Initial Commit

packages/media/audio/audio-controllers/tests/fake-midi.ts

@@ -0,0 +1,132 @@
+/**
+ * Fake MIDI fixture — supplies the package's spec-mandated injectable seam.
+ * Lives outside `src/` so it does not appear in coverage reports yet remains
+ * shared between the unit, integration, and e2e suites.
+ */
+
+import type {
+    MidiAccessAdapter,
+    MidiAccessLike,
+    MidiInputLike,
+    MidiOutputLike,
+} from "../src/base/midi-controller-plugin.types.js";
+
+export interface FakeMidiInput extends MidiInputLike {
+    emit(data: ReadonlyArray<number>, timeStamp?: number): void;
+}
+
+export interface FakeMidiOutput extends MidiOutputLike {
+    readonly sent: number[][];
+    disconnect(): void;
+}
+
+export interface FakeMidiAccess extends MidiAccessLike {
+    readonly mutableInputs: Map<string, FakeMidiInput>;
+    readonly mutableOutputs: Map<string, FakeMidiOutput>;
+    disconnectPort(port: FakeMidiInput | FakeMidiOutput): void;
+    reconnectPort(port: FakeMidiInput | FakeMidiOutput): void;
+}
+
+function createInput(id: string, name: string): FakeMidiInput {
+    const port: FakeMidiInput = {
+        id,
+        name,
+        state: "connected",
+        type: "input",
+        onmidimessage: null,
+        emit(data: ReadonlyArray<number>, timeStamp = 0) {
+            port.onmidimessage?.({
+                data: new Uint8Array(data),
+                timeStamp,
+            });
+        },
+    } as FakeMidiInput;
+    return port;
+}
+
+function createOutput(id: string, name: string): FakeMidiOutput {
+    const sent: number[][] = [];
+    let connectedState: "connected" | "disconnected" = "connected";
+    const port = {
+        id,
+        name,
+        get state(): "connected" | "disconnected" {
+            return connectedState;
+        },
+        type: "output" as const,
+        sent,
+        send(data: ReadonlyArray<number> | Uint8Array) {
+            sent.push(Array.isArray(data) ? data.slice() : Array.from(data));
+        },
+        disconnect() {
+            connectedState = "disconnected";
+        },
+    } satisfies FakeMidiOutput;
+    return port;
+}
+
+export function createFakeAccess(
+    options: { readonly inputName?: string; readonly outputName?: string } = {}
+): FakeMidiAccess {
+    const inputName = options.inputName ?? "Demo Input";
+    const outputName = options.outputName ?? "Demo Output";
+    const input = createInput("in-1", inputName);
+    const output = createOutput("out-1", outputName);
+    const mutableInputs = new Map<string, FakeMidiInput>([[input.id, input]]);
+    const mutableOutputs = new Map<string, FakeMidiOutput>([
+        [output.id, output],
+    ]);
+    const access: FakeMidiAccess = {
+        get inputs(): ReadonlyMap<string, MidiInputLike> {
+            return mutableInputs;
+        },
+        get outputs(): ReadonlyMap<string, MidiOutputLike> {
+            return mutableOutputs;
+        },
+        mutableInputs,
+        mutableOutputs,
+        onstatechange: null,
+        disconnectPort(port) {
+            if (port.type === "input") mutableInputs.delete(port.id);
+            else {
+                port.disconnect();
+                mutableOutputs.delete(port.id);
+            }
+            access.onstatechange?.({
+                port: { ...port, state: "disconnected" },
+            });
+        },
+        reconnectPort(port) {
+            if (port.type === "input") mutableInputs.set(port.id, port);
+            else mutableOutputs.set(port.id, port);
+            access.onstatechange?.({
+                port: { ...port, state: "connected" },
+            });
+        },
+    };
+    return access;
+}
+
+export function createFakeAdapter(
+    access: FakeMidiAccess,
+    options: { readonly reject?: Error } = {}
+): MidiAccessAdapter {
+    return {
+        async requestAccess() {
+            if (options.reject) throw options.reject;
+            return access;
+        },
+    };
+}
+
+export function getFirstInput(access: FakeMidiAccess): FakeMidiInput {
+    const first = access.mutableInputs.values().next().value;
+    if (!first) throw new Error("no input");
+    return first;
+}
+
+export function getFirstOutput(access: FakeMidiAccess): FakeMidiOutput {
+    const first = access.mutableOutputs.values().next().value;
+    if (!first) throw new Error("no output");
+    return first;
+}