diff --git a/Makefile b/Makefile
index 22d5b16..9f786e6 100644
--- a/Makefile
+++ b/Makefile
@@ -59,7 +59,7 @@ NAME :=			net-agent
 RELEASE_TARBALL :=	$(NAME)-$(STAMP).tgz
 RELEASE_MANIFEST :=	$(NAME)-$(STAMP).manifest
 RELSTAGEDIR :=		/tmp/$(NAME)-$(STAMP)
-NODEUNIT =		$(TOP)/node_modules/.bin/nodeunit
+TAPE =			$(TOP)/node_modules/.bin/tape
 
 #
 # Due to the unfortunate nature of npm, the Node Package Manager, there appears
@@ -78,14 +78,14 @@ RUN_NPM_INSTALL =	$(NPM_ENV) $(NPM) install
 all: $(SMF_MANIFESTS) | $(NPM_EXEC) $(REPO_DEPS)
 	$(RUN_NPM_INSTALL)
 
-$(NODEUNIT): | $(NPM_EXEC)
+$(TAPE): | $(NPM_EXEC)
 	$(RUN_NPM_INSTALL)
 
 CLEAN_FILES += $(TAP) ./node_modules/tap
 
 .PHONY: test
-test: $(TAP)
-	TAP=1 $(TAP) test/*.test.js
+test: $(TAPE)
+	$(NODE) $(TAPE) test/unit/*.test.js
 
 .PHONY: release
 release: all deps docs $(SMF_MANIFESTS)
diff --git a/lib/common.js b/lib/common.js
index b7dae15..fd3b9c9 100644
--- a/lib/common.js
+++ b/lib/common.js
@@ -34,7 +34,7 @@ function hasChanged(fields, cur, old) {
     }
 
     return fields.some(function (field) {
-        return mod_jsprim.deepEqual(cur[field], old[field]);
+        return !mod_jsprim.deepEqual(cur[field], old[field]);
     });
 }
 
diff --git a/package.json b/package.json
index 340cfd7..cd620e0 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
         "restify": "4.3.0",
         "sdc-bunyan-serializers": "git+https://github.com/joyent/sdc-bunyan-serializers.git#aefc119",
         "sdc-clients": "^10.5.0",
+        "tape": "4.5.1",
         "triton-mockcloud-common": "git+http://github.com/joyent/triton-mockcloud-common.git#master",
         "triton-netconfig": "1.1.0",
         "uuid": "3.2.1",
diff --git a/test/unit/util.test.js b/test/unit/util.test.js
new file mode 100644
index 0000000..5108cd6
--- /dev/null
+++ b/test/unit/util.test.js
@@ -0,0 +1,51 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * Copyright (c) 2019 Joyent, Inc.
+ */
+
+/*
+ * Tests that verify that NIC changes made in NAPI are reflected locally.
+ */
+
+'use strict';
+
+var mod_common = require('../../lib/common');
+var test = require('tape');
+
+// --- Tests
+
+test('hasChanged() tests', function (t) {
+    var OBJ1 = { a: 5, b: [ 1, 2, 3, 4 ] };
+    var OBJ2 = { a: 6, b: [ 1, 2, 3, 4 ] };
+    var OBJ3 = { a: 5, b: [ 1, 2, 3, 5 ] };
+
+    t.equal(mod_common.hasChanged([], OBJ1, null), true);
+    t.equal(mod_common.hasChanged([ 'a' ], OBJ1, OBJ2), true);
+    t.equal(mod_common.hasChanged([ 'b' ], OBJ1, OBJ3), true);
+
+    t.equal(mod_common.hasChanged([ 'a', 'b' ], OBJ1, OBJ3), true);
+    t.equal(mod_common.hasChanged([ 'a', 'b' ], OBJ1, OBJ2), true);
+    t.equal(mod_common.hasChanged([ 'a', 'b' ], OBJ2, OBJ3), true);
+
+    t.equal(mod_common.hasChanged([ 'a', 'b', 'c' ], OBJ1, OBJ3), true);
+    t.equal(mod_common.hasChanged([ 'a', 'b', 'c' ], OBJ1, OBJ2), true);
+    t.equal(mod_common.hasChanged([ 'a', 'b', 'c' ], OBJ2, OBJ3), true);
+
+    t.equal(mod_common.hasChanged([], {}, {}), false);
+    t.equal(mod_common.hasChanged([], OBJ1, OBJ2), false);
+    t.equal(mod_common.hasChanged([ 'a' ], OBJ1, OBJ3), false);
+    t.equal(mod_common.hasChanged([ 'b' ], OBJ1, OBJ2), false);
+    t.equal(mod_common.hasChanged([ 'c' ], OBJ1, OBJ2), false);
+
+    t.equal(mod_common.hasChanged([], OBJ1, OBJ1), false);
+    t.equal(mod_common.hasChanged([ 'a' ], OBJ1, OBJ1), false);
+    t.equal(mod_common.hasChanged([ 'b' ], OBJ1, OBJ1), false);
+    t.equal(mod_common.hasChanged([ 'c' ], OBJ1, OBJ1), false);
+
+    t.end();
+});