test(source/cloud-sql-mysql): create MCP integration tests

Author: dishaprakash

tests/cloudsqlmysql/cloud_sql_mysql_create_instance_mcp_integration_test.go

@@ -0,0 +1,261 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cloudsqlmysql_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"regexp"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/genai-toolbox/internal/testutils"
+	"github.com/googleapis/genai-toolbox/tests"
+	"google.golang.org/api/sqladmin/v1"
+)
+
+const createInstanceToolTypeMCP = "cloud-sql-mysql-create-instance"
+
+type createInstanceTransportMCP struct {
+	transport http.RoundTripper
+	url       *url.URL
+}
+
+func (t *createInstanceTransportMCP) RoundTrip(req *http.Request) (*http.Response, error) {
+	if strings.HasPrefix(req.URL.String(), "https://sqladmin.googleapis.com") {
+		req.URL.Scheme = t.url.Scheme
+		req.URL.Host = t.url.Host
+	}
+	return t.transport.RoundTrip(req)
+}
+
+type masterHandlerMCP struct {
+	t *testing.T
+}
+
+func (h *masterHandlerMCP) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if !strings.Contains(r.UserAgent(), "genai-toolbox/") {
+		h.t.Errorf("User-Agent header not found")
+	}
+
+	var body sqladmin.DatabaseInstance
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		h.t.Fatalf("failed to decode request body: %v", err)
+	}
+
+	instanceName := body.Name
+	if instanceName == "" {
+		http.Error(w, "missing instance name", http.StatusBadRequest)
+		return
+	}
+
+	var expectedBody sqladmin.DatabaseInstance
+	var response any
+	var statusCode int
+
+	switch instanceName {
+	case "instance1":
+		expectedBody = sqladmin.DatabaseInstance{
+			Project:         "p1",
+			Name:            "instance1",
+			DatabaseVersion: "MYSQL_8_0",
+			RootPassword:    "password123",
+			Settings: &sqladmin.Settings{
+				AvailabilityType: "REGIONAL",
+				Edition:          "ENTERPRISE_PLUS",
+				Tier:             "db-perf-optimized-N-8",
+				DataDiskSizeGb:   250,
+				DataDiskType:     "PD_SSD",
+			},
+		}
+		response = map[string]any{"name": "op1", "status": "PENDING"}
+		statusCode = http.StatusOK
+	case "instance2":
+		expectedBody = sqladmin.DatabaseInstance{
+			Project:         "p2",
+			Name:            "instance2",
+			DatabaseVersion: "MYSQL_8_4",
+			RootPassword:    "password456",
+			Settings: &sqladmin.Settings{
+				AvailabilityType: "ZONAL",
+				Edition:          "ENTERPRISE_PLUS",
+				Tier:             "db-perf-optimized-N-2",
+				DataDiskSizeGb:   100,
+				DataDiskType:     "PD_SSD",
+			},
+		}
+		response = map[string]any{"name": "op2", "status": "RUNNING"}
+		statusCode = http.StatusOK
+	default:
+		http.Error(w, fmt.Sprintf("unhandled instance name: %s", instanceName), http.StatusInternalServerError)
+		return
+	}
+
+	if expectedBody.Project != body.Project {
+		h.t.Errorf("unexpected project: got %q, want %q", body.Project, expectedBody.Project)
+	}
+	if expectedBody.Name != body.Name {
+		h.t.Errorf("unexpected name: got %q, want %q", body.Name, expectedBody.Name)
+	}
+	if expectedBody.DatabaseVersion != body.DatabaseVersion {
+		h.t.Errorf("unexpected databaseVersion: got %q, want %q", body.DatabaseVersion, expectedBody.DatabaseVersion)
+	}
+	if expectedBody.RootPassword != body.RootPassword {
+		h.t.Errorf("unexpected rootPassword: got %q, want %q", body.RootPassword, expectedBody.RootPassword)
+	}
+	if diff := cmp.Diff(expectedBody.Settings, body.Settings); diff != "" {
+		h.t.Errorf("unexpected request body settings (-want +got):\n%s", diff)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func TestCreateInstanceToolEndpointsMCP(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	handler := &masterHandlerMCP{t: t}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	serverURL, err := url.Parse(server.URL)
