chore(tests): fix typo "merge" to "merges" in reducer test file (#948)…

… - @yukimurasawa

Co-authored-by: yukimurasawa <[email protected]>

test/unit/reducer.spec.js

@@ -219,15 +219,15 @@ describe('reducer', () => {
       expect(firebaseReducer({}, action)).to.deep.equal(initialState)
     })
 
-    it('merge data to empty state under path', () => {
+    it('merges data to empty state under path', () => {
       action = { type: actionTypes.MERGE, path, data: exampleData }
       expect(firebaseReducer({}, action).data).to.deep.equal({
         ...initialState.data,
         [path]: exampleData
       })
     })
 
-    it('merge data to empty state under paths that end in a number', () => {
+    it('merges data to empty state under paths that end in a number', () => {
       action = { type: actionTypes.MERGE, path: 'test/123', data: exampleData }
       expect(firebaseReducer({}, action).data).to.deep.equal({
         ...initialState.data,
@@ -273,15 +273,15 @@ describe('reducer', () => {
       })
     })
 
-    it('merge data to path with already existing value of null', () => {
+    it('merges data to path with already existing value of null', () => {
       initialData = { data: { test: { [childKey]: null } } }
       action = { type: actionTypes.MERGE, path: childPath, data: newData }
       expect(firebaseReducer(initialData, action).data).to.deep.equal(
         setWith(Object, childDotPath, newData, {})
       )
     })
 
-    it('merge data to path with already existing parent of null', () => {
+    it('merges data to path with already existing parent of null', () => {
       initialData = { data: { test: null } }
       action = { type: actionTypes.MERGE, path: childPath, data: exampleData }
       expect(firebaseReducer(initialData, action).data).to.deep.equal(