diff --git a/src/test/sensor.test.ts b/src/test/sensor.test.ts
index 4ab24d8..8da0bff 100644
--- a/src/test/sensor.test.ts
+++ b/src/test/sensor.test.ts
@@ -6,6 +6,10 @@ describe("isValidSensorValue()", () => {
     expect(isValidSensorValue(50)).toBe(true);
   });
 
+  it("return true for a value between 0 and 100", () => {
+    expect(isValidSensorValue(99)).toBe(true);
+  });
+
   it("returns false for negative values", () => {
     expect(isValidSensorValue(-1)).toBe(false);
   });