diff --git a/test/integration/helpers/level1-assertions.ts b/test/integration/helpers/level1-assertions.ts
index ed4242f..5833809 100644
--- a/test/integration/helpers/level1-assertions.ts
+++ b/test/integration/helpers/level1-assertions.ts
@@ -20,8 +20,11 @@ export function expectNonEmptyResults<T>(
   value: ResultsContainer<T>,
   minimum = 1,
 ): asserts value is { results: T[] } {
-  expect(value.results).toBeDefined();
-  expect(value.results!.length).toBeGreaterThanOrEqual(minimum);
+  if (!Array.isArray(value.results)) {
+    throw new Error("Expected a results array");
+  }
+
+  expect(value.results.length).toBeGreaterThanOrEqual(minimum);
 }
 
 /**
@@ -36,8 +39,12 @@ export function expectFeatureCollectionWithFeatures<TFeature>(
   minimum = 1,
 ): asserts value is { type: "FeatureCollection"; features: TFeature[] } {
   expect(value.type).toBe("FeatureCollection");
-  expect(value.features).toBeDefined();
-  expect(value.features!.length).toBeGreaterThanOrEqual(minimum);
+
+  if (!Array.isArray(value.features)) {
+    throw new Error("Expected a features array");
+  }
+
+  expect(value.features.length).toBeGreaterThanOrEqual(minimum);
 }
 
 /**
diff --git a/tsconfig.test.json b/tsconfig.test.json
index b73c149..8118f6b 100644
--- a/tsconfig.test.json
+++ b/tsconfig.test.json
@@ -6,12 +6,11 @@
     "module": "ESNext",
     "moduleResolution": "bundler",
     "types": [
-      "vitest/globals",
+      "vitest",
       "node"
     ]
   },
   "include": [
-    "./src/**/*",
     "./test/**/*",
     "./vitest*.mts"
   ],