added tests for power invert

TODO.md

@@ -10,14 +10,14 @@
 [ ] add release tag
 [ ] publish to npm
 
-## add tests for more nodes (44/47 done)
+## add tests for more nodes (45/47 done)
 [x] current
 [x] downstream_sense
 [x] fear
 [ ] force_down
 [ ] force_up
 [x] net
-[ ] power_invert
+[x] power_invert
 [x] pump
 [x] range_switch
 [x] reverse_up

test/42_power_invert.js

@@ -0,0 +1,61 @@
+describe("keyword: power invert", function(){
+
+ // This node is powered if and only if none of its children are powered. Can be
+ // destroyed by snowmelt.
+
+ it("is powered when one child is", function(){
+
+ var p = new HS.Program('power. invert powers two three');
+
+ p.tick();
+
+ expect(p.findFirstNode('power invert').isPowered()).toBe(false);
+ });
+
+ it("is not powered when multiple children are", function(){
+
+ var p = new HS.Program('power. invert powers powers powers');
+
+ p.tick();
+
+ expect(p.findFirstNode('power invert').isPowered()).toBe(false);
+ });
+
+ it("is powered when no children are", function(){
+
+ var p = new HS.Program('power. invert one two three');
+
+ p.tick();
+
+ expect(p.findFirstNode('power invert').isPowered()).toBe(true);
+ });
+
+ it("can be destroyed", function(){
+
+ var p = new HS.Program('power. invert snowmelt');
+
+ p.tick();
+ p.tick();
+
+ expect(p.findFirstNode('power invert').is_destroyed).toBe(true);
+ });
+
+ it("doesn't affect power once destroyed", function(){
+
+ var p = new HS.Program('power. invert snowmelt powers');
+
+ p.tick();
+
+ expect(p.findFirstNode('power invert').is_destroyed).toBe(false);
+ expect(p.findFirstNode('power invert').isPowered()).toBe(false);
+
+ p.tick();
+
+ expect(p.findFirstNode('power invert').is_destroyed).toBe(true);
+ expect(p.findFirstNode('power invert').isPowered()).toBe(true);
+ });
+
+
+
+});
+