Update specs.

spec/heaphash_spec.cr

@@ -0,0 +1,65 @@
+require "./spec_helper"
+
+describe HeapHash do
+  describe "#[]" do
+    hh = HeapHash(String, Int32).new
+
+    it "correctly assigns new keys" do
+      hh["a"] = 5
+      hh["b"] = 3
+      hh["c"] = 10
+      hh["a"].should eq(5)
+      hh["b"].should eq(3)
+      hh["c"].should eq(10)
+      hh.size.should eq(3)
+    end
+
+    it "correctly updates the value of a key" do
+      hh["a"] = 0
+      hh["a"].should eq(0)
+      hh.size.should eq(3)
+    end
+
+    it "returns nil for non-existent keys" do
+      hh["?"]?.should be_nil
+    end
+
+    it "throws for non-existent keys" do
+      expect_raises(KeyError) do
+        hh["?"]
+      end
+    end
+  end
+
+  describe "#pop" do
+    it "pops keys in the right oder" do
+      hh = HeapHash(String, Int32).new
+      expect_raises(IndexError) do
+        hh.pop
+      end
+
+      hh["last"] = 1
+      hh["first"] = 10
+      hh["medium"] = 5
+
+      hh.pop.should eq({"first", 10})
+      hh.pop.should eq({"medium", 5})
+      hh.pop.should eq({"last", 1})
+    end
+  end
+
+  describe "#delete" do
+    it "doesn't break the heap property" do
+      hh = HeapHash(String, Int32).new
+
+      hh["last"] = 1
+      hh["first"] = 10
+      hh["medium"] = 5
+      
+      popped = hh.delete "last"
+      popped.should eq({"last", 1})
+      hh.pop.should eq({"first", 10})
+      hh.pop.should eq({"medium", 5})
+    end
+  end
+end