diff --git a/test/migration-createAsset.test.ts b/test/migration-createAsset.test.ts
index eade34de..e22da05d 100644
--- a/test/migration-createAsset.test.ts
+++ b/test/migration-createAsset.test.ts
@@ -4,9 +4,10 @@ import * as prismic from "../src"
 import type { Asset } from "../src/types/api/asset/asset"
 import { AssetType } from "../src/types/api/asset/asset"
 
-// Skip test on Node 16 and 18
-const hasFileConstructor = typeof File === "function"
-const it = _it.skipIf(!hasFileConstructor)
+// Skip test on Node 16 and 18 (File and FormData support)
+const isNode16 = process.version.startsWith("v16")
+const isNode18 = process.version.startsWith("v18")
+const it = _it.skipIf(isNode16 || isNode18)
 
 it("creates an asset from a url", () => {
 	const migration = prismic.createMigration()
diff --git a/test/writeClient-createAsset.test.ts b/test/writeClient-createAsset.test.ts
index 34eaabf8..11748113 100644
--- a/test/writeClient-createAsset.test.ts
+++ b/test/writeClient-createAsset.test.ts
@@ -7,9 +7,10 @@ import { ForbiddenError } from "../src"
 import { UNKNOWN_RATE_LIMIT_DELAY } from "../src/BaseClient"
 import type { AssetTag } from "../src/types/api/asset/tag"
 
-// Skip test on Node 16 and 18
-const hasFileConstructor = typeof File === "function"
-const it = _it.skipIf(!hasFileConstructor)
+// Skip test on Node 16 and 18 (File and FormData support)
+const isNode16 = process.version.startsWith("v16")
+const isNode18 = process.version.startsWith("v18")
+const it = _it.skipIf(isNode16 || isNode18)
 
 it.concurrent("creates an asset from string content", async (ctx) => {
 	const client = createTestWriteClient({ ctx })
diff --git a/test/writeClient-createAssetTag.test.ts b/test/writeClient-createAssetTag.test.ts
index 7c1d6d7e..d153ecc1 100644
--- a/test/writeClient-createAssetTag.test.ts
+++ b/test/writeClient-createAssetTag.test.ts
@@ -1,4 +1,4 @@
-import { expect, it } from "vitest"
+import { it as _it, expect } from "vitest"
 
 import { createTestWriteClient } from "./__testutils__/createWriteClient"
 import { mockPrismicAssetAPI } from "./__testutils__/mockPrismicAssetAPI"
@@ -7,6 +7,10 @@ import { ForbiddenError } from "../src"
 import { UNKNOWN_RATE_LIMIT_DELAY } from "../src/BaseClient"
 import type { AssetTag } from "../src/types/api/asset/tag"
 
+// Skip test on Node 16 (FormData support)
+const isNode16 = process.version.startsWith("v16")
+const it = _it.skipIf(isNode16)
+
 it.concurrent("creates a tag", async (ctx) => {
 	const client = createTestWriteClient({ ctx })
 
diff --git a/test/writeClient-getAssets.test.ts b/test/writeClient-getAssets.test.ts
index f206e706..e3c694bd 100644
--- a/test/writeClient-getAssets.test.ts
+++ b/test/writeClient-getAssets.test.ts
@@ -1,4 +1,4 @@
-import { expect, it } from "vitest"
+import { it as _it, expect } from "vitest"
 
 import { createTestWriteClient } from "./__testutils__/createWriteClient"
 import { mockPrismicAssetAPI } from "./__testutils__/mockPrismicAssetAPI"
@@ -6,6 +6,10 @@ import { mockPrismicAssetAPI } from "./__testutils__/mockPrismicAssetAPI"
 import { ForbiddenError } from "../src"
 import { AssetType } from "../src/types/api/asset/asset"
 
+// Skip test on Node 16 (FormData support)
+const isNode16 = process.version.startsWith("v16")
+const it = _it.skipIf(isNode16)
+
 it.concurrent("get assets", async (ctx) => {
 	const client = createTestWriteClient({ ctx })
 
diff --git a/test/writeClient-migrate.test.ts b/test/writeClient-migrate.test.ts
index dce47ec8..342032a7 100644
--- a/test/writeClient-migrate.test.ts
+++ b/test/writeClient-migrate.test.ts
@@ -1,4 +1,4 @@
-import { expect, it } from "vitest"
+import { it as _it, expect, vi } from "vitest"
 
 import { createTestWriteClient } from "./__testutils__/createWriteClient"
 import { mockPrismicAssetAPI } from "./__testutils__/mockPrismicAssetAPI"
@@ -7,14 +7,32 @@ import { mockPrismicRestAPIV2 } from "./__testutils__/mockPrismicRestAPIV2"
 
 import * as prismic from "../src"
 
+// Skip test on Node 16 and 18 (File and FormData support)
+const isNode16 = process.version.startsWith("v16")
+const isNode18 = process.version.startsWith("v18")
+const it = _it.skipIf(isNode16 || isNode18)
+
 it("migrates nothing when migration is empty", async (ctx) => {
 	const client = createTestWriteClient({ ctx })
 
 	mockPrismicRestAPIV2({ ctx })
 	mockPrismicAssetAPI({ ctx, client })
-	mockPrismicMigrationAPI({ ctx, client })
+	// Not mocking migration API to test we're not calling it
+	// mockPrismicMigrationAPI({ ctx, client })
 
 	const migration = prismic.createMigration()
 
-	await expect(client.migrate(migration)).resolves.toBeUndefined()
+	const reporter = vi.fn()
+
+	await expect(client.migrate(migration, { reporter })).resolves.toBeUndefined()
+
+	expect(reporter).toHaveBeenCalledWith({
+		type: "end",
+		data: {
+			migrated: {
+				documents: 0,
+				assets: 0,
+			},
+		},
+	})
 })
diff --git a/test/writeClient.test.ts b/test/writeClient.test.ts
index bb8ea86b..b2ba0466 100644
--- a/test/writeClient.test.ts
+++ b/test/writeClient.test.ts
@@ -4,6 +4,7 @@ import * as prismic from "../src"
 
 it("`createWriteClient` creates a write client", () => {
 	const client = prismic.createWriteClient("qwerty", {
+		fetch: vi.fn(),
 		writeToken: "xxx",
 		migrationAPIKey: "yyy",
 	})
@@ -20,6 +21,7 @@ it("constructor warns if running in a browser-like environment", () => {
 		.mockImplementation(() => void 0)
 
 	prismic.createWriteClient("qwerty", {
+		fetch: vi.fn(),
 		writeToken: "xxx",
 		migrationAPIKey: "yyy",
 	})
@@ -34,6 +36,7 @@ it("constructor warns if running in a browser-like environment", () => {
 
 it("uses provided asset API endpoint and adds `/` suffix", () => {
 	const client = prismic.createWriteClient("qwerty", {
+		fetch: vi.fn(),
 		assetAPIEndpoint: "https://example.com",
 		writeToken: "xxx",
 		migrationAPIKey: "yyy",
@@ -44,6 +47,7 @@ it("uses provided asset API endpoint and adds `/` suffix", () => {
 
 it("uses provided migration API endpoint and adds `/` suffix", () => {
 	const client = prismic.createWriteClient("qwerty", {
+		fetch: vi.fn(),
 		migrationAPIEndpoint: "https://example.com",
 		writeToken: "xxx",
 		migrationAPIKey: "yyy",