diff --git a/packages/snaps-simulator/jest.config.js b/packages/snaps-simulator/jest.config.js
index e3fddc4590..1588c3a2e7 100644
--- a/packages/snaps-simulator/jest.config.js
+++ b/packages/snaps-simulator/jest.config.js
@@ -7,10 +7,10 @@ delete baseConfig.transform;
 module.exports = deepmerge(baseConfig, {
   coverageThreshold: {
     global: {
-      branches: 55.98,
-      functions: 61.72,
-      lines: 81.48,
-      statements: 81.71,
+      branches: 54.18,
+      functions: 60.76,
+      lines: 80.49,
+      statements: 80.83,
     },
   },
   setupFiles: ['./jest.setup.js'],
diff --git a/packages/snaps-simulator/src/contexts/utils.test.ts b/packages/snaps-simulator/src/contexts/utils.test.ts
new file mode 100644
index 0000000000..18736e9e70
--- /dev/null
+++ b/packages/snaps-simulator/src/contexts/utils.test.ts
@@ -0,0 +1,19 @@
+import { mergeValue } from './utils';
+
+describe('mergeValue', () => {
+  it('merges a value outside of a form', () => {
+    const state = { foo: 'bar' };
+
+    const result = mergeValue(state, 'foo', 'baz');
+
+    expect(result).toStrictEqual({ foo: 'baz' });
+  });
+
+  it('merges a value inside of a form', () => {
+    const state = { foo: { bar: 'baz' } };
+
+    const result = mergeValue(state, 'bar', 'test', 'foo');
+
+    expect(result).toStrictEqual({ foo: { bar: 'test' } });
+  });
+});
diff --git a/packages/snaps-simulator/src/features/simulation/slice.test.ts b/packages/snaps-simulator/src/features/simulation/slice.test.ts
index cdb482ae0d..5c7b90e7c3 100644
--- a/packages/snaps-simulator/src/features/simulation/slice.test.ts
+++ b/packages/snaps-simulator/src/features/simulation/slice.test.ts
@@ -1,6 +1,9 @@
 import type { IframeExecutionService } from '@metamask/snaps-controllers';
+import type { SnapId } from '@metamask/snaps-sdk';
+import { Text } from '@metamask/snaps-sdk/jsx';
 import { VirtualFile } from '@metamask/snaps-utils';
 
+import type { SnapInterface } from './slice';
 import {
   SnapStatus,
   simulation as reducer,
@@ -13,7 +16,11 @@ import {
   setSnapState,
   setUnencryptedSnapState,
   setLocalizationFiles,
+  setSnapInterface,
+  setSnapInterfaceController,
+  setSnapInterfaceState,
 } from './slice';
+import { getSnapInterfaceController } from './test/controllers';
 import { MockExecutionService } from './test/mockExecutionService';
 import { MOCK_MANIFEST, MOCK_MANIFEST_FILE } from './test/mockManifest';
 
@@ -39,6 +46,21 @@ describe('simulation slice', () => {
     });
   });
 
+  describe('setSnapInterfaceController', () => {
+    it('sets the snap interface controller', () => {
+      const snapInterfaceController = getSnapInterfaceController();
+
+      const result = reducer(
+        INITIAL_STATE,
+        setSnapInterfaceController(snapInterfaceController),
+      );
+
+      expect(result.snapInterfaceController).toStrictEqual(
+        snapInterfaceController,
+      );
+    });
+  });
+
   describe('setSourceCode', () => {
     it('sets the source code', () => {
       const result = reducer(
@@ -97,4 +119,31 @@ describe('simulation slice', () => {
       expect(result.manifest?.result).toStrictEqual(MOCK_MANIFEST);
     });
   });
+
+  describe('setSnapInterface', () => {
+    it('sets the snap interface', () => {
+      const snapInterface = {
+        id: 'foo',
+        snapId: 'bar' as SnapId,
+        content: Text({ children: 'Hello, world!' }),
+        context: null,
+        state: {},
+      };
+      const result = reducer(INITIAL_STATE, setSnapInterface(snapInterface));
+
+      expect(result.snapInterface).toStrictEqual(snapInterface);
+    });
+  });
+
+  describe('setSnapInterfaceState', () => {
+    it('sets the snap interface state', () => {
+      const state = { foo: 'bar' };
+      const result = reducer(
+        { ...INITIAL_STATE, snapInterface: { state: {} } as SnapInterface },
+        setSnapInterfaceState(state),
+      );
+
+      expect(result.snapInterface?.state).toStrictEqual(state);
+    });
+  });
 });
diff --git a/packages/snaps-simulator/src/utils/render.test.tsx b/packages/snaps-simulator/src/utils/render.test.tsx
new file mode 100644
index 0000000000..cdd27ef250
--- /dev/null
+++ b/packages/snaps-simulator/src/utils/render.test.tsx
@@ -0,0 +1,29 @@
+import { Bold, Text } from '@metamask/snaps-sdk/jsx';
+import { getJsxChildren } from '@metamask/snaps-utils';
+
+import { SnapComponent } from '../features/renderer';
+import { renderTextChildren } from './render';
+
+describe('renderTextChildren', () => {
+  it('returns a sting child', () => {
+    const element = Text({ children: 'Hello, world!' });
+
+    const result = renderTextChildren(getJsxChildren(element), 'test');
+
+    expect(result).toStrictEqual(['Hello, world!']);
+  });
+
+  it('returns a JSX child', () => {
+    const element = Text({ children: Bold({ children: 'Hello world' }) });
+
+    const result = renderTextChildren(getJsxChildren(element), 'test');
+
+    expect(result).toStrictEqual([
+      <SnapComponent
+        key={`test-text-child-0`}
+        id={`test-text-child-0`}
+        node={Bold({ children: 'Hello world' })}
+      />,
+    ]);
+  });
+});
diff --git a/packages/snaps-utils/coverage.json b/packages/snaps-utils/coverage.json
index 5c81ad80bf..242404e284 100644
--- a/packages/snaps-utils/coverage.json
+++ b/packages/snaps-utils/coverage.json
@@ -1,6 +1,6 @@
 {
-  "branches": 96.56,
-  "functions": 98.4,
-  "lines": 98.52,
-  "statements": 94.71
+  "branches": 96.82,
+  "functions": 98.8,
+  "lines": 98.87,
+  "statements": 95.02
 }
diff --git a/packages/snaps-utils/src/ui.test.tsx b/packages/snaps-utils/src/ui.test.tsx
index 34b6510fbf..7d3cf350f7 100644
--- a/packages/snaps-utils/src/ui.test.tsx
+++ b/packages/snaps-utils/src/ui.test.tsx
@@ -42,6 +42,7 @@ import {
   walkJsx,
   getJsxChildren,
   serialiseJsx,
+  getJsxInterface,
 } from './ui';
 
 describe('getTextChildren', () => {
@@ -986,3 +987,31 @@ describe('serialiseJsx', () => {
     `);
   });
 });
+
+describe('getJsxInterface', () => {
+  it('returns the JSX interface for a JSX element', () => {
+    expect(
+      getJsxInterface(
+        <Box>
+          <Text>Hello</Text>
+        </Box>,
+      ),
+    ).toStrictEqual(
+      Box({
+        children: Text({
+          children: 'Hello',
+        }),
+      }),
+    );
+  });
+
+  it('returns the JSX interface for a legacy element', () => {
+    expect(getJsxInterface(panel([text('Hello')]))).toStrictEqual(
+      Box({
+        children: Text({
+          children: 'Hello',
+        }),
+      }),
+    );
+  });
+});