public override IEnumerator GetEnumerator()

in AwsEncryptionSDK/runtimes/net/TestVectorsNative/TestVectors/TestVectors.cs [75:124]
41 lines of code
10 McCabe index (conditional complexity)

        public override IEnumerator<object[]> GetEnumerator()
        {
            long count = 0;
            foreach(var vectorEntry in VectorMap) {

                if (!TargetVector(vectorEntry))
                {
                    continue;
                }

                DecryptVector vector = vectorEntry.Value;
                byte[] plaintext = null;
                if (vector.Result is {Output: not null})
                {
                    if (vector.Result.Output.Plaintext != null)
                    {
                        string plaintextPath = Utils.ManifestUriToPath(vector.Result.Output.Plaintext, VectorRoot);
                        if (!File.Exists(plaintextPath))
                        {
                            throw new ArgumentException($"Could not find plaintext file at path: {plaintextPath}");
                        }

                        plaintext = File.ReadAllBytes(plaintextPath);
                    }
                }

                string errorMessage = null;
                if (vector.Result != null && vector.Result.Error != null)
                {
                    errorMessage = vector.Result.Error.ErrorMessage;
                }

                string ciphertextPath = Utils.ManifestUriToPath(vector.Ciphertext, VectorRoot);
                if (!File.Exists(ciphertextPath)) {
                    throw new ArgumentException($"Could not find ciphertext file at path: {ciphertextPath}");
                }
                byte[] ciphertext = File.ReadAllBytes(Utils.ManifestUriToPath(vector.Ciphertext, VectorRoot));

                MemoryStream ciphertextStream = new MemoryStream(ciphertext);

                yield return new object[] { vectorEntry.Key, vector, KeyMap, plaintext, errorMessage, ciphertextStream, _netV400RetryPolicy };
                count++;
            }

            // If nothing gets `yield return`-ed, xUnit gives an unclear error message. This error is better.
            if (count == 0)
            {
                throw new Exception("No targeted vectors found");
            }
        }