Organize composer into its own module

packages/app/src/composer/input/state.test.ts

@@ -0,0 +1,93 @@
+import { describe, expect, it } from "vitest";
+import { computeCanStartDictation } from "./state";
+
+const connected = { isConnected: true } as never;
+const disconnected = { isConnected: false } as never;
+
+describe("computeCanStartDictation", () => {
+  it("returns false when socket is disconnected", () => {
+    expect(
+      computeCanStartDictation({
+        client: disconnected,
+        isReadyForDictation: true,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(false);
+  });
+
+  it("returns false when isReadyForDictation is explicitly false", () => {
+    expect(
+      computeCanStartDictation({
+        client: connected,
+        isReadyForDictation: false,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(false);
+  });
+
+  it("returns true when connected and ready", () => {
+    expect(
+      computeCanStartDictation({
+        client: connected,
+        isReadyForDictation: true,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(true);
+  });
+
+  it("falls back to socket connected state when isReadyForDictation is undefined", () => {
+    expect(
+      computeCanStartDictation({
+        client: connected,
+        isReadyForDictation: undefined,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(true);
+
+    expect(
+      computeCanStartDictation({
+        client: disconnected,
+        isReadyForDictation: undefined,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(false);
+  });
+
+  it("returns false when the input is disabled", () => {
+    expect(
+      computeCanStartDictation({
+        client: connected,
+        isReadyForDictation: true,
+        disabled: true,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(false);
+  });
+
+  it("returns false when a dictation unavailable message is present", () => {
+    expect(
+      computeCanStartDictation({
+        client: connected,
+        isReadyForDictation: true,
+        disabled: false,
+        dictationUnavailableMessage: "Microphone unavailable",
+      }),
+    ).toBe(false);
+  });
+
+  it("returns false when client is null", () => {
+    expect(
+      computeCanStartDictation({
+        client: null,
+        isReadyForDictation: true,
+        disabled: false,
+        dictationUnavailableMessage: null,
+      }),
+    ).toBe(false);
+  });
+});