fixup! Add Predicate#to_hashes

Author: blambeau

spec/predicate/test_to_hashes.rb

@@ -0,0 +1,72 @@
+require 'spec_helper'
+class Predicate
+  describe Predicate, "to_hashes" do
+
+    let(:p){ Predicate }
+
+    subject{ predicate.to_hashes }
+
+    context "tautology" do
+      let(:predicate){ Predicate.tautology }
+
+      it{ expect(subject).to eql([{},{}]) }
+    end
+
+    context "contradiction" do
+      let(:predicate){ Predicate.contradiction }
+
+      it{ expect{ subject }.to raise_error(ArgumentError) }
+    end
+
+    context "eq" do
+      let(:predicate){ Predicate.eq(:x, 2) }
+
+      it{ expect(subject).to eql([{x: 2}, {}]) }
+    end
+
+    context "neq" do
+      let(:predicate){ Predicate.neq(:x, 2) }
+
+      it{ expect(subject).to eql([{},{x: 2}]) }
+    end
+
+    context "in" do
+      let(:predicate){ Predicate.in(:x, [2,3]) }
+
+      it{ expect(subject).to eql([{x: [2,3]},{}]) }
+    end
+
+    context "and" do
+      let(:predicate){ Predicate.eq(:x, 3) & Predicate.in(:y, [2,3]) }
+
+      it{ expect(subject).to eql([{x: 3, y: [2,3]},{}]) }
+    end
+
+    context "and with a neq" do
+      let(:predicate){ Predicate.neq(:x, 3) & Predicate.in(:y, [2,3]) }
+
+      it{ expect(subject).to eql([{y: [2,3]},{x: 3}]) }
+    end
+
+    context "not nil & eq" do
+      let(:predicate){ Predicate.neq(:x, nil) & Predicate.eq(:x, [2,3]) }
+
+      it{ expect(subject).to eql([{x: [2,3]},{x: nil}]) }
+    end
+
+    ## unsupported
+
+    context "not" do
+      let(:predicate){ Predicate.not(Predicate.eq(:x, 2)) }
+
+      it{ expect{ subject }.to raise_error(ArgumentError) }
+    end
+
+    context "not-and" do
+      let(:predicate){ Predicate.not(Predicate.eq(:x, 3) & Predicate.in(:y, [2,3])) }
+
+      it{ expect{ subject }.to raise_error(ArgumentError) }
+    end
+
+  end
+end