📝 teardown command

src/TearDownCommand.js

@@ -1,9 +1,26 @@
 class TearDownCommand {
-    constructor() {
-
+    constructor(pathToJsonFile, driverLocator, fs) {
+        this.pathToJsonFile = pathToJsonFile;
+        this.driverLocator = driverLocator;
+        this.fs = fs;
     }
 
     run() {
+        let seededData = this.fs.readFileSync(this.pathToJsonFile);
+
+        seededData.reverse();
+
+        let drivers = this.driverLocator.drivers();
+
+        seededData.forEach((row) => {
+            let type = row["type"];
+            if(type in drivers){
+                let driver = drivers[type];
+                driver.tearDown();
+            }else{
+                throw Error("Seeded data file does not contain a type that you have a driver for");
+            }
+        });
 
     }
 }

test/TearDownCommandTest.js

@@ -11,6 +11,40 @@ let expect = chai.expect;
 let TearDownCommand = require('../src/TearDownCommand').TearDownCommand;
 
 describe('Tear down command tests', () => {
+    it("should throw an error when a seeded data json file doesn't exist", () =>{
+        let drivers = {};
+
+        let driverLocator = {
+            drivers: function () {
+                return drivers;
+            }
+        };
+
+        let fsMock = {
+            readFileSync: function(){
+                return [
+                    {
+                        "type": "herpderp",
+                        "properties": {
+                            "name": "Bob Dole"
+                        }
+                    }
+                ];
+            }
+        };
+
+        let tearDownCommand = new TearDownCommand(
+            './path/to/seed.json',
+            driverLocator,
+            fsMock
+        );
+
+        expect(tearDownCommand.run.bind(tearDownCommand)).to.throw(
+            "Seeded data file does not contain a type that you have a driver for"
+        );
+
+    });
+
     it('should destroy all the objects in the dependency chain',() => {
 
         let accountDriverSpy = chai.spy.object(['tearDown']);
@@ -27,17 +61,36 @@ describe('Tear down command tests', () => {
             }
         };
 
-        let fs = {};
+        let fsMock = {
+            readFileSync: function(){
+                return [
+                    {
+                        "type": "contact",
+                        "properties": {
+                            "name": "Bob Dole"
+                        }
+                    },
+                    {
+                        "type": "account",
+                        "properties": {
+                            "items": [
+                                "Pizza"
+                            ]
+                        }
+                    }
+                ];
+            }
+        };
 
         let tearDownCommand = new TearDownCommand(
             './path/to/seed.json',
             driverLocator,
-            fs
+            fsMock
         );
 
         tearDownCommand.run();
 
-        accountDriverSpy.should.have.been.called.once;
-        contactDriverSpy.should.have.been.called.once;
+        accountDriverSpy.tearDown.should.have.been.called.once;
+        contactDriverSpy.tearDown.should.have.been.called.once;
     });
 });