diff --git a/src/utils/bytes.ts b/src/utils/bytes.ts
index 06b4bd5e..5ca11896 100644
--- a/src/utils/bytes.ts
+++ b/src/utils/bytes.ts
@@ -14,7 +14,7 @@ export type Bytes = ArrayLike<number>;
  * @example
  * '0x123'
  */
-// export type BytesLike = Bytes | string | number;
+
 export type BytesLike = Bytes | string;
 export type BytesLikeWithNumber = BytesLike | number;
 
diff --git a/src/utils/tests/bytes/hex-concat.test.ts b/src/utils/tests/bytes/hex-concat.test.ts
new file mode 100644
index 00000000..bfbb1bd3
--- /dev/null
+++ b/src/utils/tests/bytes/hex-concat.test.ts
@@ -0,0 +1,28 @@
+import { utils as ethers } from 'ethers';
+import { hexConcat } from '../../bytes';
+
+describe('utils.hexConcat', () => {
+  it('should match ethers.js - hex values', () => {
+    const values = ['0x2048', '0x6917', '0x85616379'];
+    expect(hexConcat(values)).toBe(ethers.hexConcat(values));
+  });
+  it('should match ethers.js - UInt8Array values', () => {
+    const values = [
+      [5, 10, 247, 22],
+      [50, 255, 3],
+      [59, 36, 18, 46, 198, 234],
+    ];
+    expect(hexConcat(values)).toBe(ethers.hexConcat(values));
+  });
+  it('should match ethers.js - hex & UInt8Array values', () => {
+    const values = [
+      '0x2048',
+      [5, 10, 247, 22],
+      '0x6917',
+      [50, 255, 3],
+      '0x85616379',
+      [59, 36, 18, 46, 198, 234],
+    ];
+    expect(hexConcat(values)).toBe(ethers.hexConcat(values));
+  });
+});
diff --git a/src/utils/tests/bytes/hex-data-length.test.ts b/src/utils/tests/bytes/hex-data-length.test.ts
new file mode 100644
index 00000000..9bec5d41
--- /dev/null
+++ b/src/utils/tests/bytes/hex-data-length.test.ts
@@ -0,0 +1,27 @@
+import { utils as ethers } from 'ethers';
+import { hexDataLength } from '../../bytes';
+
+describe('utils.hexDataLength', () => {
+  it('should match ethers.js - hex values', () => {
+    const values = ['0x9347', '0x185754', '0x00005823'];
+    values.forEach((value) => {
+      expect(hexDataLength(value)).toBe(ethers.hexDataLength(value));
+    });
+  });
+  it('should match ethers.js - UInt8Array values', () => {
+    const values = [
+      [9, 58, 29, 24],
+      [185, 203],
+      [239, 30, 49, 41, 5, 10, 42],
+    ];
+    values.forEach((value) => {
+      expect(hexDataLength(value)).toBe(ethers.hexDataLength(value));
+    });
+  });
+  it('should return null - not hex value or not divisible by 2', () => {
+    const values = ['0x383', 'non-hex string'];
+    values.forEach((value) => {
+      expect(hexDataLength(value)).toBeNull();
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/hex-data-slice.test.ts b/src/utils/tests/bytes/hex-data-slice.test.ts
index 91fdba95..4fe7c0ab 100644
--- a/src/utils/tests/bytes/hex-data-slice.test.ts
+++ b/src/utils/tests/bytes/hex-data-slice.test.ts
@@ -1,12 +1,12 @@
-import * as ethers from 'ethers';
-import { hexDataSlice } from '../../../';
+import { utils as ethers } from 'ethers';
+import { hexDataSlice } from '../../bytes';
 
-describe('hexDataSlice', () => {
+describe('utils.hexDataSlice', () => {
   it('numbers - matches ethers strings', () => {
     const decimalValues = ['0x123456'];
     decimalValues.forEach((decimalValue) => {
       expect(hexDataSlice(decimalValue, 0, 2)).toStrictEqual(
-        ethers.utils.hexDataSlice(decimalValue, 0, 2),
+        ethers.hexDataSlice(decimalValue, 0, 2),
       );
     });
   });
@@ -14,13 +14,13 @@ describe('hexDataSlice', () => {
     const decimalValues = [0x1234567891011];
     decimalValues.forEach((decimalValue) => {
       expect(hexDataSlice(decimalValue, 3)).toStrictEqual(
-        ethers.utils.hexDataSlice(decimalValue as any, 3),
+        ethers.hexDataSlice(decimalValue as any, 3),
       );
       expect(hexDataSlice(decimalValue, 2, 4)).toStrictEqual(
-        ethers.utils.hexDataSlice(decimalValue as any, 2, 4),
