feat(migration): Convert Get-DbaComputerCertificate to C# binary cmdlet

- All parameters preserved (ComputerName, Credential, Store, Folder, Path, Type, Thumbprint)
- All code paths implemented including Store/Folder "All" expansion
- Fixed $Type not being passed to remote scriptblock (PS1 bug)
- Build passes on both net472 and net8.0
- C# unit tests written and passing (12 tests)
- Pester integration tests pass (1/1, 3 skipped on pwsh 7+)
- Feature parity verified at 100%
- PS1 retired, cmdlet exported from dbatools.library

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: potatoqualitee

dbatools.library.psd1

@@ -79,6 +79,7 @@
         'Get-DbaClientProtocol',
         'Get-DbaCmConnection',
         'Get-DbaCmObject',
+        'Get-DbaComputerCertificate',
         'Get-DbaCpuRingBuffer',
         'Get-DbaCpuUsage',
         'Get-DbaDeprecatedFeature',

docs/plan/TRACKER-MIGRATE-COMPUTER.md

@@ -11,7 +11,7 @@
 | 2 | Get-DbaClientProtocol | DONE | GetDbaClientProtocolCommand.cs | OK | 100% | 1/1 (1 skipped) | Read-only, no deps |
 | 3 | Get-DbaCmConnection | DONE | GetDbaCmConnectionCommand.cs | OK | 100% | 3/3 | Read-only, no deps |
 | 4 | Get-DbaCmObject | DONE | GetDbaCmObjectCommand.cs | OK | 100% | 2/2 (2 test-adapt) | Read-only, no deps |
-| 5 | Get-DbaComputerCertificate | PENDING | | | | | Read-only, no deps |
+| 5 | Get-DbaComputerCertificate | DONE | GetDbaComputerCertificateCommand.cs | OK | 100% | 1/1 (3 skipped) | Read-only, no deps |
 | 6 | Get-DbaComputerSystem | PENDING | | | | | Read-only, no deps |
 | 7 | Get-DbaDiskSpace | PENDING | | | | | Read-only, no deps |
 | 8 | Get-DbaLocaleSetting | PENDING | | | | | Read-only, no deps |

project/dbatools.Tests/Commands/GetDbaComputerCertificateCommandTests.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Management.Automation;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Dataplat.Dbatools.Commands;
+
+namespace Dataplat.Dbatools.Tests.Commands
+{
+    [TestClass]
+    public class GetDbaComputerCertificateCommandTests
+    {
+        #region ConvertPSObjectsToStringArray
+        [TestMethod]
+        public void ConvertPSObjectsToStringArray_NullInput_ReturnsNull()
+        {
+            var result = GetDbaComputerCertificateCommand.ConvertPSObjectsToStringArray(null);
+            Assert.IsNull(result);
+        }
+
+        [TestMethod]
+        public void ConvertPSObjectsToStringArray_EmptyCollection_ReturnsNull()
+        {
+            var collection = new Collection<PSObject>();
+            var result = GetDbaComputerCertificateCommand.ConvertPSObjectsToStringArray(collection);
+            Assert.IsNull(result);
+        }
+
+        [TestMethod]
+        public void ConvertPSObjectsToStringArray_SingleItem_ReturnsSingleElementArray()
+        {
+            var collection = new Collection<PSObject>();
+            collection.Add(new PSObject("LocalMachine"));
+            var result = GetDbaComputerCertificateCommand.ConvertPSObjectsToStringArray(collection);
+            Assert.IsNotNull(result);
+            Assert.AreEqual(1, result.Length);
+            Assert.AreEqual("LocalMachine", result[0]);
+        }
+
+        [TestMethod]
+        public void ConvertPSObjectsToStringArray_MultipleItems_ReturnsAllElements()
+        {
+            var collection = new Collection<PSObject>();
+            collection.Add(new PSObject("LocalMachine"));
+            collection.Add(new PSObject("CurrentUser"));
+            var result = GetDbaComputerCertificateCommand.ConvertPSObjectsToStringArray(collection);
+            Assert.IsNotNull(result);
+            Assert.AreEqual(2, result.Length);
+            Assert.AreEqual("LocalMachine", result[0]);
+            Assert.AreEqual("CurrentUser", result[1]);
+        }
+
+        [TestMethod]
+        public void ConvertPSObjectsToStringArray_NullElement_ReturnsNullInArray()
+        {
+            var collection = new Collection<PSObject>();
+            collection.Add(new PSObject("My"));
+            collection.Add(null);
+            collection.Add(new PSObject("Root"));
+            var result = GetDbaComputerCertificateCommand.ConvertPSObjectsToStringArray(collection);
+            Assert.IsNotNull(result);
+            Assert.AreEqual(3, result.Length);
+            Assert.AreEqual("My", result[0]);
+            Assert.IsNull(result[1]);
+            Assert.AreEqual("Root", result[2]);
+        }
+        #endregion
+
+        #region GetCertRetrievalScript
+        [TestMethod]
+        public void GetCertRetrievalScript_ReturnsNonEmptyScript()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            Assert.IsFalse(String.IsNullOrWhiteSpace(script));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_ContainsPathHandling()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            Assert.IsTrue(script.Contains("if ($Path)"));
+            Assert.IsTrue(script.Contains("ReadAllBytes"));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_ContainsThumbprintFiltering()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            Assert.IsTrue(script.Contains("if ($Thumbprint)"));
+            Assert.IsTrue(script.Contains("Where-Object Thumbprint -in $Thumbprint"));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_ContainsServiceTypeFiltering()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            // Server Authentication OID (escaped regex pattern in the script)
+            Assert.IsTrue(script.Contains(@"1\.3\.6\.1\.5\.5\.7\.3\.1"));
+            Assert.IsTrue(script.Contains("$Type -eq 'Service'"));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_ContainsNotePropertyAdditions()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            Assert.IsTrue(script.Contains("NotePropertyName Algorithm"));
+            Assert.IsTrue(script.Contains("NotePropertyName ComputerName"));
+            Assert.IsTrue(script.Contains("NotePropertyName Name"));
+            Assert.IsTrue(script.Contains("NotePropertyName Store"));
+            Assert.IsTrue(script.Contains("NotePropertyName Folder"));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_ContainsCoreCertificateFunctions()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            Assert.IsTrue(script.Contains("function Get-CoreCertStore"));
+            Assert.IsTrue(script.Contains("function Get-CoreCertificate"));
+        }
+
+        [TestMethod]
+        public void GetCertRetrievalScript_IsParsableAsScriptBlock()
+        {
+            var script = GetDbaComputerCertificateCommand.GetCertRetrievalScript();
+            // This will throw if the script is not valid PowerShell
+            var sb = ScriptBlock.Create(script);
+            Assert.IsNotNull(sb);
+        }
+        #endregion
+    }
+}