spec/instructions/instruction_class_spec.rb in nudge-0.0.2 vs spec/instructions/instruction_class_spec.rb in nudge-0.1.0

@@ -1,9 +1,40 @@
 require File.join(File.dirname(__FILE__), "/../spec_helper")
 include Nudge
 
+
+class TestingInterdependencyInstruction < Instruction
+  def preconditions?
+    needs IntAddInstruction
+  end
+end
+
 describe "Instruction has a master list" do
   it "should have an #all_instructions [getter] method to return a list of every defined instruction" do
     # will be a list of every type subclassed from Instruction
     Instruction.all_instructions.should include(IntAddInstruction)
   end
+end
+
+describe "capturing errors" do
+  describe "NotEnoughStackItems" do
+    describe "#preconditions?" do
+      it "should push an :error ValuePoint onto the :error stacks when NotEnoughStackItems is raised" do
+        context = Interpreter.new
+        i1 = IntAddInstruction.new(context)
+        lambda{i1.go}.should_not raise_error
+        context.stacks[:error].peek.blueprint.should include "int too small"
+      end
+    end
+  end
+  
+  describe "MissingInstructionError" do
+    it "should push an error if missing interdependent Instruction is identified" do
+      context = Interpreter.new
+      context.disable(IntAddInstruction)
+      i1 = TestingInterdependencyInstruction.new(context)
+      lambda{i1.go}.should_not raise_error
+      context.stacks[:error].peek.blueprint.should include "needs IntAddInstruction"
+    end
+  end
+  
 end
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