+        ethers.hexDataSlice(decimalValue as any, 2, 4),
       );
       expect(hexDataSlice(decimalValue, 100)).toStrictEqual(
-        ethers.utils.hexDataSlice(decimalValue as any, 100),
+        ethers.hexDataSlice(decimalValue as any, 100),
       );
     });
   });
@@ -28,8 +28,14 @@ describe('hexDataSlice', () => {
     const decimalValues = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]];
     decimalValues.forEach((decimalValue) => {
       expect(hexDataSlice(decimalValue, 1, 2)).toStrictEqual(
-        ethers.utils.hexDataSlice(decimalValue as any, 1, 2),
+        ethers.hexDataSlice(decimalValue as any, 1, 2),
       );
     });
   });
+  it('should throw error - invalid hexData', () => {
+    const values = ['non-hex string', '0x938'];
+    values.forEach((value) => {
+      expect(() => hexDataSlice(value, 1, 3)).toThrow('invalid hexData');
+    });
+  });
 });
diff --git a/src/utils/tests/bytes/hex-strip-zeros.test.ts b/src/utils/tests/bytes/hex-strip-zeros.test.ts
new file mode 100644
index 00000000..e04097a0
--- /dev/null
+++ b/src/utils/tests/bytes/hex-strip-zeros.test.ts
@@ -0,0 +1,27 @@
+import { utils as ethers } from 'ethers';
+import { hexStripZeros } from '../../bytes';
+
+describe('utils.hexStripZeros', () => {
+  it('should match ethers.js - hex values', () => {
+    const values = ['0x00009347', '0x00185754', '0x00000000005823'];
+    values.forEach((value) => {
+      expect(hexStripZeros(value)).toBe(ethers.hexStripZeros(value));
+    });
+  });
+  it('should match ethers.js - UInt8Array values', () => {
+    const values = [
+      [0, 0, 0, 9, 58, 29, 24],
+      [0, 185, 203],
+      [0, 0, 0, 0, 239, 30, 49, 41, 5, 10, 42],
+    ];
+    values.forEach((value) => {
+      expect(hexStripZeros(value)).toBe(ethers.hexStripZeros(value));
+    });
+  });
+  it('should throw error - invalid hex string', () => {
+    const values = ['non-hex string'];
+    values.forEach((value) => {
+      expect(() => hexStripZeros(value)).toThrow('invalid hex string');
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/hex-value.test.ts b/src/utils/tests/bytes/hex-value.test.ts
new file mode 100644
index 00000000..67c7b55d
--- /dev/null
+++ b/src/utils/tests/bytes/hex-value.test.ts
@@ -0,0 +1,46 @@
+import { utils as ethers } from 'ethers';
+import { hexValue } from '../../bytes';
+import { tinyBig } from './../../../shared/tiny-big/tiny-big';
+
+describe('utils.hexValue', () => {
+  it('should match ethers.js - hex string', () => {
+    const values = ['0x9347', '0x185754', '0x00005823'];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe(ethers.hexValue(value));
+    });
+  });
+  it('should match ethers.js - UInt8Array', () => {
+    const values = [
+      [4, 50, 2],
+      [231, 49, 40, 70, 19],
+      [10, 68, 20, 98],
+    ];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe(ethers.hexValue(value));
+    });
+  });
+  it('should match ethers.js - TinyBig (hexable)', () => {
+    const values = [tinyBig('29389'), tinyBig(2834), tinyBig(402)];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe(ethers.hexValue(value));
+    });
+  });
+  it('should match ethers.js - number', () => {
+    const values = [624, 457, 23451];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe(ethers.hexValue(value));
+    });
+  });
+  it('should match ethers.js - BigInt', () => {
+    const values = [BigInt(204), BigInt('23491'), BigInt(4183459235723491)];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe(ethers.hexValue(value));
+    });
+  });
+  it('should return 0x0 - only zero data given', () => {
+    const values = [BigInt(0), 0, '0x0000', [0, 0, 0]];
+    values.forEach((value) => {
+      expect(hexValue(value)).toBe('0x0');
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/hexlify.test.ts b/src/utils/tests/bytes/hexlify.test.ts
