1 files changed, 89 insertions, 0 deletions
diff --git a/src/features/chat/model-select.test.ts b/src/features/chat/model-select.test.ts
new file mode 100644
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--- /dev/null
+++ b/src/features/chat/model-select.test.ts
@@ -0,0 +1,89 @@
+import { describe, expect, it } from "vitest";
+import {
+  isVisionModel,
+  joinModelName,
+  modelKeys,
+  modelsForKey,
+  splitModelName,
+} from "./model-select";
+
+describe("splitModelName", () => {
+  it("splits on the first slash", () => {
+    expect(splitModelName("openai/gpt-4")).toEqual({ key: "openai", model: "gpt-4" });
+  });
+
+  it("keeps slashes in the model part (splits only the first)", () => {
+    expect(splitModelName("openrouter/anthropic/claude")).toEqual({
+      key: "openrouter",
+      model: "anthropic/claude",
+    });
+  });
+
+  it("treats a slashless name as all key", () => {
+    expect(splitModelName("local")).toEqual({ key: "local", model: "" });
+  });
+});
+
+describe("joinModelName", () => {
+  it("recombines key + model", () => {
+    expect(joinModelName("openai", "gpt-4")).toBe("openai/gpt-4");
+  });
+
+  it("returns just the key when the model is empty", () => {
+    expect(joinModelName("local", "")).toBe("local");
+  });
+
+  it("round-trips with splitModelName", () => {
+    const full = "openrouter/anthropic/claude";
+    const { key, model } = splitModelName(full);
+    expect(joinModelName(key, model)).toBe(full);
+  });
+});
+
+describe("modelKeys", () => {
+  it("returns distinct keys in first-seen order", () => {
+    expect(
+      modelKeys(["openai/gpt-4", "openai/gpt-4o", "anthropic/claude-3", "google/gemini"]),
+    ).toEqual(["openai", "anthropic", "google"]);
+  });
+
+  it("is empty for no models", () => {
+    expect(modelKeys([])).toEqual([]);
+  });
+});
+
+describe("modelsForKey", () => {
+  it("returns the model suffixes under a key, in order", () => {
+    const models = ["openai/gpt-4", "anthropic/claude-3", "openai/gpt-4o"];
+    expect(modelsForKey(models, "openai")).toEqual(["gpt-4", "gpt-4o"]);
+  });
+
+  it("returns empty for an unknown key", () => {
+    expect(modelsForKey(["openai/gpt-4"], "anthropic")).toEqual([]);
+  });
+});
+
+describe("isVisionModel", () => {
+  it("returns true when modelInfo[name].vision is true", () => {
+    const info = { "kimi/k2": { vision: true } };
+    expect(isVisionModel(info, "kimi/k2")).toBe(true);
+  });
+
+  it("returns false when vision is false", () => {
+    const info = { "umans/glm-5.2": { vision: false } };
+    expect(isVisionModel(info, "umans/glm-5.2")).toBe(false);
+  });
+
+  it("returns false when vision is absent (unknown)", () => {
+    const info = { "umans/glm-5.2": { contextWindow: 128000 } };
+    expect(isVisionModel(info, "umans/glm-5.2")).toBe(false);
+  });
+
+  it("returns false for a model with no metadata entry at all", () => {
+    expect(isVisionModel({}, "unknown/model")).toBe(false);
+  });
+
+  it("returns false for an empty modelInfo map", () => {
+    expect(isVisionModel({}, "kimi/k2")).toBe(false);
+  });
+});