Alter the plugin to use stricter "to satisfy" semantics.

documentation/assertions/Set/to-have-items-satisfying.md

@@ -0,0 +1,55 @@
+Asserts the items contained by a Set satisfy a particular list of items.
+
+```js
+expect(new Set([1, 2, 3]), 'to have items satisfying', [1, { foo: 'bar' }, 3]);
+```
+
+```output
+expected Set([ 1, 2, 3 ]) to have items satisfying [ 1, { foo: 'bar' }, 3 ]
+
+Set([
+  1, // should equal [ 1, { foo: 'bar' }, 3 ]
+  2, // should equal [ 1, { foo: 'bar' }, 3 ]
+  3 // should equal [ 1, { foo: 'bar' }, 3 ]
+])
+```
+
+In order to check a property holds for all the items, an assertion can be
+passed as the argument – in this example we assert that all the items in
+the set are numbers:
+
+```js
+expect(new Set([1, 2, []]), 'to have items satisfying', 'to be a number');
+```
+
+```output
+expected Set([ 1, 2, [] ]) to have items satisfying to be a number
+
+Set([
+  1,
+  2,
+  [] // should be a number
+])
+```
+
+The exact number of elements in a Set must always be matched. However, nested
+objects are, be default, compared using "satisfy" semantics which allow missing
+properties. In order to enforce that all properties are present, the `exhaustively`
+flag can be used:
+
+```js
+expect(new Set([[{ foo: true, bar: true }], [1]]), 'to have items satisfying', [
+  expect.it('to be an object'),
+]);
+```
+
+```output
+expected Set to have items satisfying [ expect.it('to be an object') ]
+
+Set([
+  [ { foo: true, bar: true } ],
+  [
+    1 // should be an object
+  ]
+])
+```

documentation/assertions/Set/to-satisfy.md

@@ -2,41 +2,53 @@ Asserts that a Set instance has at least one element satisfying each given
 spec.
 
 ```js
-expect(new Set([1, 2, 3]), 'to satisfy', [
-  1,
-  expect.it('to be less than or equal to', 1),
-  expect.it('to be greater than', 10),
-]);
+expect(
+  new Set([1, 2, 3]),
+  'to satisfy',
+  new Set([
+    1,
+    expect.it('to be less than or equal to', 1),
+    expect.it('to be greater than', 10),
+  ])
+);
 ```
 
 ```output
 expected Set([ 1, 2, 3 ]) to satisfy
-[
+Set([
   1,
   expect.it('to be less than or equal to', 1),
   expect.it('to be greater than', 10)
-]
+])
 
 Set([
   1,
-  2,
-  3
+  2, // should be removed
+  3 // should be removed
   // missing: should be greater than 10
 ])
 ```
 
-If the subject should not contain additional elements, use the `exhaustively`
-flag:
+The exact number of elements in a Set must always be matched. However, nested
+objects are, be default, compared using "satisfy" semantics which allow missing
+properties. In order to enforce that all properties are present, the `exhaustively`
+flag can be used:
 
 ```js
-expect(new Set([1, 2]), 'to exhaustively satisfy', [2]);
+expect(
+  new Set([1, { foo: true, bar: false }]),
+  'to exhaustively satisfy',
+  new Set([1, { foo: true }])
+);
 ```
 
 ```output
-expected Set([ 1, 2 ]) to exhaustively satisfy [ 2 ]
+expected Set([ 1, { foo: true, bar: false } ])
+to exhaustively satisfy Set([ 1, { foo: true } ])
 
 Set([
-  1, // should be removed
-  2
+  1,
+  { foo: true, bar: false } // should be removed
+  // missing { foo: true }
 ])
 ```

documentation/assertions/array-like/with-set-semantics.md

@@ -6,19 +6,19 @@ accessible when you need to make assertions about an array without considering
 the order or duplicate items.
 
 ```js
-expect([3, 2, 1], 'with set semantics to satisfy', [1]);
+expect([3, 2, 1], 'with set semantics to satisfy', new Set([1, 2, 3]));
 ```
 
 ```js
-expect([3, 2, 1], 'with set semantics to exhaustively satisfy', [1]);
+expect([3, 2, 1], 'with set semantics to satisfy', new Set([1, 2]));
 ```
 
 ```output
-expected [ 3, 2, 1 ] with set semantics to exhaustively satisfy [ 1 ]
+expected [ 3, 2, 1 ] with set semantics to satisfy Set([ 1, 2 ])
 
 Set([
   3, // should be removed
-  2, // should be removed
+  2,
   1
 ])
 ```

