diff --git a/extensions/ql-vscode/test/unit-tests/common/short-paths.test.ts b/extensions/ql-vscode/test/unit-tests/common/short-paths.test.ts
new file mode 100644
index 000000000..7d379c38d
--- /dev/null
+++ b/extensions/ql-vscode/test/unit-tests/common/short-paths.test.ts
@@ -0,0 +1,96 @@
+import { platform } from "os";
+import type { BaseLogger } from "../../../src/common/logging";
+import { expandShortPaths } from "../../../src/common/short-paths";
+import { join } from "path";
+
+describe("expandShortPaths", () => {
+  let logger: BaseLogger;
+
+  beforeEach(() => {
+    logger = {
+      log: jest.fn(),
+    };
+  });
+
+  describe("on POSIX", () => {
+    if (platform() === "win32") {
+      console.log(`Skipping test on Windows`);
+      return;
+    }
+
+    it("should return the same path for non-Windows platforms", async () => {
+      const path = "/home/user/some~path";
+      const result = await expandShortPaths(path, logger);
+
+      expect(logger.log).not.toHaveBeenCalled();
+      expect(result).toBe(path);
+    });
+  });
+
+  describe("on Windows", () => {
+    if (platform() !== "win32") {
+      console.log(`Skipping test on non-Windows`);
+      return;
+    }
+
+    it("should return the same path if no short components", async () => {
+      const path = "C:\\Program Files\\Some Folder";
+      const result = await expandShortPaths(path, logger);
+
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short paths in: ${path}`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(
+        "Skipping due to no short components",
+      );
+      expect(result).toBe(path);
+    });
+
+    it("should not attempt to expand long paths with '~' in the name", async () => {
+      const testDir = join(__dirname, "../data/short-paths");
+      const path = join(testDir, "textfile-with~tilde.txt");
+      const result = await expandShortPaths(path, logger);
+
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short paths in: ${path}`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short path component: textfile-with~tilde.txt`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(`Component is not a short name`);
+      expect(result).toBe(join(testDir, "textfile-with~tilde.txt"));
+    });
+
+    it("should expand a short path", async () => {
+      const path = "C:\\PROGRA~1\\Some Folder";
+      const result = await expandShortPaths(path, logger);
+
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short paths in: ${path}`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short path component: PROGRA~1`,
+      );
+      expect(result).toBe("C:\\Program Files\\Some Folder");
+    });
+
+    it("should expand multiple short paths", async () => {
+      const testDir = join(__dirname, "../data/short-paths");
+      const path = join(testDir, "FOLDER~1", "TEXTFI~1.TXT");
+      const result = await expandShortPaths(path, logger);
+
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short paths in: ${path}`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short path component: FOLDER~1`,
+      );
+      expect(logger.log).toHaveBeenCalledWith(
+        `Expanding short path component: TEXTFI~1.TXT`,
+      );
+      expect(result).toBe(
+        join(testDir, "folder with space", ".textfile+extra.characters.txt"),
+      );
+    });
+  });
+});