Minor fix

Author: Nirjan Chapagain

src/VirtualClient/VirtualClient.Dependencies/CertificateInstallation.cs

@@ -148,7 +148,7 @@ protected override async Task ExecuteAsync(EventContext telemetryContext, Cancel
                     string certificatePath = this.Combine(this.CertificateDownloadDir, certificateFileName);
 
                     // Delete existing certificate file
-                    if (!this.fileSystem.File.Exists(certificatePath))
+                    if (this.fileSystem.File.Exists(certificatePath))
                     {
                         this.fileSystem.File.Delete(certificatePath);
                     }

src/VirtualClient/VirtualClient.Main/BootstrapCommand.cs

@@ -147,10 +147,14 @@ protected void SetupCertificateInstallation()
                     "The Key Vault URI must be provided (--key-vault) when installing certificates (--cert-name).");
             }
 
+            if (!string.IsNullOrWhiteSpace(this.CertificateDownloadDir))
+            {
+                this.Parameters["CertificateDownloadDir"] = this.CertificateDownloadDir;
+            }
+
             // Set certificate-related parameters
             this.Parameters["KeyVaultUri"] = this.KeyVault;
             this.Parameters["CertificateName"] = this.CertificateName;
-            this.Parameters["CertificateDownloadDir"] = this.CertificateDownloadDir;
         }
 
         protected void SetupPackageInstallation()

src/VirtualClient/VirtualClient.UnitTests/BootstrapCommandTests.cs

@@ -127,6 +127,27 @@ public void SetupCertificateInstallation_SetsUpOnlyExpectedParameters()
             Assert.IsFalse(command.Parameters.ContainsKey("TenantId"));
         }
 
+        [Test]
+        public void SetupCertificateInstallation_AllowsCertificateDownloadDirectory()
+        {
+            var command = new TestBootstrapCommand
+            {
+                Parameters = new Dictionary<string, IConvertible>(StringComparer.OrdinalIgnoreCase),
+                CertificateName = "mycert",
+                KeyVault = "https://myvault.vault.azure.net/",
+                AccessToken = "token123",
+                TenantId = "00000000-0000-0000-0000-000000000001",
+                CertificateDownloadDir = "C:\\certs"
+            };
+
+            command.SetupCertificateInstallationPublic();
+
+            Assert.AreEqual(command.Parameters["KeyVaultUri"], command.KeyVault);
+            Assert.AreEqual(command.Parameters["CertificateName"], command.CertificateName);
+            Assert.AreEqual(command.Parameters["CertificateDownloadDir"], command.CertificateDownloadDir);
+            Assert.AreEqual(command.Parameters.Count, 3);
+        }
+
         [Test]
         [TestCase(null)]
         [TestCase("")]