Incorporate type name into failure message.

Package@swift-5.9.swift

@@ -94,6 +94,7 @@ let package = Package(
     .testTarget(
       name: "DependenciesMacrosPluginTests",
       dependencies: [
+        "DependenciesMacros",
         "DependenciesMacrosPlugin",
         .product(name: "MacroTesting", package: "swift-macro-testing"),
       ]

Sources/DependenciesMacrosPlugin/DependencyEndpointMacro.swift

@@ -123,9 +123,9 @@ public enum DependencyEndpointMacro: AccessorMacro, PeerMacro {
       }
     }
     unimplementedDefault.statements.insert(
-      """
-      XCTestDynamicOverlay.XCTFail("Unimplemented: '\(raw: unescapedIdentifier)'")
-      """,
+      #"""
+      XCTestDynamicOverlay.XCTFail("Unimplemented: '\(Self.self).\#(raw: unescapedIdentifier)'")
+      """#,
       at: unimplementedDefault.statements.startIndex
     )
     for index in unimplementedDefault.statements.indices {

Tests/DependenciesMacrosPluginTests/DependencyClientMacroTests.swift

@@ -709,7 +709,7 @@ final class DependencyClientMacroTests: BaseTestCase {
       }
       """
     } expansion: {
-      """
+      #"""
       struct Client {@available(iOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(macOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(tvOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(watchOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.")
         var fetch: (_ id: Int) throws -> String {
           @storageRestrictions(initializes: _fetch)
@@ -729,7 +729,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         }
 
         @available(iOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(macOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(tvOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(watchOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") private var _fetch: (_ id: Int) throws -> String = { _ in
-          XCTestDynamicOverlay.XCTFail("Unimplemented: 'fetch'")
+          XCTestDynamicOverlay.XCTFail("Unimplemented: '\(Self.self).fetch'")
           throw DependenciesMacros.Unimplemented("fetch")
         }
 
@@ -742,7 +742,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         init() {
         }
       }
-      """
+      """#
     }
   }
 
@@ -756,7 +756,7 @@ final class DependencyClientMacroTests: BaseTestCase {
       }
       """
     } expansion: {
-      """
+      #"""
       struct Client {
         @available(iOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(macOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(tvOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(watchOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.")
         var fetch: (_ id: Int) throws -> String {
@@ -777,7 +777,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         }
 
         @available(iOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(macOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(tvOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") @available(watchOS, deprecated: 9999, message: "This property has a method equivalent that is preferred for autocomplete via this deprecation. It is perfectly fine to use for overriding and accessing via '@Dependency'.") private var _fetch: (_ id: Int) throws -> String = { _ in
-          XCTestDynamicOverlay.XCTFail("Unimplemented: 'fetch'")
+          XCTestDynamicOverlay.XCTFail("Unimplemented: '\(Self.self).fetch'")
           throw DependenciesMacros.Unimplemented("fetch")
         }
 
@@ -790,7 +790,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         init() {
         }
       }
-      """
+      """#
     }
   }
 
@@ -803,7 +803,7 @@ final class DependencyClientMacroTests: BaseTestCase {
       }
       """
     } expansion: {
-      """
+      #"""
       struct Client {
         var fetch: (Int) throws -> String {
           @storageRestrictions(initializes: _fetch)
@@ -819,7 +819,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         }
 
         private var _fetch: (Int) throws -> String = { _ in
-          XCTestDynamicOverlay.XCTFail("Unimplemented: 'fetch'")
+          XCTestDynamicOverlay.XCTFail("Unimplemented: '\(Self.self).fetch'")
           throw DependenciesMacros.Unimplemented("fetch")
         }
 
@@ -832,7 +832,7 @@ final class DependencyClientMacroTests: BaseTestCase {
         init() {
         }
       }
-      """
+      """#
     }
   }
 

Tests/DependenciesMacrosPluginTests/DependencyClientTests.swift

@@ -0,0 +1,53 @@
+#if canImport(ObjectiveC)
+import DependenciesMacros
+import XCTest
+
+final class DependencyClientTests: BaseTestCase {
+  func testUnimplementedEndpoint() throws {
+    let client = Client()
+
+    XCTExpectFailure {
+      $0.compactDescription == """
+        Unimplemented: 'Client.fetch'
+        """
+    }
+
+    do {
+      let _ = try client.fetch()
+      XCTFail("Client.fetch should throw an error.")
+    } catch {
+    }
+  }
+
+  func testSwiftBug() {
+    let client = ClientWithNonThrowingEndpoint()
+
+    // NB: This should cause a test failure but currently does not due to a Swift compiler bug:
+    //     https://github.com/apple/swift/issues/71070
+    XCTAssertEqual(client.fetch(), 42)
+
+    XCTExpectFailure {
+      XCTAssertEqual(client.fetchWithUnimplemented(), 42)
+    } issueMatcher: {
+      $0.compactDescription == """
+        Unimplemented …
+
+          Defined at:
+            DependenciesMacrosPluginTests/DependencyClientTests.swift:\(ClientWithNonThrowingEndpoint.line + 1)
+        """
+    }
+  }
+}
+
+@DependencyClient
+struct Client {
+  var fetch: () throws -> Int
+}
+
+@DependencyClient
+struct ClientWithNonThrowingEndpoint {
+  var fetch: () -> Int = { 42 }
+  static let line = #line
+  var fetchWithUnimplemented: () -> Int = { unimplemented(placeholder: 42) }
+}
+#endif