index 17ecfd41..d34a20a6 100644
--- a/src/utils/tests/bytes/hexlify.test.ts
+++ b/src/utils/tests/bytes/hexlify.test.ts
@@ -1,14 +1,40 @@
-import * as ethers from 'ethers';
-import { hexlify } from '../../../';
+import { utils as ethers } from 'ethers';
+import { hexlify } from '../../bytes';
+import { BytesLike } from './../../bytes';
 
-describe('hexlify', () => {
+describe('utils.hexlify', () => {
   it('numbers - matches ethers strings', () => {
     const decimalValues = [0, 4, 5, 16, BigInt(0), BigInt(16)];
     decimalValues.forEach((decimalValue) => {
-      expect(hexlify(decimalValue)).toBe(ethers.utils.hexlify(decimalValue));
+      expect(hexlify(decimalValue)).toBe(ethers.hexlify(decimalValue));
     });
 
     const opts = { allowMissingPrefix: true };
-    expect(hexlify('22', opts)).toBe(ethers.utils.hexlify('22', opts));
+    expect(hexlify('22', opts)).toBe(ethers.hexlify('22', opts));
+  });
+  it('should match ethers.js - hexPad options', () => {
+    const values = [
+      ['0x3342e95', { hexPad: 'left' }],
+      ['0x41c942c42', { hexPad: 'right' }],
+    ];
+    values.forEach((value) => {
+      expect(hexlify(value[0] as any, value[1] as any)).toBe(
+        ethers.hexlify(value[0] as any, value[1] as any),
+      );
+    });
+  });
+  it('should throw error - hex data is odd-length', () => {
+    const values = ['0x931', '0x34414'];
+    values.forEach((value) => {
+      expect(() => hexlify(value)).toThrow('hex data is odd-length');
+    });
+  });
+  it('should throw error - invalid hexlify value', () => {
+    const values = ['non-hex string', false];
+    values.forEach((value) => {
+      expect(() => hexlify(value as BytesLike)).toThrow(
+        'invalid hexlify value',
+      );
+    });
   });
 });
diff --git a/src/utils/tests/bytes/is-bytes-like.test.ts b/src/utils/tests/bytes/is-bytes-like.test.ts
new file mode 100644
index 00000000..ba6d5c70
--- /dev/null
+++ b/src/utils/tests/bytes/is-bytes-like.test.ts
@@ -0,0 +1,39 @@
+import { utils as ethers } from 'ethers';
+import { isBytesLike } from '../../bytes';
+
+describe('utils.isBytesLike', () => {
+  it('should match ethers.js - hex string', () => {
+    const values = ['0x9347', '0x185754', '0x00005823'];
+    values.forEach((value) => {
+      expect(isBytesLike(value)).toBe(ethers.isBytesLike(value));
+    });
+  });
+  it('should match ethers.js - UInt8Array', () => {
+    const values = [
+      [9, 58, 29, 24],
+      [185, 203],
+      [239, 30, 49, 41, 5, 10, 42],
+    ];
+    values.forEach((value) => {
+      expect(isBytesLike(value)).toBe(ethers.isBytesLike(value));
+    });
+  });
+  it('should match ethers.js - number', () => {
+    const values = [152, 513, 2354];
+    values.forEach((value) => {
+      expect(isBytesLike(value)).toBe(ethers.isBytesLike(value));
+    });
+  });
+  it('should match ethers.js - non-hex string', () => {
+    const values = ['essential-eth', 'ethers.js', 'ethereum'];
+    values.forEach((value) => {
+      expect(isBytesLike(value)).toBe(ethers.isBytesLike(value));
+    });
+  });
+  it('should match ethers.js - boolean', () => {
+    const values = [false, true];
+    values.forEach((value) => {
+      expect(isBytesLike(value)).toBe(ethers.isBytesLike(value));
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/is-hex-string.test.ts b/src/utils/tests/bytes/is-hex-string.test.ts
new file mode 100644
index 00000000..3e9a7c43
--- /dev/null
+++ b/src/utils/tests/bytes/is-hex-string.test.ts
@@ -0,0 +1,51 @@
+import { utils as ethers } from 'ethers';
+import { isHexString } from '../../bytes';
+
+describe('utils.isHexString', () => {
+  it('should match ethers.js - hex string', () => {
+    const values = ['0x9347', '0x185754', '0x00005823'];
+    values.forEach((value) => {
+      expect(isHexString(value)).toBe(ethers.isHexString(value));
+    });
