diff --git a/packages/query-devtools/src/__tests__/TanstackQueryDevtools.test.tsx b/packages/query-devtools/src/__tests__/TanstackQueryDevtools.test.tsx
index 01c8969f3a..cef4475d83 100644
--- a/packages/query-devtools/src/__tests__/TanstackQueryDevtools.test.tsx
+++ b/packages/query-devtools/src/__tests__/TanstackQueryDevtools.test.tsx
@@ -56,4 +56,61 @@ describe('TanstackQueryDevtools', () => {
       expect(() => devtools.unmount()).toThrow('Devtools is not mounted')
     })
   })
+
+  describe('setters', () => {
+    describe('before mount', () => {
+      it('should not throw when "setButtonPosition" is called', () => {
+        expect(() => devtools.setButtonPosition('top-left')).not.toThrow()
+      })
+
+      it('should not throw when "setPosition" is called', () => {
+        expect(() => devtools.setPosition('left')).not.toThrow()
+      })
+
+      it('should not throw when "setInitialIsOpen" is called', () => {
+        expect(() => devtools.setInitialIsOpen(true)).not.toThrow()
+      })
+
+      it('should not throw when "setErrorTypes" is called', () => {
+        expect(() =>
+          devtools.setErrorTypes([
+            { name: 'NetworkError', initializer: () => new Error('Network') },
+          ]),
+        ).not.toThrow()
+      })
+
+      it('should not throw when "setClient" is called', () => {
+        expect(() => devtools.setClient(new QueryClient())).not.toThrow()
+      })
+
+      it('should not throw when "setTheme" is called', () => {
+        expect(() => devtools.setTheme('dark')).not.toThrow()
+        expect(() => devtools.setTheme('light')).not.toThrow()
+        expect(() => devtools.setTheme('system')).not.toThrow()
+        expect(() => devtools.setTheme(undefined)).not.toThrow()
+      })
+    })
+
+    describe('after mount', () => {
+      it('should not throw when setters are called on a mounted instance', () => {
+        const el = document.createElement('div')
+        devtools.mount(el)
+
+        try {
+          expect(() => devtools.setButtonPosition('top-left')).not.toThrow()
+          expect(() => devtools.setPosition('left')).not.toThrow()
+          expect(() => devtools.setInitialIsOpen(true)).not.toThrow()
+          expect(() =>
+            devtools.setErrorTypes([
+              { name: 'NetworkError', initializer: () => new Error('Network') },
+            ]),
+          ).not.toThrow()
+          expect(() => devtools.setClient(new QueryClient())).not.toThrow()
+          expect(() => devtools.setTheme('dark')).not.toThrow()
+        } finally {
+          devtools.unmount()
+        }
+      })
+    })
+  })
 })
diff --git a/packages/query-devtools/src/__tests__/TanstackQueryDevtoolsPanel.test.tsx b/packages/query-devtools/src/__tests__/TanstackQueryDevtoolsPanel.test.tsx
index 1993ef6779..f7407ad5ff 100644
--- a/packages/query-devtools/src/__tests__/TanstackQueryDevtoolsPanel.test.tsx
+++ b/packages/query-devtools/src/__tests__/TanstackQueryDevtoolsPanel.test.tsx
@@ -56,4 +56,66 @@ describe('TanstackQueryDevtoolsPanel', () => {
       expect(() => devtools.unmount()).toThrow('Devtools is not mounted')
     })
   })
+
+  describe('setters', () => {
+    describe('before mount', () => {
+      it('should not throw when "setButtonPosition" is called', () => {
+        expect(() => devtools.setButtonPosition('top-left')).not.toThrow()
+      })
+
+      it('should not throw when "setPosition" is called', () => {
+        expect(() => devtools.setPosition('left')).not.toThrow()
+      })
+
+      it('should not throw when "setInitialIsOpen" is called', () => {
+        expect(() => devtools.setInitialIsOpen(true)).not.toThrow()
+      })
+
+      it('should not throw when "setErrorTypes" is called', () => {
+        expect(() =>
+          devtools.setErrorTypes([
+            { name: 'NetworkError', initializer: () => new Error('Network') },
+          ]),
+        ).not.toThrow()
+      })
+
+      it('should not throw when "setClient" is called', () => {
+        expect(() => devtools.setClient(new QueryClient())).not.toThrow()
+      })
+
+      it('should not throw when "setOnClose" is called', () => {
+        expect(() => devtools.setOnClose(() => {})).not.toThrow()
+      })
+
+      it('should not throw when "setTheme" is called', () => {
+        expect(() => devtools.setTheme('dark')).not.toThrow()
+        expect(() => devtools.setTheme('light')).not.toThrow()
+        expect(() => devtools.setTheme('system')).not.toThrow()
+        expect(() => devtools.setTheme(undefined)).not.toThrow()
+      })
+    })
+
+    describe('after mount', () => {
+      it('should not throw when setters are called on a mounted instance', () => {
+        const el = document.createElement('div')
+        devtools.mount(el)
+
+        try {
+          expect(() => devtools.setButtonPosition('top-left')).not.toThrow()
+          expect(() => devtools.setPosition('left')).not.toThrow()
+          expect(() => devtools.setInitialIsOpen(true)).not.toThrow()
+          expect(() =>
+            devtools.setErrorTypes([
+              { name: 'NetworkError', initializer: () => new Error('Network') },
+            ]),
+          ).not.toThrow()
+          expect(() => devtools.setClient(new QueryClient())).not.toThrow()
+          expect(() => devtools.setOnClose(() => {})).not.toThrow()
+          expect(() => devtools.setTheme('dark')).not.toThrow()
+        } finally {
+          devtools.unmount()
+        }
+      })
+    })
+  })
 })