diff --git a/README.md b/README.md
index 1e1e6bb..3c88743 100644
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ import PackageDescription
 let package = Package(
   name: "SomeProject",
   dependencies: [
-    .package(url: "https://github.com/dankinsoid/swift-api-client.git", from: "0.42.0")
+    .package(url: "https://github.com/dankinsoid/swift-api-client.git", from: "0.43.0")
   ],
   targets: [
     .target(
diff --git a/Sources/SwiftAPIClient/APIClientConfigs.swift b/Sources/SwiftAPIClient/APIClientConfigs.swift
index 1149af8..2de8c05 100644
--- a/Sources/SwiftAPIClient/APIClientConfigs.swift
+++ b/Sources/SwiftAPIClient/APIClientConfigs.swift
@@ -67,5 +67,42 @@ public func valueFor<Value>(
 	#endif
 }
 
-private let _XCTIsTesting: Bool = ProcessInfo.processInfo.environment.keys.contains("XCTestBundlePath")
-private let _isPreview: Bool = ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"
+public let _isPreview: Bool = ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"
+
+#if !os(WASI)
+public let _XCTIsTesting: Bool = {
+    ProcessInfo.processInfo.environment.keys.contains("XCTestBundlePath")
+    || ProcessInfo.processInfo.environment.keys.contains("XCTestConfigurationFilePath")
+    || ProcessInfo.processInfo.environment.keys.contains("XCTestSessionIdentifier")
+    || (ProcessInfo.processInfo.arguments.first
+        .flatMap(URL.init(fileURLWithPath:))
+        .map { $0.lastPathComponent == "xctest" || $0.pathExtension == "xctest" }
+        ?? false)
+    || XCTCurrentTestCase != nil
+}()
+#else
+public let _XCTIsTesting = false
+#endif
+
+#if canImport(ObjectiveC)
+private var XCTCurrentTestCase: AnyObject? {
+    guard
+        let XCTestObservationCenter = NSClassFromString("XCTestObservationCenter"),
+        let XCTestObservationCenter = XCTestObservationCenter as Any as? NSObjectProtocol,
+        let shared = XCTestObservationCenter.perform(Selector(("sharedTestObservationCenter")))?
+            .takeUnretainedValue(),
+        let observers = shared.perform(Selector(("observers")))?
+            .takeUnretainedValue() as? [AnyObject],
+        let observer =
+            observers
+            .first(where: { NSStringFromClass(type(of: $0)) == "XCTestMisuseObserver" }),
+        let currentTestCase = observer.perform(Selector(("currentTestCase")))?
+            .takeUnretainedValue()
+    else { return nil }
+    return currentTestCase
+}
+#else
+private var XCTCurrentTestCase: AnyObject? {
+    nil
+}
+#endif