diff --git a/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer.fbs b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer.fbs
new file mode 100644
index 0000000..e0356fa
--- /dev/null
+++ b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer.fbs
@@ -0,0 +1,32 @@
+enum Color:ubyte (bit_flags) {
+  Red = 0, // color Red = (1u << 0)
+  /// \brief color Green
+  /// Green is bit_flag with value (1u << 1)
+  Green,
+  /// \brief color Blue (1u << 3)
+  Blue = 3,
+}
+
+struct Test { a:short; b:byte; }
+
+struct Vec3 (force_align: 8) {
+  x:float;
+  y:float;
+  z:float;
+  test1:double;
+  test2:Color;
+  test3:Test;
+}
+
+/// an example documentation comment: "monster object"
+table Monster {
+  pos:Vec3 (id: 0);
+  hp:short = 100 (id: 2);
+  mana:short = 150 (id: 1);
+  name:string (id: 3, key);
+  color:Color = Blue (id: 6);
+  inventory:[ubyte] (id: 5);
+  testarrayoftables:[Monster] (id: 4);
+}
+
+root_type Monster;
diff --git a/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer_generated.swift b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer_generated.swift
new file mode 100644
index 0000000..7051380
--- /dev/null
+++ b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/fuzzer_generated.swift
@@ -0,0 +1,336 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+// swiftlint:disable all
+// swiftformat:disable all
+
+import FlatBuffers
+
+public enum Color: UInt8, Enum, Verifiable {
+  public typealias T = UInt8
+  public static var byteSize: Int { return MemoryLayout<UInt8>.size }
+  public var value: UInt8 { return self.rawValue }
+  case red = 1
+  ///  \brief color Green
+  ///  Green is bit_flag with value (1u << 1)
+  case green = 2
+  ///  \brief color Blue (1u << 3)
+  case blue = 8
+
+  public static var max: Color { return .blue }
+  public static var min: Color { return .red }
+}
+
+extension Color: Encodable {
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.singleValueContainer()
+    switch self {
+    case .red: try container.encode("Red")
+    case .green: try container.encode("Green")
+    case .blue: try container.encode("Blue")
+    }
+  }
+}
+
+public struct Test: NativeStruct, Verifiable, FlatbuffersInitializable {
+
+  static func validateVersion() { FlatBuffersVersion_2_0_0() }
+
+  private var _a: Int16
+  private var _b: Int8
+  private let padding0__: UInt8 = 0
+
+  public init(_ bb: ByteBuffer, o: Int32) {
+    let _accessor = Struct(bb: bb, position: o)
+    _a = _accessor.readBuffer(of: Int16.self, at: 0)
+    _b = _accessor.readBuffer(of: Int8.self, at: 2)
+  }
+
+  public init(a: Int16, b: Int8) {
+    _a = a
+    _b = b
+  }
+
+  public init() {
+    _a = 0
+    _b = 0
+  }
+
+  public var a: Int16 { _a }
+  public var b: Int8 { _b }
+
+  public static func verify<T>(_ verifier: inout Verifier, at position: Int, of type: T.Type) throws where T: Verifiable {
+    try verifier.inBuffer(position: position, of: Test.self)
+  }
+}
+
+extension Test: Encodable {
+
+  enum CodingKeys: String, CodingKey {
+    case a = "a"
+    case b = "b"
+  }
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    if a != 0 {
+      try container.encodeIfPresent(a, forKey: .a)
+    }
+    if b != 0 {
+      try container.encodeIfPresent(b, forKey: .b)
+    }
+  }
+}
+
+public struct Test_Mutable: FlatBufferObject {
+
+  static func validateVersion() { FlatBuffersVersion_2_0_0() }
+  public var __buffer: ByteBuffer! { return _accessor.bb }
+  private var _accessor: Struct
+
+  public init(_ bb: ByteBuffer, o: Int32) { _accessor = Struct(bb: bb, position: o) }
+
+  public var a: Int16 { return _accessor.readBuffer(of: Int16.self, at: 0) }
+  public var b: Int8 { return _accessor.readBuffer(of: Int8.self, at: 2) }
+}
+
+public struct Vec3: NativeStruct, Verifiable, FlatbuffersInitializable {
+
+  static func validateVersion() { FlatBuffersVersion_2_0_0() }
+
+  private var _x: Float32
+  private var _y: Float32
+  private var _z: Float32
+  private let padding0__: UInt32 = 0
