test: add unit tests for pure helpers in app/utils

test/utils.test.ts

@@ -0,0 +1,141 @@
+import {
+  trimTopic,
+  semverCompare,
+  getMessageTextContent,
+  getMessageTextContentWithoutThinking,
+  getMessageImages,
+  isDalle3,
+  getModelSizes,
+  supportsCustomSize,
+} from "../app/utils";
+import { RequestMessage } from "../app/client/api";
+
+describe("trimTopic", () => {
+  test("removes wrapping quotes and asterisks", () => {
+    expect(trimTopic('"Hello"')).toBe("Hello");
+    expect(trimTopic("“Hello”")).toBe("Hello");
+    expect(trimTopic("*Hello*")).toBe("Hello");
+    expect(trimTopic('"*Title*"')).toBe("Title");
+  });
+
+  test("removes trailing punctuation (CJK and ASCII)", () => {
+    expect(trimTopic("你好。")).toBe("你好");
+    expect(trimTopic("Are you sure?")).toBe("Are you sure");
+    expect(trimTopic("Hello, world.")).toBe("Hello, world");
+  });
+
+  test("keeps inner punctuation and returns empty string untouched", () => {
+    expect(trimTopic("a, b, c")).toBe("a, b, c");
+    expect(trimTopic("")).toBe("");
+  });
+});
+
+describe("semverCompare", () => {
+  test("returns 0 for equal versions", () => {
+    expect(semverCompare("1.0.0", "1.0.0")).toBe(0);
+  });
+
+  test("compares numerically, not lexicographically", () => {
+    expect(semverCompare("1.10.0", "1.2.0")).toBeGreaterThan(0);
+    expect(semverCompare("1.2.0", "1.10.0")).toBeLessThan(0);
+  });
+
+  test("treats a prerelease as lower than its release", () => {
+    expect(semverCompare("1.0.0", "1.0.0-beta")).toBe(1);
+    expect(semverCompare("1.0.0-beta", "1.0.0")).toBe(-1);
+  });
+});
+
+describe("getMessageTextContent", () => {
+  test("returns plain string content as-is", () => {
+    const msg: RequestMessage = { role: "user", content: "hello" };
+    expect(getMessageTextContent(msg)).toBe("hello");
+  });
+
+  test("returns the first text part of multimodal content", () => {
+    const msg: RequestMessage = {
+      role: "user",
+      content: [
+        { type: "image_url", image_url: { url: "http://img" } },
+        { type: "text", text: "a caption" },
+      ],
+    };
+    expect(getMessageTextContent(msg)).toBe("a caption");
+  });
+
+  test("returns empty string when there is no text part", () => {
+    const msg: RequestMessage = {
+      role: "user",
+      content: [{ type: "image_url", image_url: { url: "http://img" } }],
+    };
+    expect(getMessageTextContent(msg)).toBe("");
+  });
+});
+
+describe("getMessageTextContentWithoutThinking", () => {
+  test("drops thinking lines that start with '> '", () => {
+    const msg: RequestMessage = {
+      role: "assistant",
+      content: "> reasoning step\nfinal answer",
+    };
+    expect(getMessageTextContentWithoutThinking(msg)).toBe("final answer");
+  });
+
+  test("drops blank lines and trims the result", () => {
+    const msg: RequestMessage = {
+      role: "assistant",
+      content: "\n> thinking\n\nline one\nline two\n",
+    };
+    expect(getMessageTextContentWithoutThinking(msg)).toBe(
+      "line one\nline two",
+    );
+  });
+});
+
+describe("getMessageImages", () => {
+  test("returns an empty array for string content", () => {
+    const msg: RequestMessage = { role: "user", content: "no images here" };
+    expect(getMessageImages(msg)).toEqual([]);
+  });
+
+  test("collects all image urls from multimodal content", () => {
+    const msg: RequestMessage = {
+      role: "user",
+      content: [
+        { type: "image_url", image_url: { url: "http://a" } },
+        { type: "text", text: "between" },
+        { type: "image_url", image_url: { url: "http://b" } },
+      ],
+    };
+    expect(getMessageImages(msg)).toEqual(["http://a", "http://b"]);
+  });
+});
+
+describe("isDalle3", () => {
+  test("matches only the exact dall-e-3 model id", () => {
+    expect(isDalle3("dall-e-3")).toBe(true);
+    expect(isDalle3("dall-e-2")).toBe(false);
+    expect(isDalle3("gpt-4")).toBe(false);
+  });
+});
+
+describe("getModelSizes / supportsCustomSize", () => {
+  test("returns dall-e-3 sizes", () => {
+    expect(getModelSizes("dall-e-3")).toEqual([
+      "1024x1024",
+      "1792x1024",
+      "1024x1792",
+    ]);
+    expect(supportsCustomSize("dall-e-3")).toBe(true);
+  });
+
+  test("returns cogview sizes (case-insensitive match)", () => {
+    expect(getModelSizes("CogView-3")).toContain("768x1344");
+    expect(supportsCustomSize("cogview-3")).toBe(true);
+  });
+
+  test("returns no sizes for models without custom sizing", () => {
+    expect(getModelSizes("gpt-4")).toEqual([]);
+    expect(supportsCustomSize("gpt-4")).toBe(false);
+  });
+});