diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
new file mode 100644
index 0000000..7219c22
--- /dev/null
+++ b/.github/workflows/swift.yml
@@ -0,0 +1,22 @@
+name: Swift
+
+on:
+  push:
+    branches: [ "develop" ]
+  pull_request:
+    branches: [ "develop" ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup Swift
+      uses: fwal/setup-swift@v2
+      with:
+        swift-version: '6.0.0'
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v
diff --git a/README.md b/README.md
index 2b9dce5..9d0b5d3 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,10 @@
 # EasyMock
 
-**Simulate. Test. Verify.**  
-A lightweight and expressive library for unit testing in Swift — supporting `async/await`, delays, error simulation, and call tracking.
+[![Swift](https://github.com/EasyPackages/EasyMock/actions/workflows/swift.yml/badge.svg)](https://github.com/EasyPackages/EasyMock/actions/workflows/swift.yml)
+
+## Simulate. Test. Verify
 
----
+A lightweight and expressive library for unit testing in Swift — supporting `async/await`, delays, error simulation, and call tracking.
 
 ## Overview
 
@@ -19,8 +20,6 @@ It’s ideal for testing interactions, async flows, and error handling — witho
 - ❗ Error simulation (`throw`)
 - 🧪 Designed for clarity in unit tests
 
----
-
 ## Why Use EasyMock?
 
 ### Replace This:
@@ -61,8 +60,6 @@ struct AuthenticatorMock: Authenticator {
 }
 ```
 
----
-
 ## Installation
 
 ### Using Swift Package Manager
@@ -87,19 +84,6 @@ In your target:
 )
 ```
 
----
-
-## Library Structure
-
-| Type               | Name                  | Purpose                                |
-|--------------------|-----------------------|----------------------------------------|
-| Mock               | `Mock`                | Basic sync mock                        |
-| AsyncMock          | `AsyncMock`           | Mock with `async/await`                |
-| ThrowableMock      | `ThrowableMock`       | Mock that can simulate thrown errors   |
-| AsyncThrowableMock | `AsyncThrowableMock`  | Full-featured async mock with error and delay support |
-
----
-
 ## Examples
 
 ### Basic Mock
@@ -144,16 +128,12 @@ let value = try await asyncMock.synchronize("ping")
 XCTAssertEqual(value, 42)
 ```
 
----
-
 ## Supported Platforms
 
 - iOS 13+
 - macOS 10.15+
 - Swift 5.9+
 
----
-
 ## Author
 
 Created by [Paolo Prodossimo Lopes](https://github.com/PaoloProdossimoLopes)  
diff --git a/Tests/EasyMockTests/AsyncMockTests.swift b/Tests/EasyMockTests/AsyncMockTests.swift
index 15cb33a..be6c133 100644
--- a/Tests/EasyMockTests/AsyncMockTests.swift
+++ b/Tests/EasyMockTests/AsyncMockTests.swift
@@ -154,6 +154,7 @@ struct AsyncMockTests {
     @Test("should wait for the configured delay before completing")
     func testsynchronizeAppliesDelay() async {
         let delay = 0.2
+        let tolerance = 0.05
         let clock = ContinuousClock()
         let start = clock.now
         let sut = makeSut()
@@ -162,8 +163,13 @@ struct AsyncMockTests {
         await sut.synchronize("any-input")
 
         let duration = start.duration(to: clock.now)
-        #expect(duration >= .seconds(delay))
-        #expect(duration <= .seconds(delay + (delay * 0.1)))
+        let minimumExpected = delay
+        let maximumExpected = delay + tolerance
+
+        #expect(
+            duration >= .seconds(minimumExpected) && duration <= .seconds(maximumExpected),
+            "Duration (\(duration)) was not within the expected range (\(minimumExpected)s to \(maximumExpected)s)"
+        )
     }
     
     @Test("should not trigger observers when mocking delay")
diff --git a/Tests/EasyMockTests/AsyncThrowableMockTests.swift b/Tests/EasyMockTests/AsyncThrowableMockTests.swift
index 2d4778a..1100935 100644
--- a/Tests/EasyMockTests/AsyncThrowableMockTests.swift
+++ b/Tests/EasyMockTests/AsyncThrowableMockTests.swift
@@ -192,6 +192,7 @@ struct AsyncThrowableMockTests {
     @Test("should wait for the configured delay before completing")
     func testsynchronizeAppliesDelay() async throws {
         let delay = 0.2
+        let tolerance = 0.05
         let clock = ContinuousClock()
         let start = clock.now
         let sut = makeSut()
@@ -200,8 +201,13 @@ struct AsyncThrowableMockTests {
         try await sut.synchronize("any-input")
 
         let duration = start.duration(to: clock.now)
-        #expect(duration >= .seconds(delay))
-        #expect(duration <= .seconds(delay + (delay * 0.1)))
+        let minimumExpected = delay
+        let maximumExpected = delay + tolerance
+
+        #expect(
+            duration >= .seconds(minimumExpected) && duration <= .seconds(maximumExpected),
+            "Duration (\(duration)) was not within the expected range (\(minimumExpected)s to \(maximumExpected)s)"
+        )
     }
     
     @Test("should not trigger observers when mocking delay")