Add specs for ObjectSpace::WeakKeyMap

[Feature #18498]

spec/ruby/core/objectspace/weakkeymap/element_reference_spec.rb

@@ -0,0 +1,24 @@
+require_relative '../../../spec_helper'
+
+describe "ObjectSpace::WeakKeyMap#[]" do
+  it "is faithful to the map's content" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2 = %w[a b].map(&:upcase)
+    ref1, ref2 = %w[x y]
+    map[key1] = ref1
+    map[key1].should == ref1
+    map[key1] = ref1
+    map[key1].should == ref1
+    map[key2] = ref2
+    map[key1].should == ref1
+    map[key2].should == ref2
+  end
+
+  it "matches using equality semantics" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2 = %w[a a].map(&:upcase)
+    ref = "x"
+    map[key1] = ref
+    map[key2].should == ref
+  end
+end

spec/ruby/core/objectspace/weakkeymap/element_set_spec.rb

@@ -0,0 +1,69 @@
+require_relative '../../../spec_helper'
+
+describe "ObjectSpace::WeakMap#[]=" do
+  def should_accept(map, key, value)
+    (map[key] = value).should == value
+    map.should.key?(key)
+    map[key].should == value
+  end
+
+  def should_not_accept(map, key, value)
+    -> { map[key] = value }.should raise_error(ArgumentError)
+  end
+
+  it "is correct" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2 = %w[a b].map(&:upcase)
+    ref1, ref2 = %w[x y]
+    should_accept(map, key1, ref1)
+    should_accept(map, key1, ref1)
+    should_accept(map, key2, ref2)
+    map[key1].should == ref1
+  end
+
+  it "requires the keys to implement #hash" do
+    map = ObjectSpace::WeakKeyMap.new
+    -> { map[BasicObject.new] = 1 }.should raise_error(NoMethodError, "undefined method `hash' for an instance of BasicObject")
+  end
+
+  it "accepts frozen keys or values" do
+    map = ObjectSpace::WeakKeyMap.new
+    x = Object.new
+    should_accept(map, x, true)
+    should_accept(map, x, false)
+    should_accept(map, x, 42)
+    should_accept(map, x, :foo)
+
+    y = Object.new.freeze
+    should_accept(map, x, y)
+    should_accept(map, y, x)
+  end
+
+  it "rejects symbols as keys" do
+    map = ObjectSpace::WeakKeyMap.new
+    should_not_accept(map, :foo, true)
+    should_not_accept(map, rand.to_s.to_sym, true)
+  end
+
+  it "rejects integers as keys" do
+    map = ObjectSpace::WeakKeyMap.new
+    should_not_accept(map, 42, true)
+    should_not_accept(map, 2 ** 68, true)
+  end
+
+  it "rejects floats as keys" do
+    map = ObjectSpace::WeakKeyMap.new
+    should_not_accept(map, 4.2, true)
+  end
+
+  it "rejects booleans as keys" do
+    map = ObjectSpace::WeakKeyMap.new
+    should_not_accept(map, true, true)
+    should_not_accept(map, false, true)
+  end
+
+  it "rejects nil as keys" do
+    map = ObjectSpace::WeakKeyMap.new
+    should_not_accept(map, nil, true)
+  end
+end

spec/ruby/core/objectspace/weakkeymap/getkey_spec.rb

@@ -0,0 +1,12 @@
+require_relative '../../../spec_helper'
+
+describe "ObjectSpace::WeakMap#getkey" do
+  it "returns the existing equal key" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2 = %w[a a].map(&:upcase)
+
+    map[key1] = true
+    map.getkey(key2).should equal(key1)
+    map.getkey("X").should == nil
+  end
+end

spec/ruby/core/objectspace/weakkeymap/inspect_spec.rb

@@ -0,0 +1,15 @@
+require_relative '../../../spec_helper'
+
+describe "ObjectSpace::WeakMap#inspect" do
+  it "only displays size in output" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2, key3 = "foo", "bar", "bar"
+    map.inspect.should =~ /\A\#<ObjectSpace::WeakKeyMap:0x\h+ size=0>\z/
+    map[key1] = 1
+    map.inspect.should =~ /\A\#<ObjectSpace::WeakKeyMap:0x\h+ size=1>\z/
+    map[key2] = 2
+    map.inspect.should =~ /\A\#<ObjectSpace::WeakKeyMap:0x\h+ size=2>\z/
+    map[key3] = 3
+    map.inspect.should =~ /\A\#<ObjectSpace::WeakKeyMap:0x\h+ size=2>\z/
+  end
+end

spec/ruby/core/objectspace/weakkeymap/key_spec.rb

@@ -0,0 +1,31 @@
+require_relative '../../../spec_helper'
+
+describe "ObjectSpace::WeakMap#key?" do
+  it "recognizes keys in use" do
+    map = ObjectSpace::WeakKeyMap.new
+    key1, key2 = %w[a b].map(&:upcase)
+    ref1, ref2 = %w[x y]
+
+    map[key1] = ref1
+    map.key?(key1).should == true
+    map[key1] = ref1
+    map.key?(key1).should == true
+    map[key2] = ref2
+    map.key?(key2).should == true
+  end
+
+  it "matches using equality semantics" do
+    map = ObjectSpace::WeakMap.new
+    key1, key2 = %w[a a].map(&:upcase)
+    ref = "x"
+    map[key1] = ref
+    map.key?(key2).should == false
+  end
+
+  it "reports true if the pair exists and the value is nil" do
+    map = ObjectSpace::WeakKeyMap.new
+    key = Object.new
+    map[key] = nil
+    map.key?(key).should == true
+  end
+end