Initial work on Double

spec/spec_helper.cr

@@ -1,3 +1,5 @@
+require "json" # Needed to test masking Object#to_json in doubles.
+require "yaml" # Needed to test masking Object#to_yaml in doubles.
 require "../src/spectator"
 require "../src/spectator/should"
 require "./helpers/**"

spec/spectator/mocks/double_spec.cr

@@ -0,0 +1,114 @@
+require "../../spec_helper"
+
+Spectator.describe Spectator::Double do
+  subject(dbl) { Spectator::Double.new(foo: 42, bar: "baz") }
+
+  it "responds to defined messages" do
+    aggregate_failures do
+      expect(dbl.foo).to eq(42)
+      expect(dbl.bar).to eq("baz")
+    end
+  end
+
+  it "fails on undefined messages" do
+    expect { dbl.baz }.to raise_error(Spectator::UnexpectedMessage)
+  end
+
+  context "with common object methods" do
+    subject(dbl) do
+      Spectator::Double.new(
+        "!=": "!=",
+        "!~": "!~",
+        "==": "==",
+        "===": "===",
+        "=~": "=~",
+        "class": "class",
+        "dup": "dup",
+        "hash": "hash",
+        "in?": true,
+        "inspect": "inspect",
+        "itself": "itself",
+        "not_nil!": "not_nil!",
+        "pretty_inspect": "pretty_inspect",
+        "tap": "tap",
+        "to_json": "to_json",
+        "to_pretty_json": "to_pretty_json",
+        "to_s": "to_s",
+        "to_yaml": "to_yaml",
+        "try": "try",
+        "object_id": 42_u64,
+        "same?": false,
+      )
+    end
+
+    it "responds with defined messages" do
+      aggregate_failures do
+        expect(dbl.!=(42)).to eq("!=")
+        expect(dbl.!~(42)).to eq("!~")
+        expect(dbl.==(42)).to eq("==")
+        expect(dbl.===(42)).to eq("===")
+        expect(dbl.=~(42)).to eq("=~")
+        expect(dbl.class).to eq("class")
+        expect(dbl.dup).to eq("dup")
+        expect(dbl.hash(42)).to eq("hash")
+        expect(dbl.hash).to eq("hash")
+        expect(dbl.in?(42)).to eq(true)
+        expect(dbl.in?(1, 2, 3)).to eq(true)
+        expect(dbl.inspect).to eq("inspect")
+        expect(dbl.itself).to eq("itself")
+        expect(dbl.not_nil!).to eq("not_nil!")
+        expect(dbl.pretty_inspect).to eq("pretty_inspect")
+        expect(dbl.tap { nil }).to eq("tap")
+        expect(dbl.to_json).to eq("to_json")
+        expect(dbl.to_pretty_json).to eq("to_pretty_json")
+        expect(dbl.to_s).to eq("to_s")
+        expect(dbl.to_yaml).to eq("to_yaml")
+        expect(dbl.try { nil }).to eq("try")
+        expect(dbl.object_id).to eq(42_u64)
+        expect(dbl.same?(dbl)).to eq(false)
+        expect(dbl.same?(nil)).to eq(false)
+      end
+    end
+  end
+
+  context "without common object methods" do
+    subject(dbl) { Spectator::Double.new }
+
+    it "raises with undefined messages" do
+      io = IO::Memory.new
+      pp = PrettyPrint.new(io)
+      aggregate_failures do
+        expect { dbl.!=(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.!~(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.==(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.===(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.=~(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.class }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.dup }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.hash(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.hash }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.in?(42) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.in?(1, 2, 3) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.inspect }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.itself }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.not_nil! }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.pretty_inspect }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.pretty_inspect(io) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.pretty_print(pp) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.tap { nil } }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_json }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_json(io) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_pretty_json }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_pretty_json(io) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_s }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_s(io) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_yaml }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.to_yaml(io) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.try { nil } }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.object_id }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.same?(dbl) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+        expect { dbl.same?(nil) }.to raise_error(Spectator::UnexpectedMessage, /mask/)
+      end
+    end
+  end
+end