+  private var _test1: Double
+  private var _test2: UInt8
+  private let padding1__: UInt8 = 0
+  private var _test3: Test
+  private let padding2__: UInt16 = 0
+
+  public init(_ bb: ByteBuffer, o: Int32) {
+    let _accessor = Struct(bb: bb, position: o)
+    _x = _accessor.readBuffer(of: Float32.self, at: 0)
+    _y = _accessor.readBuffer(of: Float32.self, at: 4)
+    _z = _accessor.readBuffer(of: Float32.self, at: 8)
+    _test1 = _accessor.readBuffer(of: Double.self, at: 16)
+    _test2 = _accessor.readBuffer(of: UInt8.self, at: 24)
+    _test3 = Test(_accessor.bb, o: _accessor.postion + 26)
+  }
+
+  public init(x: Float32, y: Float32, z: Float32, test1: Double, test2: Color, test3: Test) {
+    _x = x
+    _y = y
+    _z = z
+    _test1 = test1
+    _test2 = test2.value
+    _test3 = test3
+  }
+
+  public init() {
+    _x = 0.0
+    _y = 0.0
+    _z = 0.0
+    _test1 = 0.0
+    _test2 = 0
+    _test3 = Test()
+  }
+
+  public var x: Float32 { _x }
+  public var y: Float32 { _y }
+  public var z: Float32 { _z }
+  public var test1: Double { _test1 }
+  public var test2: Color { Color(rawValue: _test2)! }
+  public var test3: Test { _test3 }
+
+  public static func verify<T>(_ verifier: inout Verifier, at position: Int, of type: T.Type) throws where T: Verifiable {
+    try verifier.inBuffer(position: position, of: Vec3.self)
+  }
+}
+
+extension Vec3: Encodable {
+
+  enum CodingKeys: String, CodingKey {
+    case x = "x"
+    case y = "y"
+    case z = "z"
+    case test1 = "test1"
+    case test2 = "test2"
+    case test3 = "test3"
+  }
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    if x != 0.0 {
+      try container.encodeIfPresent(x, forKey: .x)
+    }
+    if y != 0.0 {
+      try container.encodeIfPresent(y, forKey: .y)
+    }
+    if z != 0.0 {
+      try container.encodeIfPresent(z, forKey: .z)
+    }
+    if test1 != 0.0 {
+      try container.encodeIfPresent(test1, forKey: .test1)
+    }
+    if test2 != .red {
+      try container.encodeIfPresent(test2, forKey: .test2)
+    }
+    try container.encodeIfPresent(test3, forKey: .test3)
+  }
+}
+
+public struct Vec3_Mutable: FlatBufferObject {
+
+  static func validateVersion() { FlatBuffersVersion_2_0_0() }
+  public var __buffer: ByteBuffer! { return _accessor.bb }
+  private var _accessor: Struct
+
+  public init(_ bb: ByteBuffer, o: Int32) { _accessor = Struct(bb: bb, position: o) }
+
+  public var x: Float32 { return _accessor.readBuffer(of: Float32.self, at: 0) }
+  public var y: Float32 { return _accessor.readBuffer(of: Float32.self, at: 4) }
+  public var z: Float32 { return _accessor.readBuffer(of: Float32.self, at: 8) }
+  public var test1: Double { return _accessor.readBuffer(of: Double.self, at: 16) }
+  public var test2: Color { return Color(rawValue: _accessor.readBuffer(of: UInt8.self, at: 24)) ?? .red }
+  public var test3: Test_Mutable { return Test_Mutable(_accessor.bb, o: _accessor.postion + 26) }
+}
+
+///  an example documentation comment: "monster object"
+public struct Monster: FlatBufferObject, Verifiable {
+
+  static func validateVersion() { FlatBuffersVersion_2_0_0() }
+  public var __buffer: ByteBuffer! { return _accessor.bb }
+  private var _accessor: Table
+
+  public static func getRootAsMonster(bb: ByteBuffer) -> Monster { return Monster(Table(bb: bb, position: Int32(bb.read(def: UOffset.self, position: bb.reader)) + Int32(bb.reader))) }
+
+  private init(_ t: Table) { _accessor = t }
+  public init(_ bb: ByteBuffer, o: Int32) { _accessor = Table(bb: bb, position: o) }
+
+  private enum VTOFFSET: VOffset {
+    case pos = 4
+    case mana = 6
+    case hp = 8
+    case name = 10
+    case testarrayoftables = 12
+    case inventory = 14
+    case color = 16
+    var v: Int32 { Int32(self.rawValue) }
+    var p: VOffset { self.rawValue }
+  }
+
+  public var pos: Vec3? { let o = _accessor.offset(VTOFFSET.pos.v); return o == 0 ? nil : _accessor.readBuffer(of: Vec3.self, at: o) }
