flow like the river

VISUALIZACION/node_modules/ngraph.merge/test/merge.js

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+var test = require('tap').test,
+  merge = require('..');
+
+test('Should not touch properties when types match', function(t) {
+  var options = {
+    age: 42
+  };
+  merge(options, {
+    age: 24
+  });
+
+  t.equals(options.age, 42);
+  t.end();
+});
+
+test('Should extend, because types are different', function(t) {
+  var options = {
+    age: '42'
+  };
+  merge(options, {
+    age: 24
+  });
+
+  t.equals(options.age, 24);
+  t.end();
+});
+
+test('Should augment with new properties', function(t) {
+  var options = {
+    age: 42
+  };
+  merge(options, {
+    newproperty: 24
+  });
+
+  t.equals(options.age, 42);
+  t.equals(options.newproperty, 24);
+  t.end();
+});
+
+test('goes deep', function(t) {
+  var options = {
+    age: 42
+  };
+  merge(options, {
+    nested: {
+      name: 'deep'
+    }
+  });
+
+  t.equals(options.age, 42);
+  t.equals(options.nested.name, 'deep');
+  t.end();
+});
+
+test('goes deep avoids conflicts', function(t) {
+  var options = {
+    age: 42,
+    user: {
+      firstName: 'John'
+    }
+  };
+  merge(options, {
+    user: {
+      lastName: 'Smith'
+    }
+  });
+
+  t.equals(options.age, 42);
+  t.equals(options.user.firstName, 'John');
+  t.equals(options.user.lastName, 'Smith');
+  t.end();
+});
+
+test('Initializes with default object', function(t) {
+  var options = {
+    age: '42'
+  };
+  var result = merge(undefined, options);
+  t.deepEqual(result, options);
+
+  var onlyOptions = merge(options);
+  t.deepEqual(onlyOptions, options);
+
+  t.end();
+});
+
+test('Do not copy prototype', function(t) {
+  function Options() {
+    this.age = 42;
+  }
+  Options.prototype.foo = 'foo';
+
+  var options = new Options();
+  var result = merge({}, options);
+  t.equals(result.age, 42);
+  t.ok(result.foo === undefined);
+
+  t.end();
+});