorusRate: [],
+    delayTime: [],
+    chorusDepth: [],
+    neighborArgNote1: [],
+    neighborArgNote2: [],
+    neighborArgBeat: [],
+    neighborArgCurrentBeat: [],
+    inNoteBlock: [],
+    multipleVoices: false,
+    invertList: [],
+    beatList: [],
+    factorList: [],
+    keySignature: "",
+    pitchDrumTable: {},
+    defaultStrongBeats: false,
+    pickup: 0,
+    beatsPerMeasure: 4,
+    noteValuePerBeat: 4,
+    currentBeat: 0,
+    currentMeasure: 0,
+    justCounting: [],
+    justMeasuring: [],
+    firstPitch: [],
+    lastPitch: [],
+    suppressOutput: false,
+    dispatchFactor: 1,
+    runningFromEvent: false
+}));
+global.Painter = jest.fn().mockImplementation(() => ({
+    cp1x: 0,
+    cp1y: 100,
+    cp2x: 100,
+    cp2y: 100
+}));
+global.delayExecution = jest.fn();
+global.DEFAULTVOICE = "electronic synth";
+global.DEFAULTVOLUME = 50;
+
+describe("Turtle", () => {
+    let turtle;
+    let mockActivity;
+
+    beforeEach(() => {
+        mockActivity = { refreshCanvas: jest.fn() };
+        turtle = new Turtle(mockActivity, 0, "turtle1", {}, null);
+    });
+
+    describe("blinking()", () => {
+        it("should return false when _blinkFinished is true", () => {
+            turtle._blinkFinished = true;
+            expect(turtle.blinking()).toBe(false);
+        });
+
+        it("should return true when _blinkFinished is false", () => {
+            turtle._blinkFinished = false;
+            expect(turtle.blinking()).toBe(true);
+        });
+    });
+
+    describe("doWait()", () => {
+        it("should set _waitTime in milliseconds", () => {
+            turtle.doWait(2);
+            expect(turtle._waitTime).toBe(2000);
+        });
+
+        it("should handle decimal seconds", () => {
+            turtle.doWait(0.5);
+            expect(turtle._waitTime).toBe(500);
+        });
+
+        it("should handle string input by converting to number", () => {
+            turtle.doWait("3");
+            expect(turtle._waitTime).toBe(3000);
+        });
+
+        it("should set _waitTime to 0 when called with 0", () => {
+            turtle.doWait(0);
+            expect(turtle._waitTime).toBe(0);
+        });
+    });
+
+    describe("initTurtle()", () => {
+        it("should reset _waitTime to 0", () => {
+            turtle.doWait(5);
+            turtle.initTurtle(false);
+            expect(turtle._waitTime).toBe(0);
+        });
+
+        it("should set embeddedGraphicsFinished to true", () => {
+            turtle.embeddedGraphicsFinished = false;
+            turtle.initTurtle(false);
+            expect(turtle.embeddedGraphicsFinished).toBe(true);
+        });
+
+        it("should set inSetTimbre to false", () => {
+            turtle.inSetTimbre = true;
+            turtle.initTurtle(false);
+            expect(turtle.inSetTimbre).toBe(false);
+        });
+
+        it("should reset singer.scalarTransposition to 0", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.scalarTransposition).toBe(0);
+        });
+
+        it("should reset singer.register to 0", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.register).toBe(0);
+        });
+
+        it("should reset singer.beatFactor to 1", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.beatFactor).toBe(1);
+        });
+
+        it("should set singer.keySignature to C major", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.keySignature).toBe("C major");
+        });
+
+        it("should set singer.beatsPerMeasure to 4", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.beatsPerMeasure).toBe(4);
+        });
+
+        it("should set singer.noteValuePerBeat to 4", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.noteValuePerBeat).toBe(4);
+        });
+
+        it("should set singer.currentOctave to 4", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.currentOctave).toBe(4);
+        });
+
+        it("should set singer.suppressOutput to the passed argument", () => {
+            turtle.initTurtle(true);
+            expect(turtle.singer.suppressOutput).toBe(true);
+        });
+
+        it("should set singer.suppressOutput to false when passed false", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.suppressOutput).toBe(false);
+        });
+
+        it("should initialize singer.notesPlayed to [0, 1]", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.notesPlayed).toEqual([0, 1]);
+        });
+
+        it("should reset singer.tie to false", () => {
+            turtle.singer.tie = true;
+            turtle.initTurtle(false);
+            expect(turtle.singer.tie).toBe(false);
+        });
+
+        it("should reset singer.transposition to 0", () => {
+            turtle.initTurtle(false);
+            expect(turtle.singer.transposition).toBe(0);
+        });
+
+        it("should initialize endOfClampSignals as empty object", () => {
+            turtle.initTurtle(false);
+            expect(turtle.endOfClampSignals).toEqual({});
+        });
+
+        it("should initialize butNotThese as empty object", () => {
+            turtle.initTurtle(false);
+            expect(turtle.butNotThese).toEqual({});
+        });
+    });
+});