+  public var mutablePos: Vec3_Mutable? { let o = _accessor.offset(VTOFFSET.pos.v); return o == 0 ? nil : Vec3_Mutable(_accessor.bb, o: o + _accessor.postion) }
+  public var mana: Int16 { let o = _accessor.offset(VTOFFSET.mana.v); return o == 0 ? 150 : _accessor.readBuffer(of: Int16.self, at: o) }
+  public var hp: Int16 { let o = _accessor.offset(VTOFFSET.hp.v); return o == 0 ? 100 : _accessor.readBuffer(of: Int16.self, at: o) }
+  public var name: String! { let o = _accessor.offset(VTOFFSET.name.v); return _accessor.string(at: o) }
+  public var nameSegmentArray: [UInt8]! { return _accessor.getVector(at: VTOFFSET.name.v) }
+  public var testarrayoftablesCount: Int32 { let o = _accessor.offset(VTOFFSET.testarrayoftables.v); return o == 0 ? 0 : _accessor.vector(count: o) }
+  public func testarrayoftables(at index: Int32) -> Monster? { let o = _accessor.offset(VTOFFSET.testarrayoftables.v); return o == 0 ? nil : Monster(_accessor.bb, o: _accessor.indirect(_accessor.vector(at: o) + index * 4)) }
+  public func testarrayoftablesBy(key: String) -> Monster? { let o = _accessor.offset(VTOFFSET.testarrayoftables.v); return o == 0 ? nil : Monster.lookupByKey(vector: _accessor.vector(at: o), key: key, fbb: _accessor.bb) }
+  public var inventoryCount: Int32 { let o = _accessor.offset(VTOFFSET.inventory.v); return o == 0 ? 0 : _accessor.vector(count: o) }
+  public func inventory(at index: Int32) -> UInt8 { let o = _accessor.offset(VTOFFSET.inventory.v); return o == 0 ? 0 : _accessor.directRead(of: UInt8.self, offset: _accessor.vector(at: o) + index * 1) }
+  public var inventory: [UInt8] { return _accessor.getVector(at: VTOFFSET.inventory.v) ?? [] }
+  public var color: Color { let o = _accessor.offset(VTOFFSET.color.v); return o == 0 ? .blue : Color(rawValue: _accessor.readBuffer(of: UInt8.self, at: o)) ?? .blue }
+  public static func startMonster(_ fbb: inout FlatBufferBuilder) -> UOffset { fbb.startTable(with: 7) }
+  public static func add(pos: Vec3?, _ fbb: inout FlatBufferBuilder) { guard let pos = pos else { return }; fbb.create(struct: pos, position: VTOFFSET.pos.p) }
+  public static func add(mana: Int16, _ fbb: inout FlatBufferBuilder) { fbb.add(element: mana, def: 150, at: VTOFFSET.mana.p) }
+  public static func add(hp: Int16, _ fbb: inout FlatBufferBuilder) { fbb.add(element: hp, def: 100, at: VTOFFSET.hp.p) }
+  public static func add(name: Offset, _ fbb: inout FlatBufferBuilder) { fbb.add(offset: name, at: VTOFFSET.name.p) }
+  public static func addVectorOf(testarrayoftables: Offset, _ fbb: inout FlatBufferBuilder) { fbb.add(offset: testarrayoftables, at: VTOFFSET.testarrayoftables.p) }
+  public static func addVectorOf(inventory: Offset, _ fbb: inout FlatBufferBuilder) { fbb.add(offset: inventory, at: VTOFFSET.inventory.p) }
+  public static func add(color: Color, _ fbb: inout FlatBufferBuilder) { fbb.add(element: color.rawValue, def: 8, at: VTOFFSET.color.p) }
+  public static func endMonster(_ fbb: inout FlatBufferBuilder, start: UOffset) -> Offset { let end = Offset(offset: fbb.endTable(at: start)); fbb.require(table: end, fields: [10]); return end }
+  public static func createMonster(
+    _ fbb: inout FlatBufferBuilder,
+    pos: Vec3? = nil,
+    mana: Int16 = 150,
+    hp: Int16 = 100,
+    nameOffset name: Offset = Offset(),
+    testarrayoftablesVectorOffset testarrayoftables: Offset = Offset(),
+    inventoryVectorOffset inventory: Offset = Offset(),
+    color: Color = .blue
+  ) -> Offset {
+    let __start = Monster.startMonster(&fbb)
+    Monster.add(pos: pos, &fbb)
+    Monster.add(mana: mana, &fbb)
+    Monster.add(hp: hp, &fbb)
+    Monster.add(name: name, &fbb)
+    Monster.addVectorOf(testarrayoftables: testarrayoftables, &fbb)
+    Monster.addVectorOf(inventory: inventory, &fbb)
+    Monster.add(color: color, &fbb)
+    return Monster.endMonster(&fbb, start: __start)
+  }
+  public static func sortVectorOfMonster(offsets:[Offset], _ fbb: inout FlatBufferBuilder) -> Offset {
+    var off = offsets
