diff --git a/src/roundToNearestHours/test.ts b/src/roundToNearestHours/test.ts
index b7c4e560e3..4623a23075 100644
--- a/src/roundToNearestHours/test.ts
+++ b/src/roundToNearestHours/test.ts
@@ -43,7 +43,58 @@ describe('roundToNearestHours', function () {
   it('does not mutate the original date', function () {
     const date = new Date(2014, 6 /* Jul */, 10, 12, 10, 10, 99)
     roundToNearestHours(date)
-    assert.deepStrictEqual(date, new Date(2014, 6 /* Jul */, 10, 12, 10, 10, 99))
+    assert.deepStrictEqual(
+      date,
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 10, 99)
+    )
+  })
+
+  it('rounds according to the passed mode - floor', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 12, 30, 0, 5),
+      { roundingMethod: 'floor' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 13, 0, 0))
+  })
+
+  it('rounds according to the passed mode - floor - when nearestTo is provided', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 15, 10, 30, 5),
+      { nearestTo: 4, roundingMethod: 'floor' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 16, 0, 0))
+  })
+
+  it('rounds according to the passed mode - ceil', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 30, 5),
+      { roundingMethod: 'ceil' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 13, 0, 0))
+  })
+
+  it('rounds according to the passed mode - ceil - when nearestTo is provided', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 30, 5),
+      { nearestTo: 4, roundingMethod: 'ceil' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 16, 0, 0))
+  })
+
+  it('rounds according to the passed mode - round - when nearestTo is provided', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 30, 5),
+      { nearestTo: 4, roundingMethod: 'round' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 0, 0))
+  })
+
+  it('rounds according to the passed mode - trunc - when nearestTo is provided', () => {
+    const result = roundToNearestHours(
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 30, 5),
+      { nearestTo: 4, roundingMethod: 'trunc' }
+    )
+    assert.deepStrictEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 0, 0))
   })
 
   it('returns `Invalid Date` if the given date is invalid', function () {