+  });
+  it('should match ethers.js - hex string of specific length', () => {
+    const values = [
+      ['0x9347', 2],
+      ['0x185754', 5],
+      ['0x00005823', 4],
+    ];
+    values.forEach((value) => {
+      expect(isHexString(value[0], value[1] as number)).toBe(
+        ethers.isHexString(value[0], value[1] as number),
+      );
+    });
+  });
+  it('should match ethers.js - UInt8Array', () => {
+    const values = [
+      [9, 58, 29, 24],
+      [185, 203],
+      [239, 30, 49, 41, 5, 10, 42],
+    ];
+    values.forEach((value) => {
+      expect(isHexString(value)).toBe(ethers.isHexString(value));
+    });
+  });
+  it('should match ethers.js - number', () => {
+    const values = [152, 513, 2354];
+    values.forEach((value) => {
+      expect(isHexString(value)).toBe(ethers.isHexString(value));
+    });
+  });
+  it('should match ethers.js - non-hex string', () => {
+    const values = ['essential-eth', 'ethers.js', 'ethereum'];
+    values.forEach((value) => {
+      expect(isHexString(value)).toBe(ethers.isHexString(value));
+    });
+  });
+  it('should match ethers.js - boolean', () => {
+    const values = [false, true];
+    values.forEach((value) => {
+      expect(isHexString(value)).toBe(ethers.isHexString(value));
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/strip-zeros.test.ts b/src/utils/tests/bytes/strip-zeros.test.ts
new file mode 100644
index 00000000..52360e43
--- /dev/null
+++ b/src/utils/tests/bytes/strip-zeros.test.ts
@@ -0,0 +1,27 @@
+import { utils as ethers } from 'ethers';
+import { stripZeros } from '../../bytes';
+
+describe('utils.stripZeros', () => {
+  it('should match ethers.js - hex string', () => {
+    const values = ['0x00009347', '0x00185754', '0x00000000005823'];
+    values.forEach((value) => {
+      expect(stripZeros(value)).toStrictEqual(ethers.stripZeros(value));
+    });
+  });
+  it('should match ethers.js - UInt8Array', () => {
+    const values = [
+      [0, 0, 0, 9, 58, 29, 24],
+      [0, 185, 203],
+      [0, 0, 0, 0, 239, 30, 49, 41, 5, 10, 42],
+    ];
+    values.forEach((value) => {
+      expect(stripZeros(value)).toStrictEqual(ethers.stripZeros(value));
+    });
+  });
+  it('should match ethers.js - empty array', () => {
+    const values = [[], '0x'];
+    values.forEach((value) => {
+      expect(stripZeros(value)).toStrictEqual(ethers.stripZeros(value));
+    });
+  });
+});
diff --git a/src/utils/tests/bytes/zero-pad.test.ts b/src/utils/tests/bytes/zero-pad.test.ts
new file mode 100644
index 00000000..8f88a66d
--- /dev/null
+++ b/src/utils/tests/bytes/zero-pad.test.ts
@@ -0,0 +1,41 @@
+import { utils as ethers } from 'ethers';
+import { zeroPad } from '../../bytes';
+import { BytesLike } from './../../bytes';
+
+describe('utils.zeroPad', () => {
+  it('should match ethers.js - hex string', () => {
+    const values = [
+      ['0x9347', 10],
+      ['0x185754', 5],
+      ['0x00005823', 7],
+    ];
+    values.forEach((value) => {
+      expect(zeroPad(value[0] as string, value[1] as number)).toStrictEqual(
+        ethers.zeroPad(value[0] as string, value[1] as number),
+      );
+    });
+  });
+  it('should match ethers.js - UInt8Array', () => {
+    const values = [
+      [[9, 58, 29, 24], 5],
+      [[185, 203], 4],
+      [[239, 30, 49, 41, 5, 10, 42], 10],
+    ];
+    values.forEach((value) => {
+      expect(zeroPad(value[0] as BytesLike, value[1] as number)).toStrictEqual(
+        ethers.zeroPad(value[0] as BytesLike, value[1] as number),
+      );
+    });
+  });
+  it('should throw error - value out of range', () => {
+    const values = [
+      [[9, 58, 29, 24], 3],
+      ['0x185754', 1],
+    ];
+    values.forEach((value) => {
+      expect(() => zeroPad(value[0] as BytesLike, value[1] as number)).toThrow(
+        'value out of range',
+      );
+    });
+  });
+});