+    off.sort { Table.compare(Table.offset(Int32($1.o), vOffset: 10, fbb: fbb.buffer), Table.offset(Int32($0.o), vOffset: 10, fbb: fbb.buffer), fbb: fbb.buffer) < 0 } 
+    return fbb.createVector(ofOffsets: off)
+  }
+  fileprivate static func lookupByKey(vector: Int32, key: String, fbb: ByteBuffer) -> Monster? {
+    let key = key.utf8.map { $0 }
+    var span = fbb.read(def: Int32.self, position: Int(vector - 4))
+    var start: Int32 = 0
+    while span != 0 {
+      var middle = span / 2
+      let tableOffset = Table.indirect(vector + 4 * (start + middle), fbb)
+      let comp = Table.compare(Table.offset(Int32(fbb.capacity) - tableOffset, vOffset: 10, fbb: fbb), key, fbb: fbb)
+      if comp > 0 {
+        span = middle
+      } else if comp < 0 {
+        middle += 1
+        start += middle
+        span -= middle
+      } else {
+        return Monster(fbb, o: tableOffset)
+      }
+    }
+    return nil
+  }
+
+  public static func verify<T>(_ verifier: inout Verifier, at position: Int, of type: T.Type) throws where T: Verifiable {
+    var _v = try verifier.visitTable(at: position)
+    try _v.visit(field: VTOFFSET.pos.p, fieldName: "pos", required: false, type: Vec3.self)
+    try _v.visit(field: VTOFFSET.mana.p, fieldName: "mana", required: false, type: Int16.self)
+    try _v.visit(field: VTOFFSET.hp.p, fieldName: "hp", required: false, type: Int16.self)
+    try _v.visit(field: VTOFFSET.name.p, fieldName: "name", required: true, type: ForwardOffset<String>.self)
+    try _v.visit(field: VTOFFSET.testarrayoftables.p, fieldName: "testarrayoftables", required: false, type: ForwardOffset<Vector<ForwardOffset<Monster>, Monster>>.self)
+    try _v.visit(field: VTOFFSET.inventory.p, fieldName: "inventory", required: false, type: ForwardOffset<Vector<UInt8, UInt8>>.self)
+    try _v.visit(field: VTOFFSET.color.p, fieldName: "color", required: false, type: Color.self)
+    _v.finish()
+  }
+}
+
+extension Monster: Encodable {
+
+  enum CodingKeys: String, CodingKey {
+    case pos = "pos"
+    case mana = "mana"
+    case hp = "hp"
+    case name = "name"
+    case testarrayoftables = "testarrayoftables"
+    case inventory = "inventory"
+    case color = "color"
+  }
+  public func encode(to encoder: Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    try container.encodeIfPresent(pos, forKey: .pos)
+    if mana != 150 {
+      try container.encodeIfPresent(mana, forKey: .mana)
+    }
+    if hp != 100 {
+      try container.encodeIfPresent(hp, forKey: .hp)
+    }
+    try container.encodeIfPresent(name, forKey: .name)
+    if testarrayoftablesCount > 0 {
+      var contentEncoder = container.nestedUnkeyedContainer(forKey: .testarrayoftables)
+      for index in 0..<testarrayoftablesCount {
+        guard let type = testarrayoftables(at: index) else { continue }
+        try contentEncoder.encode(type)
+      }
+    }
+    if inventoryCount > 0 {
+      try container.encodeIfPresent(inventory, forKey: .inventory)
+    }
+    if color != .blue {
+      try container.encodeIfPresent(color, forKey: .color)
+    }
+  }
+}
+
diff --git a/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/main.swift b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/main.swift
index 7a3ff66..86e422c 100644
--- a/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/main.swift
+++ b/tests/FlatBuffers.Test.Swift/Sources/SwiftFlatBuffers/main.swift
@@ -1,5 +1,5 @@
 /*
- * Copyright 2020 Google Inc. All rights reserved.
+ * Copyright 2021 Google Inc. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,5 +14,16 @@
  * limitations under the License.
  */
 
-import Foundation
-print("Flatbuffers")
+import FlatBuffers
+
+@_cdecl("LLVMFuzzerTestOneInput")
+public func FuzzFlatbuffers(_ start: UnsafeRawPointer, _ count: Int) -> CInt {
+  let bytes = UnsafeRawBufferPointer(start: start, count: count)
+  do {
+    var buffer = ByteBuffer(contiguousBytes: bytes, count: count)
+    let _: Monster = try getCheckedRoot(byteBuffer: &buffer)
+  } catch {
+  }
+
+  return 0
+}