Generated Project

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj

Package.swift

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+// swift-tools-version:4.0
+import PackageDescription
+let package = Package(
+    name: "APIErrorMiddleware",
+    products: [
+        .library(name: "APIErrorMiddleware", targets: ["APIErrorMiddleware"]),
+    ],
+    dependencies: [
+    ],
+    targets: [
+        .target(name: "APIErrorMiddleware", dependencies: []),
+        .testTarget(name: "APIErrorMiddlewareTests", dependencies: ["APIErrorMiddleware"]),
+    ]
+)

README.md

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+# APIErrorMiddleware
+
+A description of this package.

Sources/APIErrorMiddleware/APIErrorMiddleware.swift

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+struct APIErrorMiddleware {
+    var text = "Hello, World!"
+}

Tests/APIErrorMiddlewareTests/APIErrorMiddlewareTests.swift

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+import XCTest
+@testable import APIErrorMiddleware
+
+final class APIErrorMiddlewareTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(APIErrorMiddleware().text, "Hello, World!")
+    }
+
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Tests/APIErrorMiddlewareTests/XCTestManifests.swift

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+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(APIErrorMiddlewareTests.allTests),
+    ]
+}
+#endif

Tests/LinuxMain.swift

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+import XCTest
+
+import APIErrorMiddlewareTests
+
+var tests = [XCTestCaseEntry]()
+tests += APIErrorMiddlewareTests.allTests()
+XCTMain(tests)