From 4d5dabdf67406dc6e93effc30d6606f8e4946a30 Mon Sep 17 00:00:00 2001
From: Sergej Shafarenka <beworker@gmail.com>
Date: Sun, 27 Aug 2017 10:37:54 +0200
Subject: [PATCH 1/2] Adding compare function to be used in expected object
 template

---
 lib/chai-subset.js            |  3 +++
 test/unit/chai-subset.spec.js | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/lib/chai-subset.js b/lib/chai-subset.js
index d2dce91..4ca3ba0 100644
--- a/lib/chai-subset.js
+++ b/lib/chai-subset.js
@@ -71,6 +71,9 @@
 				if (typeof(eo) === 'object' && eo !== null && ao !== null) {
 					return compare(eo, ao);
 				}
+				if (typeof(eo) === 'function') {
+					return eo(ao);
+				}
 				return ao === eo;
 			});
 		}
diff --git a/test/unit/chai-subset.spec.js b/test/unit/chai-subset.spec.js
index 3fc4e28..042067d 100644
--- a/test/unit/chai-subset.spec.js
+++ b/test/unit/chai-subset.spec.js
@@ -126,6 +126,20 @@ describe('circular objects', function() {
 	});
 });
 
+describe('object with compare function', function() {
+	it('should pass when function returns true', function () {
+		expect({a: 5}).to.containSubset({a: a => a});
+	});
+
+	it('should fail when function returns false', function () {
+		expect({a: 5}).to.not.containSubset({a: a => !a});
+	});
+
+	it('should pass for function with no arguments', function () {
+		expect({a: 5}).to.containSubset({a: () => true});
+	});
+});
+
 describe('comparison of non objects', function () {
 	it('should fail if actual subset is null', function () {
 		expect(null).to.not.containSubset({a: 1});

From cf6b56d423d8841717e399bf94701b26e73aa504 Mon Sep 17 00:00:00 2001
From: Sergej Shafarenka <beworker@gmail.com>
Date: Thu, 31 Aug 2017 18:24:51 +0200
Subject: [PATCH 2/2] Adding compare function example to README.md

---
 README.md | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 80ad1b1..2e50904 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,14 @@ expect(obj).to.containSubset({
 		}
 	}
 });
-//or with 'not'
+
+// or using a compare function
+expect(obj).containSubset({
+	a: (expectedValue) => expectedValue,
+	c: (expectedValue) => expectedValue === 'd'
+})
+
+// or with 'not'
 expect(obj).to.not.containSubset({
 	g: 'whatever'
 });