diff --git a/test/defaults.js b/test/defaults.js
new file mode 100644
index 0000000..9dab032
--- /dev/null
+++ b/test/defaults.js
@@ -0,0 +1,47 @@
+const { expect } = require('chai');
+const path = require('path');
+const { render, renderSync } = require('../src');
+const { normalizePath } = require('../src/util');
+const { types } = require('node-sass');
+
+const defaultsFile = path.join(__dirname, 'sass', 'defaults.scss');
+
+function verifyDefaults(rendered, sourceFile) {
+  expect(rendered.vars).to.exist;
+  expect(rendered.vars).to.have.property('global');
+  expect(rendered.vars.global).to.have.property('$variable');
+
+  expect(rendered.vars.global.$variable.type).to.equal('SassNumber');
+  expect(rendered.vars.global.$variable.sources).to.have.length(1);
+  expect(rendered.vars.global.$variable.sources[0]).to.equal(normalizePath(sourceFile));
+  expect(rendered.vars.global.$variable.declarations).to.have.length(4);
+  expect(rendered.vars.global.$variable.declarations[0].expression).to.equal(`123px`);
+  expect(rendered.vars.global.$variable.declarations[0].flags).to.deep.equal({ global: false, default: false });
+  expect(rendered.vars.global.$variable.declarations[1].expression).to.equal(`456px !default`);
+  expect(rendered.vars.global.$variable.declarations[1].flags).to.deep.equal({ global: false, default: true });
+  expect(rendered.vars.global.$variable.declarations[2].expression).to.equal(`789px`);
+  expect(rendered.vars.global.$variable.declarations[2].flags).to.deep.equal({ global: false, default: false });
+  expect(rendered.vars.global.$variable.declarations[3].expression).to.equal(`100px !default`);
+  expect(rendered.vars.global.$variable.declarations[3].flags).to.deep.equal({ global: false, default: true });
+
+  expect(rendered.vars.global.$variable.value).to.equal(789);
+  expect(rendered.vars.global.$variable.unit).to.equal('px');
+}
+
+describe('defaults', () => {
+  describe('sync', () => {
+    it('should extract all variables', () => {
+      const rendered = renderSync({ file: defaultsFile });
+      verifyDefaults(rendered, defaultsFile);
+    });
+  });
+
+  describe('async', () => {
+    it('should extract all variables', () => {
+      return render({ file: defaultsFile })
+      .then(rendered => {
+        verifyDefaults(rendered, defaultsFile);
+      });
+    });
+  });
+});
diff --git a/test/sass/defaults.scss b/test/sass/defaults.scss
new file mode 100644
index 0000000..813c43d
--- /dev/null
+++ b/test/sass/defaults.scss
@@ -0,0 +1,4 @@
+$variable: 123px;
+$variable: 456px !default;
+$variable: 789px;
+$variable: 100px !default;
\ No newline at end of file