diff --git a/extensions/ql-vscode/test/vscode-tests/cli-integration/data-extensions-editor/modeled-method-fs.test.ts b/extensions/ql-vscode/test/vscode-tests/cli-integration/data-extensions-editor/modeled-method-fs.test.ts
new file mode 100644
index 000000000..cf908667d
--- /dev/null
+++ b/extensions/ql-vscode/test/vscode-tests/cli-integration/data-extensions-editor/modeled-method-fs.test.ts
@@ -0,0 +1,128 @@
+import { Uri, workspace } from "vscode";
+import * as tmp from "tmp";
+import { CodeQLCliServer } from "../../../../src/codeql-cli/cli";
+import { getActivatedExtension } from "../../global.helper";
+import { mkdirSync, writeFileSync } from "fs";
+import { listModelFiles } from "../../../../src/data-extensions-editor/modeled-method-fs";
+import { join } from "path";
+
+const dummyExtensionPackContents = `
+name: dummy/pack
+version: 0.0.0
+library: true
+extensionTargets:
+  codeql/java-all: '*'
+dataExtensions:
+  - models/**/*.yml
+`;
+
+const dummyModelContents = `
+extensions:
+  - addsTo:
+      pack: codeql/java-all
+      extensible: sourceModel
+    data: []
+
+  - addsTo:
+      pack: codeql/java-all
+      extensible: sinkModel
+    data: []
+
+  - addsTo:
+      pack: codeql/java-all
+      extensible: summaryModel
+    data: []
+
+  - addsTo:
+      pack: codeql/java-all
+      extensible: neutralModel
+    data: []
+`;
+
+describe("listModelFiles", () => {
+  let tmpDir: string;
+  let tmpDirRemoveCallback: (() => void) | undefined;
+  let workspacePath: string;
+  let cli: CodeQLCliServer;
+
+  beforeEach(async () => {
+    const t = tmp.dirSync();
+    tmpDir = t.name;
+    tmpDirRemoveCallback = t.removeCallback;
+
+    const workspaceFolder = {
+      uri: Uri.file(join(tmpDir, "workspace")),
+      name: "workspace",
+      index: 0,
+    };
+    workspacePath = workspaceFolder.uri.fsPath;
+    mkdirSync(workspacePath);
+    jest
+      .spyOn(workspace, "workspaceFolders", "get")
+      .mockReturnValue([workspaceFolder]);
+
+    const extension = await getActivatedExtension();
+    cli = extension.cliServer;
+  });
+
+  afterEach(() => {
+    tmpDirRemoveCallback?.();
+  });
+
+  function makeExtensionPack(
+    extensionPackName: string,
+    modelFileNames: string[],
+  ): string {
+    const extensionPackPath = join(workspacePath, extensionPackName);
+    mkdirSync(extensionPackPath);
+
+    writeFileSync(
+      join(extensionPackPath, "codeql-pack.yml"),
+      dummyExtensionPackContents,
+    );
+
+    mkdirSync(join(extensionPackPath, "models"));
+    for (const filename of modelFileNames) {
+      writeFileSync(
+        join(extensionPackPath, "models", filename),
+        dummyModelContents,
+      );
+    }
+
+    return extensionPackPath;
+  }
+
+  it("should return the empty set when the extension pack is empty", async () => {
+    const extensionPackPath = makeExtensionPack("extension-pack", []);
+
+    const modelFiles = await listModelFiles(extensionPackPath, cli);
+    expect(modelFiles).toEqual(new Set());
+  });
+
+  it("should find all model files", async () => {
+    const extensionPackPath = makeExtensionPack("extension-pack", [
+      "library1.model.yml",
+      "library2.model.yml",
+    ]);
+
+    const modelFiles = await listModelFiles(extensionPackPath, cli);
+    expect(modelFiles).toEqual(
+      new Set([
+        join(extensionPackPath, "models", "library1.model.yml"),
+        join(extensionPackPath, "models", "library2.model.yml"),
+      ]),
+    );
+  });
+
+  it("should ignore model files from other extension packs", async () => {
+    const extensionPackPath = makeExtensionPack("extension-pack", [
+      "library1.model.yml",
+    ]);
+    makeExtensionPack("another-extension-pack", ["library2.model.yml"]);
+
+    const modelFiles = await listModelFiles(extensionPackPath, cli);
+    expect(modelFiles).toEqual(
+      new Set([join(extensionPackPath, "models", "library1.model.yml")]),
+    );
+  });
+});