fix: rename functional to zemu

tests/zemu/setupTests.js

@@ -0,0 +1,19 @@
+import expect from 'expect'
+
+expect.extend({
+    toMatchSnapshot(received, original) {
+
+      if(received.data.equals(original.data)){
+        return {
+          message: () => `snapshots are equal`,
+          pass: true
+        }
+      } else {
+        console.log("snapshots are not equal")
+        return {
+          message: () => `snapshots are not equal`,
+          pass: false
+        }
+      }
+    },
+  });