Test operation identification functions

tests/unit/patch/createOperation.ts

@@ -1,6 +1,9 @@
 import * as registerSuite from 'intern!object';
 import * as assert from 'intern/chai!assert';
-import  createOperation, { OperationType } from '../../../src/patch/createOperation';
+import  createOperation, {
+	OperationType, isMove, isCopy, isReplace, isRemove,
+	isAdd, isTest
+} from '../../../src/patch/createOperation';
 
 registerSuite({
 	name: 'Operation',
@@ -142,5 +145,20 @@ registerSuite({
 
 		const operation = createOperation(OperationType.Copy, ['prop1'], null, ['prop2']);
 		assert.strictEqual(operation.toString(), '{"op":"copy","path":"prop1","from":"prop2"}');
+	},
+	'Should identify operation type'(this: any) {
+		const move = createOperation(OperationType.Move, ['prop2'], null, ['prop1']);
+		const copy = createOperation(OperationType.Copy, ['prop2'], null, ['prop1']);
+		const replace = createOperation(OperationType.Replace, ['prop1'], 2);
+		const remove = createOperation(OperationType.Remove, ['prop1']);
+		const add = createOperation(OperationType.Add, ['prop1'], 1);
+		const test = createOperation(OperationType.Test, ['prop1'], 2);
+
+		assert.isTrue(isMove(move), 'Didn\'t properly identify move operation');
+		assert.isTrue(isCopy(copy), 'Didn\'t properly identify copy operation');
+		assert.isTrue(isReplace(replace), 'Didn\'t properly identify replace operation');
+		assert.isTrue(isRemove(remove), 'Didn\'t properly identify remove operation');
+		assert.isTrue(isAdd(add), 'Didn\'t properly identify add operation');
+		assert.isTrue(isTest(test), 'Didn\'t properly identify test operation');
 	}
 });