documentation/index.md

@@ -13,11 +13,11 @@ Add support to [Unexpected](http://unexpected.js.org) for testing [Set](https://
 [![Dependency Status](https://david-dm.org/unexpectedjs/unexpected-set.svg)](https://david-dm.org/unexpectedjs/unexpected-set)
 
 ```js
-expect(new Set([1, 2, 3]), 'to satisfy', [3, 4]);
+expect(new Set([1, 2, 3]), 'to satisfy', new Set([1, 2, 3, 4]));
 ```
 
 ```output
-expected Set([ 1, 2, 3 ]) to satisfy [ 3, 4 ]
+expected Set([ 1, 2, 3 ]) to satisfy Set([ 1, 2, 3, 4 ])
 
 Set([
   1,

lib/unexpected-set.js

@@ -228,14 +228,18 @@ module.exports = {
       }
     );
 
+    expect.addAssertion('<Set> [not] to be empty', (expect, subject) => {
+      expect(subject.size, '[not] to equal', 0);
+    });
+
     expect.addAssertion(
       [
-        '<Set> to have items [exhaustively] satisfying <any+>',
+        '<Set> to have items [exhaustively] satisfying <any>',
         '<Set> to have items [exhaustively] satisfying <assertion>',
       ],
       (expect, subject, nextArg) => {
         expect.errorMode = 'nested';
-        expect(subject.size, 'not to equal', 0);
+        expect(subject, 'not to be empty');
         expect.errorMode = 'bubble';
 
         const subjectElements = [];
@@ -244,15 +248,14 @@ module.exports = {
         });
 
         const expected = [];
-        subject.forEach((subjectElement) => {
+        subjectElements.forEach((subjectElement) => {
           if (typeof nextArg === 'string') {
             expected.push(expect.it((s) => expect.shift(s, 0)));
-          } else if (typeof nextArg === 'function') {
-            expected.push(nextArg);
           } else {
             expected.push(nextArg);
           }
         });
+
         return expect.withError(
           () => expect(subjectElements, 'to [exhaustively] satisfy', expected),
           (err) => {
@@ -279,21 +282,15 @@ module.exports = {
     expect.addAssertion(
       '<Set> to [exhaustively] satisfy <Set>',
       (expect, subject, value) => {
+        const subjectElements = [];
+        subject.forEach((element) => {
+          subjectElements.push(element);
+        });
         const valueElements = [];
         value.forEach((element) => {
           valueElements.push(element);
         });
-        return expect(subject, 'to [exhaustively] satisfy', valueElements);
-      }
-    );
 
-    expect.addAssertion(
-      '<Set> to [exhaustively] satisfy <array-like>',
-      (expect, subject, valueElements) => {
-        const subjectElements = [];
-        subject.forEach((element) => {
-          subjectElements.push(element);
-        });
         const promiseBySubjectIndexAndValueIndex = subjectElements.map(
           () => new Array(valueElements.length)
         );
@@ -327,12 +324,11 @@ module.exports = {
               !promiseByValueIndexAndSubjectIndex.every((row) =>
                 row.some((promise) => promise.isFulfilled())
               ) ||
-              (expect.flags.exhaustively &&
-                !subjectElements.every((subjectElement, i) =>
-                  promiseByValueIndexAndSubjectIndex.some((row) =>
-                    row[i].isFulfilled()
-                  )
-                ))
+              !subjectElements.every((subjectElement, i) =>
+                promiseByValueIndexAndSubjectIndex.some((row) =>
+                  row[i].isFulfilled()
+                )
+              )
             ) {
               expect.fail({
                 diff(output, diff, inspect, equal) {
@@ -367,7 +363,6 @@ module.exports = {
                           subjectElements.length
                         );
                         if (
-                          expect.flags.exhaustively &&
                           !promiseBySubjectIndexAndValueIndex[
                             subjectIndex
                           ].some((promise, valueIndex) =>