unit testing problem with ICache

    System.NotSupportedException : Unsupported expression: cache => cache.TryGetValue<Customer>("pendingCustomer", testCustomer)
Extension methods (here: CacheExtensions.TryGetValue) may not be used in setup / verification expressions.

 [Fact]
 public async Task VerifyEmailAndCreateAccount_ValidCode_CreatesCustomerAccount()
 {

     // Arrange

     var testCustomer = _testCustomer;
     string verificationCode = "123456";

     var emailVerification = new EmailVerification
     {
         Email = testCustomer.Email,
         Code = "123456" 
     };

     // Setup the cache mock to return a valid customer and verification code
     _mockMemoryCache.Setup(cache => cache.TryGetValue("pendingCustomer", out testCustomer))
         .Returns(true);
     _mockMemoryCache.Setup(cache => cache.TryGetValue("verificationCode", out verificationCode))
         .Returns(true);

     // Act: Call the API method
     var result = await _controller.VerifyEmailAndCreateAccount(emailVerification);

     // Assert
     var okResult = Assert.IsType<OkObjectResult>(result);
     Assert.Equal("Email successfully verified and account created.", okResult.Value);
 }