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vendors/Chart.js/test/core.plugin.tests.js

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+// Plugin tests
+describe('Test the plugin system', function() {
+	beforeEach(function() {
+		Chart.plugins = [];
+	});
+
+	it ('Should register plugins', function() {
+		var myplugin = {};
+		Chart.pluginService.register(myplugin);
+		expect(Chart.plugins.length).toBe(1);
+
+		// Should only add plugin once
+		Chart.pluginService.register(myplugin);
+		expect(Chart.plugins.length).toBe(1);		
+	});
+
+	it ('Should allow unregistering plugins', function() {
+		var myplugin = {};
+		Chart.pluginService.register(myplugin);
+		expect(Chart.plugins.length).toBe(1);
+
+		// Should only add plugin once
+		Chart.pluginService.remove(myplugin);
+		expect(Chart.plugins.length).toBe(0);		
+
+		// Removing a plugin that doesn't exist should not error
+		Chart.pluginService.remove(myplugin);
+	});
+
+	it ('Should allow notifying plugins', function() {
+		var myplugin = {
+			count: 0,
+			trigger: function(chart) {
+				myplugin.count = chart.count;
+			}
+		};
+		Chart.pluginService.register(myplugin);
+		
+		Chart.pluginService.notifyPlugins('trigger', [{ count: 10 }]);
+
+		expect(myplugin.count).toBe(10);
+	});
+});