Update date specs

Allow Date.new spec to run on 2.7.

Separate Date.valid_jd? specs, since 2.7 is now stricter and
requires numeric value for the first argument.

spec/ruby/library/date/parse_spec.rb

@@ -11,11 +11,9 @@ describe "Date#parse" do
     d.should == Date.commercial(d.cwyear, d.cweek, 5)
   end
 
-  ruby_version_is ''...'2.7' do
-    it "parses a month name into a Date object" do
-      d = Date.parse("october")
-      d.should == Date.civil(Date.today.year, 10)
-    end
+  it "parses a month name into a Date object" do
+    d = Date.parse("october")
+    d.should == Date.civil(Date.today.year, 10)
   end
 
   it "parses a month day into a Date object" do

spec/ruby/library/date/shared/valid_jd.rb

@@ -1,7 +1,8 @@
 describe :date_valid_jd?, shared: true do
-  it "returns true if passed any value other than nil" do
+  it "returns true if passed a number value" do
     Date.send(@method, -100).should be_true
-    Date.send(@method, :number).should be_true
+    Date.send(@method, 100.0).should be_true
+    Date.send(@method, 2**100).should be_true
     Date.send(@method, Rational(1,2)).should be_true
   end
 
@@ -9,7 +10,23 @@ describe :date_valid_jd?, shared: true do
     Date.send(@method, nil).should be_false
   end
 
-  it "returns true if passed false" do
-    Date.send(@method, false).should be_true
+  ruby_version_is ''...'2.7' do
+    it "returns true if passed symbol" do
+      Date.send(@method, :number).should be_true
+    end
+
+    it "returns true if passed false" do
+      Date.send(@method, false).should be_true
+    end
+  end
+
+  ruby_version_is '2.7' do
+    it "returns false if passed symbol" do
+      Date.send(@method, :number).should be_false
+    end
+
+    it "returns false if passed false" do
+      Date.send(@method, false).should be_false
+    end
   end
 end

spec/ruby/library/date/valid_jd_spec.rb

@@ -2,10 +2,8 @@ require_relative '../../spec_helper'
 require_relative 'shared/valid_jd'
 require 'date'
 
-ruby_version_is ''...'2.7' do
-  describe "Date.valid_jd?" do
+describe "Date.valid_jd?" do
 
-    it_behaves_like :date_valid_jd?, :valid_jd?
+  it_behaves_like :date_valid_jd?, :valid_jd?
 
-  end
 end