1 files changed, 90 insertions, 0 deletions
diff --git a/src/features/system-prompt/logic/view-model.test.ts b/src/features/system-prompt/logic/view-model.test.ts
new file mode 100644
index 0000000..223327b
--- /dev/null
+++ b/src/features/system-prompt/logic/view-model.test.ts
@@ -0,0 +1,90 @@
+import type { SystemPromptVariable } from "@dispatch/transport-contract";
+import { describe, expect, it } from "vitest";
+import {
+  buildIfNotTag,
+  buildIfTag,
+  buildTag,
+  groupVariables,
+  insertTag,
+  isDynamicVariable,
+} from "./view-model";
+
+describe("system-prompt view-model", () => {
+  describe("buildTag", () => {
+    it("builds a variable placeholder", () => {
+      expect(buildTag("system", "time")).toBe("[system:time]");
+    });
+  });
+
+  describe("buildIfTag", () => {
+    it("builds an opening conditional tag", () => {
+      expect(buildIfTag("file", "AGENTS.md")).toBe("[if file:AGENTS.md]");
+    });
+  });
+
+  describe("buildIfNotTag", () => {
+    it("builds a negated opening conditional tag", () => {
+      expect(buildIfNotTag("prompt", "cwd")).toBe("[if !prompt:cwd]");
+    });
+  });
+
+  describe("insertTag", () => {
+    it("inserts a tag at the cursor position", () => {
+      expect(insertTag("Hello world", "[system:time]", 5, 5)).toEqual({
+        template: "Hello[system:time] world",
+        cursor: 18,
+      });
+    });
+
+    it("replaces the selected text", () => {
+      const tag = buildTag("file", "README.md");
+      expect(insertTag("Hello world", tag, 6, 11)).toEqual({
+        template: `Hello ${tag}`,
+        cursor: 6 + tag.length,
+      });
+    });
+
+    it("inserts at the end", () => {
+      const tag = buildTag("git", "branch");
+      expect(insertTag("", tag, 0, 0)).toEqual({
+        template: tag,
+        cursor: tag.length,
+      });
+    });
+  });
+
+  describe("groupVariables", () => {
+    it("groups by type in first-appearing order", () => {
+      const variables: SystemPromptVariable[] = [
+        { type: "system", name: "time", description: "" },
+        { type: "prompt", name: "cwd", description: "" },
+        { type: "system", name: "date", description: "" },
+        { type: "git", name: "branch", description: "" },
+      ];
+      const groups = groupVariables(variables);
+      expect(groups.map((g) => g.type)).toEqual(["system", "prompt", "git"]);
+      expect(groups[0]?.variables.map((v) => v.name)).toEqual(["time", "date"]);
+      expect(groups[1]?.variables.map((v) => v.name)).toEqual(["cwd"]);
+      expect(groups[2]?.variables.map((v) => v.name)).toEqual(["branch"]);
+    });
+
+    it("returns an empty array when no variables", () => {
+      expect(groupVariables([])).toEqual([]);
+    });
+  });
+
+  describe("isDynamicVariable", () => {
+    it("returns true when dynamic is true", () => {
+      expect(
+        isDynamicVariable({ type: "file", name: "path", description: "", dynamic: true }),
+      ).toBe(true);
+    });
+
+    it("returns false when dynamic is missing or false", () => {
+      expect(isDynamicVariable({ type: "system", name: "time", description: "" })).toBe(false);
+      expect(
+        isDynamicVariable({ type: "system", name: "time", description: "", dynamic: false }),
+      ).toBe(false);
+    });
+  });
+});