fix query and add tests

Author: SteveL-MSFT

dsc/src/mcp/list_resources.rs

@@ -43,7 +43,7 @@ impl McpServer {
         let result = task::spawn_blocking(move || {
             let mut dsc = DscManager::new();
             let mut resources = Vec::new();
-            for resource in dsc.list_available(&DiscoveryKind::Resource, "*", "*", ProgressFormat::None) {
+            for resource in dsc.list_available(&DiscoveryKind::Resource, "*", "", ProgressFormat::None) {
                 resources.push(resource);
             }
             ResourceListResult { resources }

dsc/tests/dsc_mcp.tests.ps1

@@ -0,0 +1,100 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+Describe 'Tests for MCP server' {
+    BeforeAll {
+        $processStartInfo = [System.Diagnostics.ProcessStartInfo]::new()
+        $processStartInfo.FileName = "dsc"
+        $processStartInfo.Arguments = "--trace-format plaintext mcp"
+        $processStartInfo.RedirectStandardError = $true
+        $processStartInfo.RedirectStandardOutput = $true
+        $processStartInfo.RedirectStandardInput = $true
+        $mcp = [System.Diagnostics.Process]::Start($processStartInfo)
+
+        function Send-McpRequest($request, [switch]$notify) {
+            $request = $request | ConvertTo-Json -Compress -Depth 10
+            $mcp.StandardInput.WriteLine($request)
+            $mcp.StandardInput.Flush()
+            if (!$notify) {
+                while ($mcp.StandardOutput.Peek() -eq -1) {
+                    Start-Sleep -Milliseconds 100
+                }
+                $stdout = $mcp.StandardOutput.ReadLine()
+                return ($stdout | ConvertFrom-Json -Depth 30)
+            }
+        }
+    }
+
+    AfterAll {
+        $mcp.StandardInput.Close()
+        $mcp.WaitForExit()
+    }
+
+    It 'Initialization works' {
+        $mcpRequest = @{
+            jsonrpc = "2.0"
+            id = 1
+            method = "initialize"
+            params = @{
+                protocolVersion = "2024-11-05"
+                capabilities = @{
+                    tools = @{}
+                }
+                clientInfo = @{
+                    name = "Test Client"
+                    version = "1.0.0"
+                }
+            }
+        }
+
+        $response = Send-McpRequest -request $mcpRequest
+
+        $response.id | Should -Be 1
+        $response.result.capabilities.tools | Should -Not -Be $null
+        $response.result.instructions | Should -Not -BeNullOrEmpty
+
+        $notifyInitialized = @{
+            jsonrpc = "2.0"
+            method = "notifications/initialized"
+        }
+
+        Send-McpRequest -request $notifyInitialized -notify
+    }
+
+    It 'Tools/List works' {
+        $mcpRequest = @{
+            jsonrpc = "2.0"
+            id = 2
+            method = "tools/list"
+            params = @{}
+        }
+
+        $response = Send-McpRequest -request $mcpRequest
+
+        $response.id | Should -Be 2
+        $response.result.tools.Count | Should -Be 1
+        $response.result.tools[0].name | Should -BeExactly 'list_resources'
+    }
+
+    It 'Calling list_resources works' {
+        $mcpRequest = @{
+            jsonrpc = "2.0"
+            id = 3
+            method = "tools/call"
+            params = @{
+                name = "list_resources"
+                arguments = @{}
+            }
+        }
+
+        $response = Send-McpRequest -request $mcpRequest
+        $response.id | Should -Be 3
+        $resources = dsc resource list | ConvertFrom-Json -Depth 20
+        $response.result.structuredContent.resources.Count | Should -Be $resources.Count
+        for ($i = 0; $i -lt $resources.Count; $i++) {
+            $response.result.structuredContent.resources[$i].Resource.type | Should -BeExactly $resources[$i].type
+            $response.result.structuredContent.resources[$i].Resource.version | Should -BeExactly $resources[$i].version
+            $response.result.structuredContent.resources[$i].Resource.path | Should -BeExactly $resources[$i].path
+        }
+    }
+}