Adding inDirKeep method in run-context. (#20)

* Adding run-context method inDirKeep and index testDirectoryKeep.

* Adding tests for #inDirKeep() in test/run-context.js

* Delete comment.

* Removing testDirectoryKeep method.

* Removing testDirectoryKeep call from inDirKeep...

and assert for directory existance.

* Remove test for calling testingDirKeep

* Remove dir testing.

* Removing trailing spaces

* Rename inDirKeep -> cd, remove cb and add tests in run-context.

Author: Uroš Jarc

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 coverage
+.idea

lib/run-context.js

@@ -146,6 +146,18 @@ RunContext.prototype.inDir = function (dirPath, cb) {
   return this;
 };
 
+/**
+ * Change directory into provided directory.
+ * @param  {String} dirPath - Directory path (relative to CWD). Prefer passing an absolute
+ *                            file path for predictable results
+ * @return {this} run context instance
+ */
+RunContext.prototype.cd = function (dirPath) {
+  this.inDirSet = true;
+  this.targetDirectory = dirPath;
+  return this;
+};
+
 /**
  * Cleanup a temporary directy and change the CWD into it
  *

test/run-context.js

@@ -274,6 +274,33 @@ describe('RunContext', function () {
     });
   });
 
+  describe('#cd()', function () {
+    beforeEach(function () {
+      process.chdir(__dirname);
+      this.tmp = tmpdir;
+    });
+
+    it('do not call helpers.testDirectory()', function () {
+      sinon.spy(helpers, 'testDirectory');
+      this.ctx.cd(this.tmp);
+      assert(!helpers.testDirectory.calledOnce);
+      helpers.testDirectory.restore();
+    });
+
+    it('is chainable', function () {
+      assert.equal(this.ctx.cd(this.tmp), this.ctx);
+    });
+
+    it('should set inDirSet & targetDirectory', function () {
+      assert(!this.ctx.inDirSet);
+      assert(!this.ctx.targetDirectory);
+      this.ctx.cd(this.tmp);
+      assert.equal(this.ctx.inDirSet, true);
+      assert.equal(this.ctx.targetDirectory, this.tmp);
+    });
+
+  });
+
   describe('#inTmpDir', function () {
     it('call helpers.testDirectory()', function () {
       sinon.spy(helpers, 'testDirectory');