+	if err != nil {
+		t.Fatalf("failed to parse server URL: %v", err)
+	}
+
+	originalTransport := http.DefaultClient.Transport
+	if originalTransport == nil {
+		originalTransport = http.DefaultTransport
+	}
+	http.DefaultClient.Transport = &createInstanceTransportMCP{
+		transport: originalTransport,
+		url:       serverURL,
+	}
+	t.Cleanup(func() {
+		http.DefaultClient.Transport = originalTransport
+	})
+
+	toolsFile := getCreateInstanceToolsConfigMCP()
+	cmd, cleanup, err := tests.StartCmd(ctx, toolsFile)
+	if err != nil {
+		t.Fatalf("command initialization returned an error: %v", err)
+	}
+	defer cleanup()
+
+	waitCtx, cancelWait := context.WithTimeout(ctx, 10*time.Second)
+	defer cancelWait()
+	out, err := testutils.WaitForString(waitCtx, regexp.MustCompile(`Server ready to serve`), cmd.Out)
+	if err != nil {
+		t.Logf("toolbox command logs: \n%s", out)
+		t.Fatalf("toolbox didn't start successfully: %v", err)
+	}
+
+	tcs := []struct {
+		name        string
+		toolName    string
+		body        string
+		want        string
+		expectError bool
+	}{
+		{
+			name:        "verify successful instance creation with production preset",
+			toolName:    "create-instance-prod",
+			body:        `{"project": "p1", "name": "instance1", "databaseVersion": "MYSQL_8_0", "rootPassword": "password123", "editionPreset": "Production"}`,
+			want:        `{"name":"op1","status":"PENDING"}`,
+			expectError: false,
+		},
+		{
+			name:        "verify successful instance creation with development preset",
+			toolName:    "create-instance-dev",
+			body:        `{"project": "p2", "name": "instance2", "rootPassword": "password456", "editionPreset": "Development"}`,
+			want:        `{"name":"op2","status":"RUNNING"}`,
+			expectError: false,
+		},
+		{
+			name:        "verify missing required parameter returns schema error",
+			toolName:    "create-instance-prod",
+			body:        `{"name": "instance1"}`,
+			want:        `parameter "project" is required`,
+			expectError: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		t.Run(tc.name, func(t *testing.T) {
+			var args map[string]any
+			if err := json.Unmarshal([]byte(tc.body), &args); err != nil {
+				t.Fatalf("failed to unmarshal body: %v", err)
+			}
+
+			statusCode, mcpResp, err := tests.InvokeMCPTool(t, tc.toolName, args, nil)
+			if err != nil {
+				t.Fatalf("native error executing %s: %v", tc.toolName, err)
+			}
+
+			if statusCode != http.StatusOK {
+				t.Fatalf("expected status 200, got %d", statusCode)
+			}
+
+			if tc.expectError {
+				tests.AssertMCPError(t, mcpResp, tc.want)
+			} else {
+				if mcpResp.Result.IsError {
+					t.Fatalf("expected success, got error result: %v", mcpResp.Result)
+				}
+				gotStr := mcpResp.Result.Content[0].Text
+				var got, want map[string]any
+				if err := json.Unmarshal([]byte(gotStr), &got); err != nil {
+					t.Fatalf("failed to unmarshal result: %v", err)
+				}
+				if err := json.Unmarshal([]byte(tc.want), &want); err != nil {
+					t.Fatalf("failed to unmarshal want: %v", err)
+				}
+				if diff := cmp.Diff(want, got); diff != "" {
+					t.Errorf("unexpected result (-want +got):\n%s", diff)
+				}
+			}
+		})
+	}
+}
+
+func getCreateInstanceToolsConfigMCP() map[string]any {
+	return map[string]any{
+		"sources": map[string]any{
+			"my-cloud-sql-source": map[string]any{
+				"type": "cloud-sql-admin",
+			},
+		},
+		"tools": map[string]any{
+			"create-instance-prod": map[string]any{
+				"type":   createInstanceToolTypeMCP,
+				"source": "my-cloud-sql-source",
+			},
+			"create-instance-dev": map[string]any{
+				"type":   createInstanceToolTypeMCP,
+				"source": "my-cloud-sql-source",
+			},
+		},
+	}
+}