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| 1 | +import { describe, it, expect, mock } from "bun:test"; |
| 2 | +import { |
| 3 | + registerAppTool, |
| 4 | + registerAppResource, |
| 5 | + RESOURCE_URI_META_KEY, |
| 6 | + RESOURCE_MIME_TYPE, |
| 7 | +} from "./index"; |
| 8 | +import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; |
| 9 | + |
| 10 | +describe("registerAppTool", () => { |
| 11 | + it("should pass through config to server.registerTool", () => { |
| 12 | + let capturedName: string | undefined; |
| 13 | + let capturedConfig: Record<string, unknown> | undefined; |
| 14 | + let capturedHandler: unknown; |
| 15 | + |
| 16 | + const mockServer = { |
| 17 | + registerTool: mock( |
| 18 | + (name: string, config: Record<string, unknown>, handler: unknown) => { |
| 19 | + capturedName = name; |
| 20 | + capturedConfig = config; |
| 21 | + capturedHandler = handler; |
| 22 | + }, |
| 23 | + ), |
| 24 | + registerResource: mock(() => {}), |
| 25 | + }; |
| 26 | + |
| 27 | + const handler = async () => ({ |
| 28 | + content: [{ type: "text" as const, text: "ok" }], |
| 29 | + }); |
| 30 | + |
| 31 | + registerAppTool( |
| 32 | + mockServer as unknown as Pick<McpServer, "registerTool">, |
| 33 | + "my-tool", |
| 34 | + { |
| 35 | + title: "My Tool", |
| 36 | + description: "A test tool", |
| 37 | + _meta: { |
| 38 | + [RESOURCE_URI_META_KEY]: "ui://test/widget.html", |
| 39 | + }, |
| 40 | + }, |
| 41 | + handler, |
| 42 | + ); |
| 43 | + |
| 44 | + expect(mockServer.registerTool).toHaveBeenCalledTimes(1); |
| 45 | + expect(capturedName).toBe("my-tool"); |
| 46 | + expect(capturedConfig?.title).toBe("My Tool"); |
| 47 | + expect(capturedConfig?.description).toBe("A test tool"); |
| 48 | + expect( |
| 49 | + (capturedConfig?._meta as Record<string, unknown>)?.[ |
| 50 | + RESOURCE_URI_META_KEY |
| 51 | + ], |
| 52 | + ).toBe("ui://test/widget.html"); |
| 53 | + expect(capturedHandler).toBe(handler); |
| 54 | + }); |
| 55 | +}); |
| 56 | + |
| 57 | +describe("registerAppResource", () => { |
| 58 | + it("should register a resource with default MIME type", () => { |
| 59 | + let capturedName: string | undefined; |
| 60 | + let capturedUri: string | undefined; |
| 61 | + let capturedConfig: Record<string, unknown> | undefined; |
| 62 | + |
| 63 | + const mockServer = { |
| 64 | + registerTool: mock(() => {}), |
| 65 | + registerResource: mock( |
| 66 | + (name: string, uri: string, config: Record<string, unknown>) => { |
| 67 | + capturedName = name; |
| 68 | + capturedUri = uri; |
| 69 | + capturedConfig = config; |
| 70 | + }, |
| 71 | + ), |
| 72 | + }; |
| 73 | + |
| 74 | + const callback = async () => ({ |
| 75 | + contents: [ |
| 76 | + { |
| 77 | + uri: "ui://test/widget.html", |
| 78 | + mimeType: RESOURCE_MIME_TYPE, |
| 79 | + text: "<html/>", |
| 80 | + }, |
| 81 | + ], |
| 82 | + }); |
| 83 | + |
| 84 | + registerAppResource( |
| 85 | + mockServer as unknown as Pick<McpServer, "registerResource">, |
| 86 | + "My Resource", |
| 87 | + "ui://test/widget.html", |
| 88 | + { |
| 89 | + description: "A test resource", |
| 90 | + _meta: { ui: {} }, |
| 91 | + }, |
| 92 | + callback, |
| 93 | + ); |
| 94 | + |
| 95 | + expect(mockServer.registerResource).toHaveBeenCalledTimes(1); |
| 96 | + expect(capturedName).toBe("My Resource"); |
| 97 | + expect(capturedUri).toBe("ui://test/widget.html"); |
| 98 | + expect(capturedConfig?.mimeType).toBe(RESOURCE_MIME_TYPE); |
| 99 | + expect(capturedConfig?.description).toBe("A test resource"); |
| 100 | + }); |
| 101 | + |
| 102 | + it("should allow custom MIME type to override default", () => { |
| 103 | + let capturedConfig: Record<string, unknown> | undefined; |
| 104 | + |
| 105 | + const mockServer = { |
| 106 | + registerTool: mock(() => {}), |
| 107 | + registerResource: mock( |
| 108 | + (_name: string, _uri: string, config: Record<string, unknown>) => { |
| 109 | + capturedConfig = config; |
| 110 | + }, |
| 111 | + ), |
| 112 | + }; |
| 113 | + |
| 114 | + registerAppResource( |
| 115 | + mockServer as unknown as Pick<McpServer, "registerResource">, |
| 116 | + "My Resource", |
| 117 | + "ui://test/widget.html", |
| 118 | + { |
| 119 | + mimeType: "text/html", |
| 120 | + _meta: { ui: {} }, |
| 121 | + }, |
| 122 | + async () => ({ |
| 123 | + contents: [ |
| 124 | + { |
| 125 | + uri: "ui://test/widget.html", |
| 126 | + mimeType: "text/html", |
| 127 | + text: "<html/>", |
| 128 | + }, |
| 129 | + ], |
| 130 | + }), |
| 131 | + ); |
| 132 | + |
| 133 | + // Custom mimeType should override the default |
| 134 | + expect(capturedConfig?.mimeType).toBe("text/html"); |
| 135 | + }); |
| 136 | + |
| 137 | + it("should call the callback when handler is invoked", async () => { |
| 138 | + let capturedHandler: (() => Promise<unknown>) | undefined; |
| 139 | + |
| 140 | + const mockServer = { |
| 141 | + registerTool: mock(() => {}), |
| 142 | + registerResource: mock( |
| 143 | + ( |
| 144 | + _name: string, |
| 145 | + _uri: string, |
| 146 | + _config: unknown, |
| 147 | + handler: () => Promise<unknown>, |
| 148 | + ) => { |
| 149 | + capturedHandler = handler; |
| 150 | + }, |
| 151 | + ), |
| 152 | + }; |
| 153 | + |
| 154 | + const expectedResult = { |
| 155 | + contents: [ |
| 156 | + { |
| 157 | + uri: "ui://test/widget.html", |
| 158 | + mimeType: RESOURCE_MIME_TYPE, |
| 159 | + text: "<html>content</html>", |
| 160 | + }, |
| 161 | + ], |
| 162 | + }; |
| 163 | + const callback = mock(async () => expectedResult); |
| 164 | + |
| 165 | + registerAppResource( |
| 166 | + mockServer as unknown as Pick<McpServer, "registerResource">, |
| 167 | + "My Resource", |
| 168 | + "ui://test/widget.html", |
| 169 | + { _meta: { ui: {} } }, |
| 170 | + callback, |
| 171 | + ); |
| 172 | + |
| 173 | + expect(capturedHandler).toBeDefined(); |
| 174 | + const result = await capturedHandler!(); |
| 175 | + |
| 176 | + expect(callback).toHaveBeenCalledTimes(1); |
| 177 | + expect(result).toEqual(expectedResult); |
| 178 | + }); |
| 179 | +}); |
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