diff --git a/Tests/SwiftyChronoTests/ChronoJSXCTestCase.swift b/Tests/SwiftyChronoTests/ChronoJSXCTestCase.swift
index 8f04cd5..f6efc25 100644
--- a/Tests/SwiftyChronoTests/ChronoJSXCTestCase.swift
+++ b/Tests/SwiftyChronoTests/ChronoJSXCTestCase.swift
@@ -32,6 +32,17 @@ public class ChronoJSXCTestCase: XCTestCase, ChronoJSTestable {
         jsContext.evaluateScript(script)
     }
     
+    public func resourcePath(testCasePath: String = #file, name: String, type: String) -> String {
+        if let bundle = Bundle(identifier: "io.quire.lib.SwiftyChrono"), let path = bundle.path(forResource: name, ofType: type) {
+            return path
+        } else {
+            // bundle does not exist (expect that if you regenerated SwiftyChrono.xcodeproj with SPM)
+            // assume resource is in the same folder than the test case source file
+            let folder = testCasePath.components(separatedBy: "/").dropLast().joined(separator: "/")
+            return "\(folder)/\(name).\(type)"
+        }
+    }
+
     override public func setUp() {
         super.setUp()
         
diff --git a/Tests/SwiftyChronoTests/JS/de/TestDE.swift b/Tests/SwiftyChronoTests/JS/de/TestDE.swift
index 87c1a0f..157653c 100644
--- a/Tests/SwiftyChronoTests/JS/de/TestDE.swift
+++ b/Tests/SwiftyChronoTests/JS/de/TestDE.swift
@@ -25,7 +25,7 @@ class TestDE: ChronoJSXCTestCase {
         Chrono.sixMinutesFixBefore1900 = true
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }
diff --git a/Tests/SwiftyChronoTests/JS/en/TestEN.swift b/Tests/SwiftyChronoTests/JS/en/TestEN.swift
index 8bc305e..0125221 100644
--- a/Tests/SwiftyChronoTests/JS/en/TestEN.swift
+++ b/Tests/SwiftyChronoTests/JS/en/TestEN.swift
@@ -33,7 +33,7 @@ class TestEN: ChronoJSXCTestCase {
         Chrono.preferredLanguage = .english
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }
diff --git a/Tests/SwiftyChronoTests/JS/es/TestES.swift b/Tests/SwiftyChronoTests/JS/es/TestES.swift
index 46a3c33..b09ce9a 100644
--- a/Tests/SwiftyChronoTests/JS/es/TestES.swift
+++ b/Tests/SwiftyChronoTests/JS/es/TestES.swift
@@ -24,7 +24,7 @@ class TestES: ChronoJSXCTestCase {
         Chrono.sixMinutesFixBefore1900 = true
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }
diff --git a/Tests/SwiftyChronoTests/JS/fr/TestFR.swift b/Tests/SwiftyChronoTests/JS/fr/TestFR.swift
index e76ba1a..0622ec8 100644
--- a/Tests/SwiftyChronoTests/JS/fr/TestFR.swift
+++ b/Tests/SwiftyChronoTests/JS/fr/TestFR.swift
@@ -25,7 +25,7 @@ class TestFR: ChronoJSXCTestCase {
         Chrono.sixMinutesFixBefore1900 = true
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }
diff --git a/Tests/SwiftyChronoTests/JS/jp/TestJP.swift b/Tests/SwiftyChronoTests/JS/jp/TestJP.swift
index c173255..2e26f23 100644
--- a/Tests/SwiftyChronoTests/JS/jp/TestJP.swift
+++ b/Tests/SwiftyChronoTests/JS/jp/TestJP.swift
@@ -19,7 +19,7 @@ class TestJP: ChronoJSXCTestCase {
         Chrono.sixMinutesFixBefore1900 = true
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }
diff --git a/Tests/SwiftyChronoTests/JS/zh_hans/TestZHHans.swift b/Tests/SwiftyChronoTests/JS/zh_hans/TestZHHans.swift
index bef248d..bf0fdc2 100644
--- a/Tests/SwiftyChronoTests/JS/zh_hans/TestZHHans.swift
+++ b/Tests/SwiftyChronoTests/JS/zh_hans/TestZHHans.swift
@@ -24,7 +24,7 @@ class TestZHHans: ChronoJSXCTestCase {
 		Chrono.sixMinutesFixBefore1900 = true
 		
 		for fileName in files {
-			let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
 			evalJS(js, fileName: fileName)
 		}
 	}
diff --git a/Tests/SwiftyChronoTests/JS/zh_hant/testZHHant.swift b/Tests/SwiftyChronoTests/JS/zh_hant/testZHHant.swift
index c5b6a6c..f69329d 100644
--- a/Tests/SwiftyChronoTests/JS/zh_hant/testZHHant.swift
+++ b/Tests/SwiftyChronoTests/JS/zh_hant/testZHHant.swift
@@ -24,7 +24,7 @@ class TestZHHant: ChronoJSXCTestCase {
         Chrono.sixMinutesFixBefore1900 = true
         
         for fileName in files {
-            let js = try! String(contentsOfFile: Bundle(identifier: "io.quire.lib.SwiftyChrono")!.path(forResource: fileName, ofType: "js")!)
+            let js = try! String(contentsOfFile: resourcePath(name: fileName, type: "js"))
             evalJS(js, fileName: fileName)
         }
     }