diff --git a/src/coverage.test.ts b/src/coverage.test.ts
new file mode 100644
index 0000000..7a1ee3a
--- /dev/null
+++ b/src/coverage.test.ts
@@ -0,0 +1,51 @@
+import coverage from "./coverage";
+import { OpenRPC } from "@open-rpc/meta-schema";
+
+
+
+const mockSchema = {
+  openrpc: "1.0.0",
+  info: {
+    title: "my api",
+    version: "0.0.0-development"
+  },
+  methods: [
+    {
+      name: 'foo',
+      params: [],
+      result: {
+        name: 'fooResult',
+        schema: {
+          type: 'boolean'
+        }
+      }
+    }
+  ]
+} as OpenRPC
+
+
+describe('coverage', () => {
+  it('can call the reporter', (done) => {
+    const reporter = () => done()
+    const transport = () => Promise.resolve({})
+    coverage({
+      reporter,
+      transport,
+      schema: mockSchema,
+      skipMethods: []
+    })
+  })
+  it('can call the transport', (done) => {
+    const reporter = () => {}
+    const transport = () => {
+      done();
+      return Promise.resolve({});
+    }
+    coverage({
+      reporter,
+      transport,
+      schema: mockSchema,
+      skipMethods: []
+    })
+  })
+});
\ No newline at end of file
diff --git a/src/coverage.ts b/src/coverage.ts
index 0df9da4..70f0605 100644
--- a/src/coverage.ts
+++ b/src/coverage.ts
@@ -9,8 +9,6 @@ const getParams = async (params: any[]) => {
   return Promise.all(promises);
 }
 
-let schema: OpenRPC;
-
 const results: any[] = [];
 
 interface IOptions {