diff --git a/js/objects.js b/js/objects.js
index 7abc8e26..7249e2b9 100644
--- a/js/objects.js
+++ b/js/objects.js
@@ -128,29 +128,21 @@ export class InfoBox {
   }
 
   isHere(mouseX, mouseY) {
-    if (
+    return (
       mouseX > this.x &&
       mouseX < this.x + this.width &&
       mouseY > this.y &&
       mouseY < this.y + this.height
-    ) {
-      return true;
-    }
-
-    return false;
+    );
   }
 
   isVisible(x, y, width, height) {
-    if (
+    return (
       x + width > this.x &&
       x < this.x + this.width &&
       y + height > this.y &&
       y < this.y + this.height
-    ) {
-      return true;
-    }
-
-    return false;
+    );
   }
 }
 
@@ -245,15 +237,11 @@ export class Link {
     console.log("boxHeight: ", this.boxHeight);
     */
 
-    if (
+    return (
       x + width > boxX &&
       x < boxX + boxWidth &&
       y + height > boxY &&
       y < boxY + boxHeight
-    ) {
-      return true;
-    }
-
-    return false;
+    );
   }
 }
diff --git a/test/objects.test.js b/test/objects.test.js
new file mode 100644
index 00000000..c94571b6
--- /dev/null
+++ b/test/objects.test.js
@@ -0,0 +1,169 @@
+import { InfoBox, Link } from "../js/objects";
+
+describe("InfoBox", () => {
+  it("should initialize with correct values", () => {
+    const id = 1;
+
+    const infoBox = new InfoBox(id);
+
+    expect(infoBox.id).toBe(id);
+    expect(infoBox.x).toBe(0);
+    expect(infoBox.y).toBe(0);
+    expect(infoBox.width).toBe(120);
+    expect(infoBox.height).toBe(240);
+    expect(infoBox.lineColor).toBe("black");
+    expect(infoBox.lineWidth).toBe(2);
+    expect(infoBox.color).toBe("white");
+    expect(infoBox.row).toBe(-1);
+    expect(infoBox.texImg).toBe(null);
+    expect(infoBox.name).toBe("");
+    expect(infoBox.momentum).toBe(0);
+    expect(infoBox.px).toBe(0);
+    expect(infoBox.py).toBe(0);
+    expect(infoBox.pz).toBe(0);
+    expect(infoBox.vertex).toBe(0);
+    expect(infoBox.vx).toBe(0);
+    expect(infoBox.vy).toBe(0);
+    expect(infoBox.vz).toBe(0);
+    expect(infoBox.time).toBe(0);
+    expect(infoBox.mass).toBe(0);
+    expect(infoBox.charge).toBe(0);
+    expect(infoBox.pdg).toBe(0);
+    expect(infoBox.genStatus).toBe(0);
+    expect(infoBox.simStatus).toBe(0);
+    expect(infoBox.parents).toEqual([]);
+    expect(infoBox.children).toEqual([]);
+    expect(infoBox.parentLinks).toEqual([]);
+    expect(infoBox.childrenLinks).toEqual([]);
+  });
+
+  it("should return true if (x, y) coordinates are within the box", () => {
+    const infoBox = new InfoBox(1);
+    const x = 60;
+    const y = 120;
+
+    const result = infoBox.isHere(x, y);
+
+    expect(result).toBe(true);
+  });
+
+  it("should return false if x coordinate is outside the box", () => {
+    const infoBox = new InfoBox(1);
+    const x = 200;
+    const y = 120;
+
+    const result = infoBox.isHere(x, y);
+
+    expect(result).toBe(false);
+  });
+
+  it("should return false if y coordinate is outside the box", () => {
+    const infoBox = new InfoBox(1);
+    const x = 50;
+    const y = -1;
+
+    const result = infoBox.isHere(x, y);
+
+    expect(result).toBe(false);
+  });
+
+  it("should return true if box is visible within the given area", () => {
+    const infoBox = new InfoBox(1);
+    const x = 0;
+    const y = 0;
+    const width = 200;
+    const height = 200;
+
+    const result = infoBox.isVisible(x, y, width, height);
+
+    expect(result).toBe(true);
+  });
+
+  it("should return false if the box is to the right of the area", () => {
+    const infoBox = new InfoBox(1);
+    infoBox.x = 300;
+    const x = 0;
+    const y = 0;
+    const width = 200;
+    const height = 200;
+
+    const result = infoBox.isVisible(x, y, width, height);
+
+    expect(result).toBe(false);
+  });
+
+  it("should return false if the box is to the left of the area", () => {
+    const infoBox = new InfoBox(1);
+    infoBox.x = -300;
+    const x = 0;
+    const y = 0;
+    const width = 200;
+    const height = 200;
+
+    const result = infoBox.isVisible(x, y, width, height);
+
+    expect(result).toBe(false);
+  });
+
+  it("should return false if the box is below the area", () => {
+    const infoBox = new InfoBox(1);
+    infoBox.y = 300;
+    const x = 0;
+    const y = 0;
+    const width = 200;
+    const height = 200;
+
+    const result = infoBox.isVisible(x, y, width, height);
+
+    expect(result).toBe(false);
+  });
+
+  it("should return false if the box is above the area", () => {
+    const infoBox = new InfoBox(1);
+    infoBox.y = -300;
+    const x = 0;
+    const y = 0;
+    const width = 200;
+    const height = 200;
+
+    const result = infoBox.isVisible(x, y, width, height);
+
+    expect(result).toBe(false);
+  });
+});
+
+describe("Link", () => {
+  it("should construct correctly", () => {
+    const link = new Link(1, 0, 1);
+
+    expect(link.id).toBe(1);
+    expect(link.from).toBe(0);
+    expect(link.to).toBe(1);
+    expect(link.color).toBe("#A00");
+    expect(link.xShift).toBe(0);
+  });
+
+  it("should return true if the link is visible", () => {
+    const firstInfoBox = new InfoBox(0);
+    const secondInfoBox = new InfoBox(1);
+    secondInfoBox.x = 140;
+    secondInfoBox.y = 250;
+    const infoBoxes = [firstInfoBox, secondInfoBox];
+    const link = new Link(1, 0, 1);
+
+    const result = link.isVisible(0, 0, 250, 250, infoBoxes);
+
+    expect(result).toBe(true);
+  });
+
+  it("should return false if the link is not visible", () => {
+    const firstInfoBox = new InfoBox(0);
+    const secondInfoBox = new InfoBox(1);
+    const infoBoxes = [firstInfoBox, secondInfoBox];
+    const link = new Link(1, 0, 1);
+
+    const result = link.isVisible(10, 10, 50, 50, infoBoxes);
+
+    expect(result).toBe(false);
+  });
+});