Add rspec matchers for Maybe and (Strict)?Equals

`expect(a).to eq_just b` <=> `a.IsJust && a.FromJust == b`
`expect(a).to be_successful` <=> `a.IsJust && a.FromJust`
`expect(a).to strict_eq b` <=> if a is Maybe: `a.IsJust && a.FromJust.StrictEquals(b)`; else `a.StrictEquals(b)`
`expect(a).to v8_eq b` <=> same as above but for `Equals` instead of `StrictEquals`

spec/c/array_spec.rb

@@ -12,7 +12,7 @@ describe V8::C::Array do
     a.Set(@ctx, 0, o)
     expect(a.Length).to eq 1
 
-    expect(a.Get(@ctx, 0).FromJust().Equals(o)).to eq true
+    expect(a.Get(@ctx, 0)).to v8_eq o
   end
 
   it 'can be initialized with a length' do

spec/c/function_spec.rb

@@ -24,8 +24,8 @@ describe V8::C::Function do
 
     fn.Call(@ctx.Global, [one, two, 3])
 
-    expect(@ctx.Global.Get(@ctx, V8::C::String.NewFromUtf8(@isolate, 'one')).FromJust().StrictEquals(one)).to be true
+    expect(@ctx.Global.Get(@ctx, V8::C::String.NewFromUtf8(@isolate, 'one'))).to strict_eq one
-    expect(@ctx.Global.Get(@ctx, V8::C::String.NewFromUtf8(@isolate, 'two')).FromJust().StrictEquals(two)).to be true
+    expect(@ctx.Global.Get(@ctx, V8::C::String.NewFromUtf8(@isolate, 'two'))).to strict_eq two
     expect(@ctx.Global.Get(@ctx, V8::C::String.NewFromUtf8(@isolate, 'three')).FromJust().Value()).to eq 3
   end
 
@@ -77,7 +77,7 @@ describe V8::C::Function do
       expect(callback.this.GetIdentityHash()).to eql @ctx.Global().GetIdentityHash()
       expect(callback.is_construct_call).to be false
       expect(callback.data).not_to be_nil
-      expect(callback.data.StrictEquals(data)).to be true
+      expect(callback.data).to strict_eq data
     end
   end
 

spec/c/object_spec.rb

@@ -12,39 +12,25 @@ describe V8::C::Object do
     key = V8::C::String.NewFromUtf8(@isolate, 'foo')
     value = V8::C::String.NewFromUtf8(@isolate, 'bar')
 
-    maybe = o.Set(@ctx, key, value)
+    expect(o.Set(@ctx, key, value)).to be_successful
-    expect(maybe.IsJust()).to be true
+    expect(o.Get(@ctx, key)).to strict_eq value
-    expect(maybe.FromJust()).to be true
-
-    maybe = o.Get(@ctx, key)
-    expect(maybe.IsJust()).to be true
-    expect(maybe.FromJust().Utf8Value).to eq 'bar'
   end
 
   it 'can determine if a key has been set' do
     o = V8::C::Object.New(@isolate)
     key = V8::C::String.NewFromUtf8(@isolate, 'foo')
 
-    o.Set(@ctx, key, key)
+    expect(o.Set(@ctx, key, key)).to be_successful
-
+    expect(o.Has(@ctx, key)).to be_successful
-    maybe = o.Has(@ctx, key)
-    expect(maybe.IsJust()).to be true
-    expect(maybe.FromJust()).to eq true
   end
 
   it 'can delete keys' do
     o = V8::C::Object.New(@isolate)
     key = V8::C::String.NewFromUtf8(@isolate, 'foo')
 
-    o.Set(@ctx, key, key)
+    expect(o.Set(@ctx, key, key)).to be_successful
-
+    expect(o.Delete(@ctx, key)).to be_successful
-    maybe = o.Delete(@ctx, key)
+    expect(o.Has(@ctx, key)).to eq_just false
-    expect(maybe.IsJust()).to be true
-    expect(maybe.FromJust()).to eq true
-
-    maybe = o.Has(@ctx, key)
-    expect(maybe.IsJust()).to be true
-    expect(maybe.FromJust()).to eq false
   end
 
   describe '#SetAccessor' do
@@ -65,14 +51,11 @@ describe V8::C::Object do
         info.GetReturnValue.Set(get_value)
       end
 
