diff --git a/src/tests/Abstract.test.ts b/src/tests/Abstract.test.ts
index fbebd2c..72328f8 100644
--- a/src/tests/Abstract.test.ts
+++ b/src/tests/Abstract.test.ts
@@ -30,7 +30,7 @@ describe('Abstract implementation', () => {
       mockSound.mute = false;
     });
 
-    it('allows `set` and `get`', () => {
+    it('allows `set` and `get`', async () => {
       expect(mockSound.mute).toBe(false);
       mockSound.mute = true;
       expect(mockSound.mute).toBe(true);
@@ -40,7 +40,7 @@ describe('Abstract implementation', () => {
     it.todo('sets gain to 0 when muted');
     it.todo('sets gain to volume when un-muted');
 
-    it('fades to new value', () => {
+    it('fades to new value', async () => {
       const mockOptions: SoundConfig = {
         volume: 0.6,
         fadeMs: 100,
@@ -105,24 +105,24 @@ describe('Abstract implementation', () => {
       mockSound.mute = false;
     });
 
-    it('allows `set` and `get`', () => {
+    it('allows `set` and `get`', async () => {
       const mockVolume = 0.4;
       mockSound.volume = mockVolume;
 
       expect(mockSound.volume).toBe(mockVolume);
     });
 
-    it('restricts value to a minimum of `0`', () => {
+    it('restricts value to a minimum of `0`', async () => {
       mockSound.volume = -2;
       expect(mockSound.volume).toBe(0);
     });
 
-    it('restricts value to a maximum of `1`', () => {
+    it('restricts value to a maximum of `1`', async () => {
       mockSound.volume = 2;
       expect(mockSound.volume).toBe(1);
     });
 
-    it('sets value on `gain`', () => {
+    it('sets value on `gain`', async () => {
       const oldValue = mockSound.volume;
       const newValue = 0.6;
       const {currentTime} = defaultContext;
@@ -145,7 +145,7 @@ describe('Abstract implementation', () => {
       expect(spyGainRamp).toBeCalledWith(newValue, currentTime);
     });
 
-    it('does not set value on gain if muted', () => {
+    it('does not set value on gain if muted', async () => {
       const mockVolume = 0.2;
 
       const spyGainCancel = vi.spyOn(
@@ -179,7 +179,7 @@ describe('Abstract implementation', () => {
       expect(spyGainRamp).not.toBeCalledTimes(2);
     });
 
-    it('fades to new volume', () => {
+    it('fades to new volume', async () => {
       const mockOptions: SoundConfig = {
         volume: 0.6,
         fadeMs: 100,
diff --git a/src/tests/Earwurm.test.ts b/src/tests/Earwurm.test.ts
index 537341d..18619e9 100644
--- a/src/tests/Earwurm.test.ts
+++ b/src/tests/Earwurm.test.ts
@@ -28,7 +28,7 @@ describe('Earwurm component', () => {
   });
 
   describe('initialization', () => {
-    it('is initialized with default values', () => {
+    it('is initialized with default values', async () => {
       expect(mockManager).toBeInstanceOf(Earwurm);
 
       // Class static properties
diff --git a/src/tests/Stack.test.ts b/src/tests/Stack.test.ts
index 4ba6ef3..5309601 100644
--- a/src/tests/Stack.test.ts
+++ b/src/tests/Stack.test.ts
@@ -27,7 +27,7 @@ describe('Stack component', () => {
   });
 
   describe('initialization', () => {
-    it('is initialized with default values', () => {
+    it('is initialized with default values', async () => {
       expect(mockStack).toBeInstanceOf(Stack);
 
       // Class static properties
diff --git a/src/tests/helpers.test.ts b/src/tests/helpers.test.ts
index 368761a..ac3e821 100644
--- a/src/tests/helpers.test.ts
+++ b/src/tests/helpers.test.ts
@@ -13,7 +13,7 @@ describe('Helpers', () => {
   const mockContext = new AudioContext();
 
   describe('getErrorMessage()', () => {
-    it('returns message from basic object', () => {
+    it('returns message from basic object', async () => {
       const mockError = {
         message: 'foo',
       };
@@ -23,7 +23,7 @@ describe('Helpers', () => {
       expect(result).toBe(mockError.message);
     });
 
-    it('returns message from Error', () => {
+    it('returns message from Error', async () => {
       const mockMessage = 'Foo';
       const mockError = new Error(mockMessage, {
         cause: 'bar',
@@ -34,7 +34,7 @@ describe('Helpers', () => {
       expect(result).toBe(mockMessage);
     });
 
-    it('returns stringified result when unknown', () => {
+    it('returns stringified result when unknown', async () => {
       const mockError = ['foo', true, {bar: false}, null];
       const result = getErrorMessage(mockError);
 
@@ -67,7 +67,7 @@ describe('Helpers', () => {
   });
 
   describe('linearRamp()', () => {
-    it('transitions to the specified value', () => {
+    it('transitions to the specified value', async () => {
       const mockAudioParam = new AudioParam();
 
       const spyCancel = vi.spyOn(mockAudioParam, 'cancelScheduledValues');
@@ -104,7 +104,7 @@ describe('Helpers', () => {
   });
 
   describe('scratchBuffer()', () => {
-    it('creates a short silent AudioBuffer', () => {
+    it('creates a short silent AudioBuffer', async () => {
       const result = scratchBuffer(mockContext);
 
       expect(result).toBeInstanceOf(AudioBuffer);
@@ -120,7 +120,7 @@ describe('Helpers', () => {
       vi.advanceTimersToNextTimer();
     });
 
