diff --git a/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.js b/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.js
index 0afa22b..b091fa0 100644
--- a/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.js
+++ b/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.js
@@ -89,7 +89,7 @@ export const calculateAttackEfficiency = (protectionWeakness) => {
  * @param {boolean} Q6 The answer to Q6.
  * @returns {string} The threat occurrence
  */
-const calculateOccurrence = (attackEfficiency, Q5, Q6) => {
+export const calculateOccurrence = (attackEfficiency, Q5, Q6) => {
   if (Q5 === true && Q6 === true) {
     if (attackEfficiency === "Low") {
       return "Medium";
diff --git a/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.test.js b/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.test.js
index 26e20fe..1e2f8f9 100644
--- a/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.test.js
+++ b/src/features/BinaryRiskMatrix/BinaryRiskMatrixLogic/calculateLikelihood/calculateLikelihood.test.js
@@ -2,6 +2,7 @@ import {
   calculateThreatScope,
   calculateProtectionWeakness,
   calculateAttackEfficiency,
+  calculateOccurrence,
 } from "./calculateLikelihood";
 
 describe("testing the calculateThreatScope function", () => {
@@ -175,3 +176,125 @@ describe("testing the calculateAttackEfficiency function", () => {
     expect(calculateAttackEfficiency(protectionWeakness)).toBe(expectValue);
   });
 });
+
+describe("testing the calculateOccurrence function", () => {
+  it("should return Medium if the attackEfficiency is Low, and Q5 & Q6 are both true", () => {
+    const expectValue = "Medium";
+    const attackEfficiency = "Low";
+    const Q5Value = true;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Low if the attackEfficiency is Low, and Q5 & Q6 are both false", () => {
+    const expectValue = "Low";
+    const attackEfficiency = "Low";
+    const Q5Value = false;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Low if the attackEfficiency is Low, and Q5 is true & Q6 is false", () => {
+    const expectValue = "Low";
+    const attackEfficiency = "Low";
+    const Q5Value = true;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Low if the attackEfficiency is Low, and Q5 is false & Q6 is true", () => {
+    const expectValue = "Low";
+    const attackEfficiency = "Low";
+    const Q5Value = false;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return High if the attackEfficiency is Medium, and Q5 & Q6 are both true", () => {
+    const expectValue = "High";
+    const attackEfficiency = "Medium";
+    const Q5Value = true;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Low if the attackEfficiency is Medium, and Q5 & Q6 are both false", () => {
+    const expectValue = "Low";
+    const attackEfficiency = "Medium";
+    const Q5Value = false;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Medium if the attackEfficiency is Medium, and Q5 is true & Q6 is false", () => {
+    const expectValue = "Medium";
+    const attackEfficiency = "Medium";
+    const Q5Value = true;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Medium if the attackEfficiency is Medium, and Q5 is false & Q6 is true", () => {
+    const expectValue = "Medium";
+    const attackEfficiency = "Medium";
+    const Q5Value = false;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return High if the attackEfficiency is High, and Q5 & Q6 are both true", () => {
+    const expectValue = "High";
+    const attackEfficiency = "High";
+    const Q5Value = true;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return Medium if the attackEfficiency is High, and Q5 & Q6 are both false", () => {
+    const expectValue = "Medium";
+    const attackEfficiency = "High";
+    const Q5Value = false;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return High if the attackEfficiency is High, and Q5 is true & Q6 is false", () => {
+    const expectValue = "High";
+    const attackEfficiency = "High";
+    const Q5Value = true;
+    const Q6Value = false;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+
+  it("should return High if the attackEfficiency is High, and Q5 is false & Q6 is true", () => {
+    const expectValue = "High";
+    const attackEfficiency = "High";
+    const Q5Value = false;
+    const Q6Value = true;
+    expect(calculateOccurrence(attackEfficiency, Q5Value, Q6Value)).toBe(
+      expectValue
+    );
+  });
+});