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build/node_modules/merge-defaults/test/compatibility.test.js

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+var _ = require('lodash');
+var should = require('should');
+_.defaultsDeep = require('../');
+
+
+
+/**
+ * Purpose:
+ * This test exists to make sure I didn't break anything when
+ * using mergeDefaults to override `_.defaults`.
+ */
+
+// From Lodash core tests:
+// https://github.com/lodash/lodash/blob/master/test/test.js#L1843
+describe('Test that _.mergeDefaults is backwards compatible with _.defaults \n', function() {
+  it('should assign properties of a source object if missing on the destination object', function() {
+    deepEqual(_.defaultsDeep({
+      'a': 1
+    }, {
+      'a': 2,
+      'b': 2
+    }), {
+      'a': 1,
+      'b': 2
+    });
+  });
+
+  it('should assign own source properties', function() {
+    function Foo() {
+      this.a = 1;
+      this.c = 3;
+    }
+
+    Foo.prototype.b = 2;
+    deepEqual(_.defaultsDeep({
+      'c': 2
+    }, new Foo()), {
+      'a': 1,
+      'c': 2
+    });
+  });
+
+  it('should accept multiple source objects', function() {
+    var expected = {
+      'a': 1,
+      'b': 2,
+      'c': 3
+    };
+    deepEqual(_.defaultsDeep({
+      'a': 1,
+      'b': 2
+    }, {
+      'b': 3
+    }, {
+      'c': 3
+    }), expected);
+    deepEqual(_.defaultsDeep({
+      'a': 1,
+      'b': 2
+    }, {
+      'b': 3,
+      'c': 3
+    }, {
+      'c': 2
+    }), expected);
+  });
+
+  it('should not overwrite `null` values', function() {
+    var actual = _.defaultsDeep({
+      'a': null
+    }, {
+      'a': 1
+    });
+    strictEqual(actual.a, null);
+  });
+
+  it('should overwrite `undefined` values', function() {
+    var actual = _.defaultsDeep({
+      'a': undefined
+    }, {
+      'a': 1
+    });
+    strictEqual(actual.a, 1);
+  });
+
+  it('should not error on `null` or `undefined` sources (test in IE < 9)', function() {
+    try {
+      deepEqual(_.defaultsDeep({
+        'a': 1
+      }, null, undefined, {
+        'a': 2,
+        'b': 2
+      }), {
+        'a': 1,
+        'b': 2
+      });
+    } catch (e) {
+      throw e;
+    }
+  });
+});
+
+
+// helper methods
+function strictEqual(x, y) {
+  return should(x).equal(y);
+}
+
+function deepEqual(x, y) {
+  return should(x).eql(y);
+}