-    it('resumes AudioContext state', () => {
+    it('resumes AudioContext state', async () => {
       const spyCreateBuffer = vi.spyOn(mockContext, 'createBuffer');
       const spyResume = vi.spyOn(mockContext, 'resume');
 
@@ -147,7 +147,7 @@ describe('Helpers', () => {
       expect(spySourceStart).toBeCalledTimes(1);
     });
 
-    it('calls onEnded after interaction event', () => {
+    it('calls onEnded after interaction event', async () => {
       vi.spyOn(
         AudioBufferSourceNode.prototype,
         'addEventListener',
diff --git a/src/tests/utilities.test.ts b/src/tests/utilities.test.ts
index 1cd0d31..074171e 100644
--- a/src/tests/utilities.test.ts
+++ b/src/tests/utilities.test.ts
@@ -12,12 +12,12 @@ import {
 describe('Utilities', () => {
   describe('Array', () => {
     describe('arrayOfLength()', () => {
-      it('returns an empty array by default', () => {
+      it('returns an empty array by default', async () => {
         const result = arrayOfLength();
         expect(result).toStrictEqual([]);
       });
 
-      it('returns an array of incremented index values', () => {
+      it('returns an array of incremented index values', async () => {
         const mockLength = 6;
         const result = arrayOfLength(mockLength);
 
@@ -27,7 +27,7 @@ describe('Utilities', () => {
     });
 
     describe('arrayShallowEquals()', () => {
-      it('returns `true` when matching', () => {
+      it('returns `true` when matching', async () => {
         const result = arrayShallowEquals(
           [true, false, null, undefined, 0, 1, 'end'],
           [true, false, null, undefined, 0, 1, 'end'],
@@ -35,7 +35,7 @@ describe('Utilities', () => {
         expect(result).toBe(true);
       });
 
-      it('returns `false` when at least one value is unmatched', () => {
+      it('returns `false` when at least one value is unmatched', async () => {
         const result = arrayShallowEquals([true, false], [false, true]);
         expect(result).toBe(false);
       });
@@ -44,32 +44,32 @@ describe('Utilities', () => {
 
   describe('Numbers', () => {
     describe('assertNumber()', () => {
-      it('accepts an integer', () => {
+      it('accepts an integer', async () => {
         const result = assertNumber(123);
         expect(result).toBe(true);
       });
 
-      it('accepts a float', () => {
+      it('accepts a float', async () => {
         const result = assertNumber(123.456);
         expect(result).toBe(true);
       });
 
-      it('does not allow a bigint', () => {
+      it('does not allow a bigint', async () => {
         const result = assertNumber(1000n);
         expect(result).toBe(false);
       });
 
-      it('does not allow NaN', () => {
+      it('does not allow NaN', async () => {
         const result = assertNumber(NaN);
         expect(result).toBe(false);
       });
 
-      it('does not allow Infinity', () => {
+      it('does not allow Infinity', async () => {
         const result = assertNumber(Infinity);
         expect(result).toBe(false);
       });
 
-      it('does not allow other non-numnber types', () => {
+      it('does not allow other non-numnber types', async () => {
         expect(assertNumber(true)).toBe(false);
         expect(assertNumber(false)).toBe(false);
         expect(assertNumber({one: 1})).toBe(false);
@@ -79,21 +79,21 @@ describe('Utilities', () => {
     });
 
     describe('clamp()', () => {
-      it('returns preference', () => {
+      it('returns preference', async () => {
         const mockArgs: Parameters<typeof clamp> = [1, 10, 100];
         const result = clamp(...mockArgs);
 
         expect(result).toBe(10);
       });
 
-      it('returns min', () => {
+      it('returns min', async () => {
         const mockArgs: Parameters<typeof clamp> = [10, 1, 100];
         const result = clamp(...mockArgs);
 
         expect(result).toBe(10);
       });
 
-      it('returns max', () => {
+      it('returns max', async () => {
         const mockArgs: Parameters<typeof clamp> = [1, 100, 10];
         const result = clamp(...mockArgs);
 
@@ -102,24 +102,24 @@ describe('Utilities', () => {
     });
 
     describe('progressPercentage()', () => {
-      it('returns percentage integer', () => {
+      it('returns percentage integer', async () => {
         const result = progressPercentage(6, 20);
         expect(result).toBe(30);
       });
 
-      it('round down floating-point result', () => {
+      it('round down floating-point result', async () => {
         const result = progressPercentage(12, 345);
         // Before Math.floor(), result should be:
         // 3.4782608695652173
         expect(result).toBe(3);
       });
 
-      it('protects against NaN', () => {
+      it('protects against NaN', async () => {
         const result = progressPercentage(0, 0);
         expect(result).toBe(0);
       });
 
-      it('protects against Infinity', () => {
+      it('protects against Infinity', async () => {
         const result = progressPercentage(2, 0);
         expect(result).toBe(0);
       });
@@ -128,14 +128,14 @@ describe('Utilities', () => {
 
   describe('Time', () => {
     describe('msToSec()', () => {
-      it('converts to seconds', () => {
+      it('converts to seconds', async () => {
         const result = msToSec(1234);
         expect(result).toBe(1.234);
       });
     });
 
     describe('secToMs()', () => {
-      it('converts to milliseconds', () => {
+      it('converts to milliseconds', async () => {
         const result = secToMs(5.678);
         expect(result).toBe(5678);
       });