diff --git a/src/testing/core/__tests__/createProxiedSchema.test.tsx b/src/testing/core/__tests__/createProxiedSchema.test.tsx
index b10b0121f0e..7128b69825b 100644
--- a/src/testing/core/__tests__/createProxiedSchema.test.tsx
+++ b/src/testing/core/__tests__/createProxiedSchema.test.tsx
@@ -861,7 +861,6 @@ describe("schema proxy", () => {
       },
       Book: {
         __resolveType: (obj) => {
-          console.log(obj);
           if ("text" in obj) {
             return "TextBook";
           }
@@ -1028,7 +1027,209 @@ describe("schema proxy", () => {
 
     unmount();
   });
-  it.todo("add test for reset");
-  it.todo("add test for mergeResolvers: false");
-  it.todo("add test for mergeResolvers: true");
+
+  describe("schema.reset", () => {
+    const resetTestSchema = createProxiedSchema(schemaWithMocks, {
+      Query: {
+        viewer: () => ({
+          book: {
+            text: "Hello World",
+            title: "Orlando: A Biography",
+          },
+        }),
+      },
+      Book: {
+        __resolveType: (obj) => {
+          if ("text" in obj) {
+            return "TextBook";
+          }
+          if ("colors" in obj) {
+            return "ColoringBook";
+          }
+          throw new Error("Could not resolve type");
+        },
+      },
+    });
+    it("setup test where we add resolvers to schema", async () => {
+      const Profiler = createDefaultProfiler<ViewerQueryData>();
+
+      resetTestSchema.add({
+        resolvers: {
+          Query: {
+            viewer: () => ({
+              book: {
+                text: "Hello World",
+                title: "The Waves",
+              },
+            }),
+          },
+        },
+      });
+
+      using _fetch = createMockFetch(resetTestSchema);
+
+      const client = new ApolloClient({
+        cache: new InMemoryCache(),
+        uri,
+      });
+
+      const query: TypedDocumentNode<ViewerQueryData> = gql`
+        query {
+          viewer {
+            id
+            name
+            age
+            book {
+              id
+              title
+              publishedAt
+              ... on ColoringBook {
+                colors
+              }
+            }
+          }
+        }
+      `;
+
+      const Fallback = () => {
+        useTrackRenders();
+        return <div>Loading...</div>;
+      };
+
+      const App = () => {
+        return (
+          <React.Suspense fallback={<Fallback />}>
+            <Child />
+          </React.Suspense>
+        );
+      };
+
+      const Child = () => {
+        const result = useSuspenseQuery(query);
+
+        useTrackRenders();
+
+        Profiler.mergeSnapshot({
+          result,
+        } as Partial<{}>);
+
+        return <div>Hello</div>;
+      };
+
+      const { unmount } = renderWithClient(<App />, {
+        client,
+        wrapper: Profiler,
+      });
+
+      // initial suspended render
+      await Profiler.takeRender();
+
+      {
+        const { snapshot } = await Profiler.takeRender();
+
+        expect(snapshot.result?.data).toEqual({
+          viewer: {
+            __typename: "User",
+            age: 42,
+            id: "1",
+            name: "String",
+            book: {
+              __typename: "TextBook",
+              id: "1",
+              publishedAt: "2024-01-01",
+              // value set in this test with .add
+              title: "The Waves",
+            },
+          },
+        });
+      }
+
+      unmount();
+    });
+    it("resets the schema to the original", async () => {
+      const Profiler = createDefaultProfiler<ViewerQueryData>();
+
+      resetTestSchema.reset();
+
+      using _fetch = createMockFetch(resetTestSchema);
+
+      const client = new ApolloClient({
+        cache: new InMemoryCache(),
+        uri,
+      });
+
+      const query: TypedDocumentNode<ViewerQueryData> = gql`
+        query {
+          viewer {
+            id
+            name
+            age
+            book {
+              id
+              title
+              publishedAt
+              ... on ColoringBook {
+                colors
+              }
+            }
+          }
+        }
+      `;
+
+      const Fallback = () => {
+        useTrackRenders();
+        return <div>Loading...</div>;
+      };
+
+      const App = () => {
+        return (
+          <React.Suspense fallback={<Fallback />}>
+            <Child />
+          </React.Suspense>
+        );
+      };
+
+      const Child = () => {
+        const result = useSuspenseQuery(query);
+
+        useTrackRenders();
+
+        Profiler.mergeSnapshot({
+          result,
+        } as Partial<{}>);
+
+        return <div>Hello</div>;
+      };
+
+      const { unmount } = renderWithClient(<App />, {
+        client,
+        wrapper: Profiler,
+      });
+
+      // initial suspended render
+      await Profiler.takeRender();
+
+      {
+        const { snapshot } = await Profiler.takeRender();
+
+        expect(snapshot.result?.data).toEqual({
+          viewer: {
+            __typename: "User",
+            age: 42,
+            id: "1",
+            name: "String",
+            book: {
+              __typename: "TextBook",
+              id: "1",
+              publishedAt: "2024-01-01",
+              // original value
+              title: "Orlando: A Biography",
+            },
+          },
+        });
+      }
+
+      unmount();
+    });
+  });
 });
diff --git a/src/testing/core/createProxiedSchema.ts b/src/testing/core/createProxiedSchema.ts
index 092a7eb6b1f..26b792532d7 100644
--- a/src/testing/core/createProxiedSchema.ts
+++ b/src/testing/core/createProxiedSchema.ts
@@ -11,10 +11,6 @@ interface ProxiedSchemaFns {
   reset: () => void;
 }
 
-type CreateProxiedSchemaOptions = {
-  mergeResolvers: boolean;
-};
-
 /**
  * A function that creates a [Proxy object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy)
  * around a given `schema` with `resolvers`. This proxied schema can be used to
@@ -49,10 +45,7 @@ type CreateProxiedSchemaOptions = {
  */
 const createProxiedSchema = (
   schemaWithMocks: GraphQLSchema,
-  resolvers: Resolvers,
-  options: CreateProxiedSchemaOptions = {
-    mergeResolvers: true,
-  }
+  resolvers: Resolvers
 ): ProxiedSchema => {
   let targetResolvers = { ...resolvers };
   let targetSchema = addResolversToSchema({
@@ -63,10 +56,7 @@ const createProxiedSchema = (
   const fns: ProxiedSchemaFns = {
     add: ({ resolvers: newResolvers }) => {
       // @ts-ignore TODO(fixme): IResolvers type does not play well with our Resolvers
-      targetResolvers =
-        options.mergeResolvers ?
-          mergeResolvers([targetResolvers, newResolvers])
-        : { ...targetResolvers, ...newResolvers };
+      targetResolvers = mergeResolvers([targetResolvers, newResolvers]);
 
       targetSchema = addResolversToSchema({
         schema: targetSchema,
@@ -77,11 +67,7 @@ const createProxiedSchema = (
     },
 
     fork: ({ resolvers: newResolvers } = {}) => {
-      return createProxiedSchema(
-        targetSchema,
-        newResolvers ?? targetResolvers,
-        options
-      );
+      return createProxiedSchema(targetSchema, newResolvers ?? targetResolvers);
     },
 
     reset: () => {