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* Tests for replaceImageParts helper function.
*/
import test from "node:test";
import assert from "node:assert/strict";
import { replaceImageParts } from "@/lib/guardrails/visionBridgeHelpers";
test("replaceImageParts replaces single image with description", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "user",
content: [
{ type: "text", text: "What is in this image?" },
{ type: "image_url", image_url: { url: "https://example.com/image.png" } },
],
},
],
};
const descriptions = ["[Image 1]: A beautiful sunset"];
const result = replaceImageParts(body, descriptions);
// Should have original text preserved
const content = result.messages[0].content as Array<{ type: string; text?: string }>;
assert.strictEqual(content[0].type, "text");
assert.strictEqual(content[0].text, "What is in this image?");
// Should have description instead of image
assert.strictEqual(content[1].type, "text");
assert.strictEqual(content[1].text, "[Image 1]: A beautiful sunset");
});
test("replaceImageParts replaces multiple images with descriptions", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "user",
content: [
{ type: "text", text: "Compare these images" },
{ type: "image_url", image_url: { url: "https://example.com/A.png" } },
{ type: "image_url", image_url: { url: "https://example.com/B.png" } },
{ type: "image_url", image_url: { url: "https://example.com/C.png" } },
],
},
],
};
const descriptions = ["[Image 1]: A cat", "[Image 2]: A dog", "[Image 3]: A bird"];
const result = replaceImageParts(body, descriptions);
const content = result.messages[0].content as Array<{ type: string; text?: string }>;
assert.strictEqual(content[0].type, "text");
assert.strictEqual(content[0].text, "Compare these images");
assert.strictEqual(content[1].type, "text");
assert.strictEqual(content[1].text, "[Image 1]: A cat");
assert.strictEqual(content[2].type, "text");
assert.strictEqual(content[2].text, "[Image 2]: A dog");
assert.strictEqual(content[3].type, "text");
assert.strictEqual(content[3].text, "[Image 3]: A bird");
});
test("replaceImageParts handles empty descriptions array", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "user",
content: [
{ type: "text", text: "Hello" },
{ type: "image_url", image_url: { url: "https://example.com/image.png" } },
],
},
],
};
const result = replaceImageParts(body, []);
// Original should be unchanged
const content = result.messages[0].content as Array<{ type: string }>;
assert.strictEqual(content[1].type, "image_url");
});
test("replaceImageParts preserves non-image content", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "system",
content: "You are a helpful assistant.",
},
{
role: "user",
content: [
{ type: "text", text: "Analyze this" },
{ type: "image_url", image_url: { url: "https://example.com/image.png" } },
],
},
{
role: "assistant",
content: "I can see the image shows a sunset.",
},
],
};
const result = replaceImageParts(body, ["[Image 1]: A sunset over the ocean"]);
// System message should be unchanged
assert.strictEqual(result.messages[0].content, "You are a helpful assistant.");
// Assistant message should be unchanged
assert.strictEqual(result.messages[2].content, "I can see the image shows a sunset.");
});
test("replaceImageParts handles base64 images", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "user",
content: [
{
type: "image",
source: {
type: "base64",
media_type: "image/png",
data: "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==",
},
},
],
},
],
};
const descriptions = ["[Image 1]: A red circle"];
const result = replaceImageParts(body, descriptions);
const content = result.messages[0].content as Array<{ type: string; text?: string }>;
assert.strictEqual(content[0].type, "text");
assert.strictEqual(content[0].text, "[Image 1]: A red circle");
});
test("replaceImageParts handles undefined descriptions", () => {
const body = {
model: "test",
messages: [
{
role: "user",
content: [
{ type: "text", text: "Hello" },
{ type: "image_url", image_url: { url: "https://example.com/image.png" } },
],
},
],
};
const result = replaceImageParts(body, undefined as unknown as string[]);
// Should return original body when descriptions is undefined
const content = result.messages[0].content as Array<{ type: string }>;
assert.strictEqual(content[1].type, "image_url");
});
test("replaceImageParts handles empty messages array", () => {
const body = {
model: "test",
messages: [],
};
const descriptions = ["[Image 1]: Description"];
const result = replaceImageParts(body, descriptions);
assert.deepStrictEqual(result.messages, []);
});
test("replaceImageParts handles messages without content array", () => {
const body = {
model: "test",
messages: [
{ role: "user", content: "Just a text message" },
{
role: "user",
content: [{ type: "image_url", image_url: { url: "https://example.com/image.png" } }],
},
],
};
const descriptions = ["[Image 1]: Description"];
const result = replaceImageParts(body, descriptions);
// First message (string content) should be unchanged
assert.strictEqual(result.messages[0].content, "Just a text message");
// Second message should have image replaced
const content = result.messages[1].content as Array<{ type: string; text?: string }>;
assert.strictEqual(content[0].type, "text");
assert.strictEqual(content[0].text, "[Image 1]: Description");
});
test("replaceImageParts does not modify original body", () => {
const body = {
model: "minimax/minimax-01",
messages: [
{
role: "user",
content: [
{ type: "text", text: "Original" },
{ type: "image_url", image_url: { url: "https://example.com/image.png" } },
],
},
],
};
const descriptions = ["[Image 1]: Modified"];
replaceImageParts(body, descriptions);
// Original should be unchanged
const content = body.messages[0].content as Array<{ type: string }>;
assert.strictEqual(content[1].type, "image_url");
});
test("replaceImageParts handles mixed images and text", () => {
const body = {
model: "test",
messages: [
{
role: "user",
content: [
{ type: "image_url", image_url: { url: "https://example.com/first.png" } },
{ type: "text", text: "between images" },
{ type: "image_url", image_url: { url: "https://example.com/second.png" } },
],
},
],
};
const descriptions = ["[Image 1]: First image", "[Image 2]: Second image"];
const result = replaceImageParts(body, descriptions);
const content = result.messages[0].content as Array<{ type: string; text?: string }>;
assert.strictEqual(content[0].type, "text");
assert.strictEqual(content[0].text, "[Image 1]: First image");
assert.strictEqual(content[1].type, "text");
assert.strictEqual(content[1].text, "between images");
assert.strictEqual(content[2].type, "text");
assert.strictEqual(content[2].text, "[Image 2]: Second image");
});
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