Add tests

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 dist
+coverage

.travis.yml

@@ -0,0 +1,3 @@
+language: node_js
+node_js:
+  - "0.10"

package.json

@@ -4,7 +4,7 @@
   "description": "Utility for making React components easily themeable",
   "main": "dist/index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "babel-istanbul cover _mocha -- --compilers js:babel/register && babel-istanbul check-coverage --branches 100",
     "build": "babel src -d dist",
     "prepublish": "npm run build"
   },
@@ -22,6 +22,9 @@
     "object-assign": "^3.0.0"
   },
   "devDependencies": {
-    "babel": "^5.6.14"
+    "babel": "^5.6.14",
+    "babel-istanbul": "^0.2.10",
+    "chai": "^3.0.0",
+    "mocha": "^2.2.5"
   }
 }

test/index.js

@@ -0,0 +1,81 @@
+import themeable from '../src';
+import { expect } from 'chai';
+
+describe('className', () => {
+  const classes = { foo: 'aaa', bar: 'bbb' };
+  const classTheme = themeable(classes);
+
+  it('should return a single class', () => {
+    expect(classTheme(1, 'foo'))
+      .to.deep.equal({
+        key: 1,
+        className: classes.foo
+      });
+  });
+
+  it('should return multiple classes', () => {
+    expect(classTheme(2, 'foo', 'bar'))
+      .to.deep.equal({
+        key: 2,
+        className: `${classes.foo} ${classes.bar}`
+      });
+  });
+
+  it('should ignore falsy values', () => {
+    expect(classTheme(1, null, 'foo', undefined, false))
+      .to.deep.equal({
+        key: 1,
+        className: classes.foo
+      });
+  });
+
+});
+
+describe('style', () => {
+  const styles = {
+    foo: {
+      color: 'red',
+      fontSize: '16px'
+    },
+    bar: {
+      color: 'blue',
+      fontWeight: 'bold'
+    }
+  };
+  const styleTheme = themeable(styles);
+
+  it('should return a single style', () => {
+    expect(styleTheme(1, 'foo'))
+      .to.deep.equal({
+        key: 1,
+        style: {
+          color: 'red',
+          fontSize: '16px'
+        }
+      });
+  });
+
+  it('should return multiple styles merged', () => {
+    expect(styleTheme(1, 'foo', 'bar'))
+      .to.deep.equal({
+        key: 1,
+        style: {
+          fontSize: '16px',
+          color: 'blue',
+          fontWeight: 'bold'
+        }
+      });
+  });
+
+  it('should ignore falsy values', () => {
+    expect(styleTheme(1, false, undefined, 'foo', null))
+      .to.deep.equal({
+        key: 1,
+        style: {
+          color: 'red',
+          fontSize: '16px'
+        }
+      });
+  });
+
+});