Try alternative test implementations

FirebaseVertexAI/Tests/Unit/PartsRepresentableTests.swift

@@ -73,35 +73,45 @@ final class PartsRepresentableTests: XCTestCase {
     XCTFail("Expected model content from invlaid image to error")
   }
 
-  #if canImport(UIKit) && !os(visionOS) // These tests are stalling in CI on visionOS.
-    func testModelContentFromInvalidUIImageThrows() throws {
+  #if canImport(UIKit)
+    func testModelContentFromInvalidUIImageThrows() {
+      print("Instantiating UIImage.")
       let image = UIImage()
       do {
+        print("Getting image parts.")
         _ = try image.tryPartsValue()
+        XCTFail("Expected ImageConversionError.couldNotConvertToJPEG; no error.")
+      } catch let ImageConversionError.couldNotConvertToJPEG(source as UIImage) {
+        print("Checking image equality.")
+        XCTAssertEqual(source, image)
       } catch {
-        guard let imageError = (error as? ImageConversionError) else {
-          XCTFail("Got unexpected error type: \(error)")
-          return
-        }
-        switch imageError {
-        case let .couldNotConvertToJPEG(source):
-          // String(describing:) works around a type error.
-          XCTAssertEqual(String(describing: source), String(describing: image))
-          return
-        case _:
-          XCTFail("Expected image conversion error, got \(imageError) instead")
-          return
-        }
+        XCTFail("Expected ImageConversionError.couldNotConvertToJPEG; error thrown: \(error)")
       }
-      XCTFail("Expected model content from invlaid image to error")
+      print("Done testModelContentFromInvalidUIImageThrows.")
     }
 
-    func testModelContentFromUIImageIsNotEmpty() throws {
-      let coreImage = CIImage(color: CIColor.red)
-        .cropped(to: CGRect(origin: CGPointZero, size: CGSize(width: 16, height: 16)))
-      let image = UIImage(ciImage: coreImage)
-      let modelContent = try image.tryPartsValue()
-      XCTAssert(modelContent.count > 0, "Expected non-empty model content for UIImage: \(image)")
+    func testModelContentFromUIImageIsNotEmpty() {
+      print("Creating UIImage with systemName.")
+      guard let image = UIImage(systemName: "photo") else {
+        XCTFail("Failed to create UIImage with system name.")
+        return
+      }
+      print("Getting image parts.")
+      let modelContent: [ModelContent.Part]
+      do {
+        modelContent = try image.tryPartsValue()
+        print("Got image parts.")
+      } catch {
+        XCTFail("Getting image parts failed with error: \(error)")
+        return
+      }
+      print("Checking content part count.")
+      XCTAssertEqual(
+        modelContent.count,
+        1,
+        "Expected non-empty model content for UIImage: \(image)"
+      )
+      print("Done testModelContentFromUIImageIsNotEmpty.")
     }
 
   #elseif canImport(AppKit)