Address Analyzer Warnings (#2078)

* Address potential errors

* Add tests

* Add clarity

* Run formatting

test/Api.Test/Models/Request/Accounts/PremiumRequestModelTests.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using Bit.Api.Models.Request.Accounts;
+using Bit.Core.Settings;
+using Microsoft.AspNetCore.Http;
+using Xunit;
+
+namespace Bit.Api.Test.Models.Request.Accounts
+{
+    public class PremiumRequestModelTests
+    {
+        public static IEnumerable<object[]> GetValidateData()
+        {
+            // 1. selfHosted
+            // 2. formFile
+            // 3. country
+            // 4. expected
+
+            yield return new object[] { true, null, null, false };
+            yield return new object[] { true, null, "US", false };
+            yield return new object[] { true, new NotImplementedFormFile(), null, false };
+            yield return new object[] { true, new NotImplementedFormFile(), "US", false };
+
+            yield return new object[] { false, null, null, false };
+            yield return new object[] { false, null, "US", true }; // Only true, cloud with null license AND a Country
+            yield return new object[] { false, new NotImplementedFormFile(), null, false };
+            yield return new object[] { false, new NotImplementedFormFile(), "US", false };
+        }
+
+        [Theory]
+        [MemberData(nameof(GetValidateData))]
+        public void Validate_Success(bool selfHosted, IFormFile formFile, string country, bool expected)
+        {
+            var gs = new GlobalSettings
+            {
+                SelfHosted = selfHosted
+            };
+
+            var sut = new PremiumRequestModel
+            {
+                License = formFile,
+                Country = country,
+            };
+
+            Assert.Equal(expected, sut.Validate(gs));
+        }
+    }
+
+    public class NotImplementedFormFile : IFormFile
+    {
+        public string ContentType => throw new NotImplementedException();
+
+        public string ContentDisposition => throw new NotImplementedException();
+
+        public IHeaderDictionary Headers => throw new NotImplementedException();
+
+        public long Length => throw new NotImplementedException();
+
+        public string Name => throw new NotImplementedException();
+
+        public string FileName => throw new NotImplementedException();
+
+        public void CopyTo(Stream target) => throw new NotImplementedException();
+        public Task CopyToAsync(Stream target, CancellationToken cancellationToken = default) => throw new NotImplementedException();
+        public Stream OpenReadStream() => throw new NotImplementedException();
+    }
+}

test/Core.Test/Models/Business/BillingInfo.cs

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+using Bit.Core.Models.Business;
+using Xunit;
+
+namespace Bit.Core.Test.Models.Business
+{
+    public class BillingInfoTests
+    {
+        [Fact]
+        public void BillingInvoice_Amount_ShouldComeFrom_InvoiceTotal()
+        {
+            var invoice = new Stripe.Invoice
+            {
+                AmountDue = 1000,
+                Total = 2000,
+            };
+
+            var billingInvoice = new BillingInfo.BillingInvoice(invoice);
+
+            // Should have been set from Total
+            Assert.Equal(20M, billingInvoice.Amount);
+        }
+    }
+}

test/Core.Test/Services/AppleIapServiceTests.cs

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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Bit.Core.Services;
+using Bit.Test.Common.AutoFixture;
+using Bit.Test.Common.AutoFixture.Attributes;
+using Microsoft.Extensions.Logging;
+using NSubstitute;
+using NSubstitute.Core;
+using Xunit;
+
+namespace Bit.Core.Test.Services
+{
+    [SutProviderCustomize]
+    public class AppleIapServiceTests
+    {
+        [Theory, BitAutoData]
+        public async Task GetReceiptStatusAsync_MoreThanFourAttempts_Throws(SutProvider<AppleIapService> sutProvider)
+        {
+            var result = await sutProvider.Sut.GetReceiptStatusAsync("test", false, 5, null);
+            Assert.Null(result);
+
+            var errorLog = sutProvider.GetDependency<ILogger<AppleIapService>>()
+                .ReceivedCalls()
+                .SingleOrDefault(LogOneWarning);
+
+            Assert.True(errorLog != null, "Must contain one error log of warning level containing 'null'");
+
+            static bool LogOneWarning(ICall call)
+            {
+                if (call.GetMethodInfo().Name != "Log")
+                {
+                    return false;
+                }
+
+                var args = call.GetArguments();
+                var logLevel = (LogLevel)args[0];
+                var exception = (Exception)args[3];
+
+                return logLevel == LogLevel.Warning && exception.Message.Contains("null");
+            }
+        }
+    }
+}