diff --git a/packages/strapi-plugin-content-manager/admin/src/containers/Main/tests/reducer.test.js b/packages/strapi-plugin-content-manager/admin/src/containers/Main/tests/reducer.test.js
new file mode 100644
index 0000000000..7ae576c919
--- /dev/null
+++ b/packages/strapi-plugin-content-manager/admin/src/containers/Main/tests/reducer.test.js
@@ -0,0 +1,144 @@
+import { fromJS } from 'immutable';
+import {
+  deleteLayout,
+  deleteLayouts,
+  resetListLabels,
+  onChangeListLabels,
+} from '../actions';
+import mainReducer from '../reducer';
+
+describe('Content Manager | Main | reducer', () => {
+  let state;
+
+  beforeEach(() => {
+    state = {
+      groupsAndModelsMainPossibleMainFields: {},
+      groups: [],
+      initialLayouts: {
+        test: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['test'],
+          },
+        },
+        otherTest: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['otherTest'],
+          },
+        },
+      },
+      isLoading: true,
+      layouts: {
+        test: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['test'],
+          },
+        },
+        otherTest: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['otherTest'],
+          },
+        },
+      },
+      models: [],
+    };
+  });
+
+  it('should handle the deleteLayout action correctly', () => {
+    const expected = {
+      ...state,
+      layouts: {
+        test: { layouts: { edit: [], editRelations: [], list: ['test'] } },
+      },
+    };
+
+    expect(
+      mainReducer(fromJS(state), deleteLayout('otherTest')).toJS()
+    ).toEqual(expected);
+  });
+
+  it('should handle the deleteLayouts action correctly', () => {
+    const expected = { ...state, layouts: {} };
+    expect(mainReducer(fromJS(state), deleteLayouts()).toJS()).toEqual(
+      expected
+    );
+  });
+
+  it('should handle the resetListLabels action correctly', () => {
+    state.layouts.test.layouts.list.push('label');
+
+    const expected = {
+      ...state,
+      layouts: {
+        test: { layouts: { edit: [], editRelations: [], list: ['test'] } },
+        otherTest: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['otherTest'],
+          },
+        },
+      },
+    };
+
+    expect(mainReducer(fromJS(state), resetListLabels('test')).toJS()).toEqual(
+      expected
+    );
+  });
+
+  it('should handle the onChangeListLabels action correctly when adding a new label', () => {
+    const expected = {
+      ...state,
+      layouts: {
+        ...state.layouts,
+        otherTest: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['otherTest', 'foo'],
+          },
+        },
+      },
+    };
+
+    expect(
+      mainReducer(
+        fromJS(state),
+        onChangeListLabels({ target: { name: 'otherTest.foo', value: true } })
+      ).toJS()
+    ).toEqual(expected);
+  });
+
+  it('should handle the onChangeListLabels action correctly when removing a label', () => {
+    state.layouts.otherTest.layouts.list = ['otherTest', 'foo'];
+    const expected = {
+      ...state,
+      layouts: {
+        ...state.layouts,
+        otherTest: {
+          layouts: {
+            edit: [],
+            editRelations: [],
+            list: ['foo'],
+          },
+        },
+      },
+    };
+
+    expect(
+      mainReducer(
+        fromJS(state),
+        onChangeListLabels({
+          target: { name: 'otherTest.otherTest', value: false },
+        })
+      ).toJS()
+    ).toEqual(expected);
+  });
+});