added unit tests for grid thresholds

src/test/specs/grafanaGraph-specs.js

@@ -73,6 +73,46 @@ define([
       });
     });
 
+    graphScenario('grid thresholds 100, 200', function(ctx) {
+      ctx.setup(function(scope) {
+        scope.panel.grid = {
+          threshold1: 100,
+          threshold1Color: "#111",
+          threshold2: 200,
+          threshold2Color: "#222",
+        };
+      });
+
+      it('should add grid markings', function() {
+        var markings = ctx.plotOptions.grid.markings;
+        expect(markings[0].yaxis.from).to.be(100);
+        expect(markings[0].yaxis.to).to.be(200);
+        expect(markings[0].color).to.be('#111');
+        expect(markings[1].yaxis.from).to.be(200);
+        expect(markings[1].yaxis.to).to.be(Infinity);
+      });
+    });
+
+    graphScenario('inverted grid thresholds 200, 100', function(ctx) {
+      ctx.setup(function(scope) {
+        scope.panel.grid = {
+          threshold1: 200,
+          threshold1Color: "#111",
+          threshold2: 100,
+          threshold2Color: "#222",
+        };
+      });
+
+      it('should add grid markings', function() {
+        var markings = ctx.plotOptions.grid.markings;
+        expect(markings[0].yaxis.from).to.be(200);
+        expect(markings[0].yaxis.to).to.be(100);
+        expect(markings[0].color).to.be('#111');
+        expect(markings[1].yaxis.from).to.be(100);
+        expect(markings[1].yaxis.to).to.be(-Infinity);
+      });
+    });
+
     graphScenario('series option overrides, fill & points', function(ctx) {
       ctx.setup(function(scope, data) {
         scope.panel.lines = true;