Fix App named app-check-not-configured has already been configured error

Author: andrewheard

FirebaseVertexAI/Tests/TestApp/Sources/FirebaseAppUtils.swift

@@ -15,7 +15,16 @@
 import FirebaseCore
 
 extension FirebaseApp {
+  /// Configures a Firebase app with the specified name and Google Service Info plist file name.
+  ///
+  /// - Parameters:
+  ///   - appName: The Firebase app's name; see ``FirebaseAppNames`` for app names with special
+  ///     meanings in the TestApp.
+  ///   - plistName: The file name of the Google Service Info plist, excluding the file extension;
+  ///     for the default app this is typically called `GoogleService-Info` but any file name may be
+  ///     used for other apps.
   static func configure(appName: String, plistName: String) {
+    assert(!plistName.hasSuffix(".plist"), "The .plist file extension must be omitted.")
     guard let plistPath =
       Bundle.main.path(forResource: plistName, ofType: "plist") else {
       fatalError("The file '\(plistName).plist' was not found.")

FirebaseVertexAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

@@ -185,7 +185,7 @@ struct GenerateContentIntegrationTests {
         return false
       }
       guard case let .internalError(underlyingError) = error else {
-        Issue.record("Expected a \(GenerateContentError.internalError.self); got \(error.self).")
+        Issue.record("Expected a GenerateContentError.internalError(...); got \(error.self).")
         return false
       }
 

FirebaseVertexAI/Tests/TestApp/Tests/Integration/IntegrationTests.swift

@@ -229,8 +229,7 @@ final class IntegrationTests: XCTestCase {
   }
 
   func testCountTokens_appCheckNotConfigured_shouldFail() async throws {
-    let app = try FirebaseApp.defaultNamedCopy(name: FirebaseAppNames.appCheckNotConfigured)
-    addTeardownBlock { await app.delete() }
+    let app = try XCTUnwrap(FirebaseApp.app(name: FirebaseAppNames.appCheckNotConfigured))
     let vertex = VertexAI.vertexAI(app: app)
     let model = vertex.generativeModel(modelName: "gemini-2.0-flash")
     let prompt = "Why is the sky blue?"

FirebaseVertexAI/Tests/TestApp/Tests/Utilities/FirebaseAppTestUtils.swift

@@ -21,7 +21,6 @@
 		8692F29A2CC9477800539E8F /* FirebaseAuth in Frameworks */ = {isa = PBXBuildFile; productRef = 8692F2992CC9477800539E8F /* FirebaseAuth */; };
 		8692F29C2CC9477800539E8F /* FirebaseStorage in Frameworks */ = {isa = PBXBuildFile; productRef = 8692F29B2CC9477800539E8F /* FirebaseStorage */; };
 		8692F29E2CC9477800539E8F /* FirebaseVertexAI in Frameworks */ = {isa = PBXBuildFile; productRef = 8692F29D2CC9477800539E8F /* FirebaseVertexAI */; };
-		8698D7462CD3CF3600ABA833 /* FirebaseAppTestUtils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8698D7452CD3CF2F00ABA833 /* FirebaseAppTestUtils.swift */; };
 		8698D7482CD4332B00ABA833 /* TestAppCheckProviderFactory.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8698D7472CD4332B00ABA833 /* TestAppCheckProviderFactory.swift */; };
 		86CC31352D91EE9E0087E964 /* FirebaseAppUtils.swift in Sources */ = {isa = PBXBuildFile; fileRef = 86CC31342D91EE9E0087E964 /* FirebaseAppUtils.swift */; };
 		86D77DFC2D7A5340003D155D /* GenerateContentIntegrationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 86D77DFB2D7A5340003D155D /* GenerateContentIntegrationTests.swift */; };
@@ -54,7 +53,6 @@
 		868A7C502CCC263300E449DD /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
 		868A7C532CCC26B500E449DD /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		868A7C552CCC271300E449DD /* TestApp.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = TestApp.entitlements; sourceTree = "<group>"; };
-		8698D7452CD3CF2F00ABA833 /* FirebaseAppTestUtils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FirebaseAppTestUtils.swift; sourceTree = "<group>"; };
 		8698D7472CD4332B00ABA833 /* TestAppCheckProviderFactory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestAppCheckProviderFactory.swift; sourceTree = "<group>"; };
 		86CC31342D91EE9E0087E964 /* FirebaseAppUtils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FirebaseAppUtils.swift; sourceTree = "<group>"; };
 		86D77DFB2D7A5340003D155D /* GenerateContentIntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GenerateContentIntegrationTests.swift; sourceTree = "<group>"; };
@@ -161,7 +159,6 @@
 			isa = PBXGroup;
 			children = (
 				86D77E032D7B6C95003D155D /* InstanceConfig.swift */,
-				8698D7452CD3CF2F00ABA833 /* FirebaseAppTestUtils.swift */,
 				862218802D04E08D007ED2D4 /* IntegrationTestUtils.swift */,
 			);
 			path = Utilities;
@@ -292,7 +289,6 @@
 			files = (
 				8689CDCC2D7F8BD700BF426B /* CountTokensIntegrationTests.swift in Sources */,
 				86D77E042D7B6C9D003D155D /* InstanceConfig.swift in Sources */,
-				8698D7462CD3CF3600ABA833 /* FirebaseAppTestUtils.swift in Sources */,
 				868A7C4F2CCC229F00E449DD /* Credentials.swift in Sources */,
 				864F8F712D4980DD0002EA7E /* ImagenIntegrationTests.swift in Sources */,
 				862218812D04E098007ED2D4 /* IntegrationTestUtils.swift in Sources */,