-      o.SetAccessor(@ctx, key, getter, nil, data)
+      expect(o.SetAccessor(@ctx, key, getter, nil, data)).to be_successful
+      expect(o.Get(@ctx, key)).to strict_eq get_value
 
-      maybe = o.Get(@ctx, key)
+      expect(get_name).to v8_eq key
-      expect(maybe.IsJust).to be true
+      expect(get_data).to strict_eq data
-      expect(maybe.FromJust.StrictEquals(get_value)).to be true
-
-      expect(get_name.Equals(key)).to be true
-      expect(get_data.StrictEquals(data)).to be true
     end
 
     it 'can set setters' do
@@ -89,14 +72,12 @@ describe V8::C::Object do
         set_value = value
       end
 
-      o.SetAccessor(@ctx, key, proc { }, setter, data)
+      expect(o.SetAccessor(@ctx, key, proc { }, setter, data)).to be_successful
 
-      maybe = o.Set(@ctx, key, data)
+      expect(o.Set(@ctx, key, data)).to be_successful
-      expect(maybe.IsJust).to be true
-      expect(maybe.FromJust).to be true
 
-      expect(set_data.StrictEquals(data)).to be true
+      expect(set_data).to strict_eq data
-      expect(set_value.StrictEquals(data)).to be true
+      expect(set_value).to strict_eq data
     end
   end
 

spec/c/symbol_spec.rb

@@ -35,7 +35,7 @@ describe V8::C::Symbol do
     end
 
     it "returns different symbols for different registries" do
-      expect(global.StrictEquals(api)).to be false
+      expect(global).to_not strict_eq api
     end
   end
 

spec/c_spec_helper.rb

@@ -1,30 +1,3 @@
 require 'v8/init'
 
-module V8ContextHelpers
+Dir["#{File.dirname(__FILE__)}/support/*.rb"].each { |helper| require_relative helper }
-  module GroupMethods
-    def requires_v8_context
-      around(:each) do |example|
-        bootstrap_v8_context(&example)
-      end
-    end
-  end
-
-  def bootstrap_v8_context
-    @isolate = V8::C::Isolate.New
-
-    V8::C::HandleScope(@isolate) do
-      @ctx = V8::C::Context::New(@isolate)
-      begin
-        @ctx.Enter
-        yield
-      ensure
-        @ctx.Exit
-      end
-    end
-  end
-end
-
-RSpec.configure do |c|
-  c.include V8ContextHelpers
-  c.extend V8ContextHelpers::GroupMethods
-end

spec/support/context.rb

@@ -0,0 +1,28 @@
+module V8ContextHelpers
+  module GroupMethods
+    def requires_v8_context
+      around(:each) do |example|
+        bootstrap_v8_context(&example)
+      end
+    end
+  end
+
+  def bootstrap_v8_context
+    @isolate = V8::C::Isolate.New
+
+    V8::C::HandleScope(@isolate) do
+      @ctx = V8::C::Context::New(@isolate)
+      begin
+        @ctx.Enter
+        yield
+      ensure
+        @ctx.Exit
+      end
+    end
+  end
+end
+
+RSpec.configure do |c|
+  c.include V8ContextHelpers
+  c.extend V8ContextHelpers::GroupMethods
+end

spec/support/v8_matchers.rb

@@ -0,0 +1,45 @@
+module V8Matchers
+  extend RSpec::Matchers::DSL
+
+  matcher :eq_just do |expected|
+    match do |maybe|
+      return false unless maybe.IsJust
+
+      maybe.FromJust == expected
+    end
+  end
+
+  matcher :be_successful do
+    match do |maybe|
+      return false unless maybe.IsJust
+
+      maybe.FromJust
+    end
+  end
+
+  matcher :strict_eq do |expected|
+    match do |object|
+      if object.respond_to? 'IsJust'
+        return false unless object.IsJust
+        object = object.FromJust
+      end
+
+      object.StrictEquals(expected)
+    end
+  end
+
+  matcher :v8_eq do |expected|
+    match do |object|
+      if object.respond_to? 'IsJust'
+        return false unless object.IsJust
+        object = object.FromJust
+      end
+
+      object.Equals(expected)
+    end
+  end
+end
+
+RSpec.configure do |c|
+  c.include V8Matchers
+end