Add Package unit tests and unit test script

package.json

@@ -5,7 +5,8 @@
   "main": "index.js",
   "bin": "./bin/npm-sass",
   "scripts": {
-    "test": "NODE_PATH=$NODE_PATH:\"$(git rev-parse --show-toplevel)/test/fixtures/node_modules\" mocha test/index.js"
+    "test": "NODE_PATH=$NODE_PATH:\"$(git rev-parse --show-toplevel)/test/fixtures/node_modules\" mocha test/index.js",
+    "unit-test": "mocha test/units/*.js"
   },
   "repository": {
     "type": "git",
@@ -28,6 +29,7 @@
   "devDependencies": {
     "chai": "^3.5.0",
     "css": "^2.2.1",
-    "mocha": "^3.0.2"
+    "mocha": "^3.0.2",
+    "sinon": "^1.17.6"
   }
 }

test/units/package-test.js

@@ -0,0 +1,150 @@
+var Package = require('../../lib/resolver/package');
+var sinon = require('sinon');
+var assert = require('assert');
+
+describe('Package', function () {
+  var subject;
+
+  describe('#json', function () {
+    it('returns the package.json file for the package', function () {
+      var requireStub = sinon.stub();
+      var result;
+
+      requireStub.withArgs('test-package/package.json')
+        .returns('the package.json object');
+
+      subject = new Package('test-package', requireStub);
+
+      result = subject.json();
+
+      assert(requireStub.calledWith('test-package/package.json'));
+      assert.equal(result, 'the package.json object');
+    });
+  });
+
+  describe('#resolve', function () {
+    it('resolves a path that is local to the package', function () {
+      var requireMock = {
+        resolve: sinon.stub()
+      };
+
+      requireMock.resolve.withArgs('test-package/given-path').returns('npm resolved path');
+
+      var subject = new Package('test-package', requireMock);
+
+      var result = subject.resolve('given-path');
+
+      assert.equal(result, 'npm resolved path');
+      assert(requireMock.resolve.calledWith('test-package/given-path'));
+    });
+  });
+
+  describe('#safeResolve', function () {
+    it('resolves a path that is local to the package (but does not error out if it cannot find it)', function () {
+      var requireMock = {
+        resolve: sinon.stub()
+      };
+
+      requireMock.resolve.withArgs('test-package/package.json').returns('/a/b/c/test-package/package.json');
+
+      var subject = new Package('test-package', requireMock);
+
+      var result = subject.safeResolve('given-path');
+
+      assert.equal(result, '/a/b/c/test-package/given-path');
+    });
+  });
+
+  describe('#dir', function () {
+    it('returns the directory of the package', function () {
+      var requireMock = {
+        resolve: sinon.stub()
+      };
+
+      requireMock.resolve.withArgs('test-package/package.json').returns('/a/b/c/test-package/package.json');
+
+      var subject = new Package('test-package', requireMock);
+
+      var result = subject.dir();
+
+      assert.equal(result, '/a/b/c/test-package');
+    });
+  });
+
+  describe('#entrypoint', function () {
+    var requireStub
+
+    beforeEach(function () {
+      requireStub = sinon.stub();
+      requireStub.withArgs('test-package/package.json');
+    });
+
+    describe('sass', function () {
+      it('returns the entrypoint file', function () {
+        requireStub.returns({ sass: 'package-entrypoint' });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'package-entrypoint');
+      });
+    });
+
+    describe('style', function () {
+      it('returns the entrypoint file', function () {
+        requireStub.returns({ sass: null, style: 'package-entrypoint' });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'package-entrypoint');
+      });
+    });
+
+    describe('main', function () {
+      it('works with scss', function () {
+        requireStub.returns({ sass: null, style: null, main: 'index.scss' });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'index.scss');
+      });
+
+      it('works with css', function () {
+        requireStub.returns({ sass: null, style: null, main: 'index.css' });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'index.css');
+      });
+
+      it('works with sass', function () {
+        requireStub.returns({ sass: null, style: null, main: 'index.sass' });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'index.sass');
+      });
+    });
+
+    describe('not specified', function () {
+      it('falls back to styles', function () {
+        requireStub.returns({ sass: null, style: null, main: null });
+
+        var subject = new Package('test-package', requireStub);
+
+        var result = subject.entrypoint();
+
+        assert.equal(result, 'styles');
+      });
+    });
+  });
+});