diff --git a/tests/converters/dasel.test.ts b/tests/converters/dasel.test.ts
index adad804..b08bed9 100644
--- a/tests/converters/dasel.test.ts
+++ b/tests/converters/dasel.test.ts
@@ -55,7 +55,7 @@ describe("convert", () => {
 
   test("should reject if execFile returns an error", async () => {
     mockExecFile = (cmd, args, callback) => callback(new Error("fail"), "", "");
-    expect(
+    await expect(
       convert("input.yaml", "yaml", "json", "output.json", undefined, mockExecFile),
     ).rejects.toMatch(/error: Error: fail/);
   });
@@ -63,7 +63,7 @@ describe("convert", () => {
   test("should reject if writeFile fails", async () => {
     // @ts-expect-error: property __promisify__ is missing
     fs.writeFile = (path, data, cb) => cb(new Error("write fail"));
-    expect(
+    await expect(
       convert("input.yaml", "yaml", "json", "output.json", undefined, (cmd, args, cb) =>
         cb(null, "output-data", ""),
       ),
diff --git a/tests/converters/libreoffice.test.ts b/tests/converters/libreoffice.test.ts
index 8e6dcf5..3984967 100644
--- a/tests/converters/libreoffice.test.ts
+++ b/tests/converters/libreoffice.test.ts
@@ -108,14 +108,14 @@ test("strips leading './' from outdir", async () => {
 // --- promise settlement ------------------------------------------------------
 test("resolves with 'Done' when execFile succeeds", async () => {
   behavior = { kind: "success", stdout: "fine", stderr: "" };
-  expect(convert("in.txt", "txt", "docx", "out/out.docx", undefined, mockExecFile)).resolves.toBe(
+  await expect(convert("in.txt", "txt", "docx", "out/out.docx", undefined, mockExecFile)).resolves.toBe(
     "Done",
   );
 });
 
 test("rejects when execFile returns an error", async () => {
   behavior = { kind: "error", message: "convert failed", stderr: "oops" };
-  expect(convert("in.txt", "txt", "docx", "out/out.docx", undefined, mockExecFile)).rejects.toMatch(
+  await expect(convert("in.txt", "txt", "docx", "out/out.docx", undefined, mockExecFile)).rejects.toMatch(
     /error: Error: convert failed/,
   );
 });
diff --git a/tests/converters/pandoc.test.ts b/tests/converters/pandoc.test.ts
index 168d6f8..c910d6c 100644
--- a/tests/converters/pandoc.test.ts
+++ b/tests/converters/pandoc.test.ts
@@ -59,7 +59,7 @@ describe("convert", () => {
 
   test("should reject if execFile returns an error", async () => {
     mockExecFile = (cmd, args, callback) => callback(new Error("fail"), "", "");
-    expect(
+    await expect(
       convert("input.md", "markdown", "html", "output.html", undefined, mockExecFile),
     ).rejects.toMatch(/error: Error: fail/);
   });
diff --git a/tests/converters/vtracer.test.ts b/tests/converters/vtracer.test.ts
index e68cb4a..365748e 100644
--- a/tests/converters/vtracer.test.ts
+++ b/tests/converters/vtracer.test.ts
@@ -51,7 +51,7 @@ describe("convert", () => {
 
   test("should reject if execFile returns an error", async () => {
     mockExecFile = (cmd, args, callback) => callback(new Error("fail"), "", "stderr output");
-    expect(
+    await expect(
       convert("input.png", "png", "svg", "output.svg", undefined, mockExecFile),
     ).rejects.toMatch(/error: Error: fail\nstderr: stderr output/);
   });