1 files changed, 35 insertions, 0 deletions
diff --git a/spec/ruby/library/date/valid_commercial_spec.rb b/spec/ruby/library/date/valid_commercial_spec.rb
new file mode 100644
index 0000000000..21a91ad867
--- /dev/null
+++ b/spec/ruby/library/date/valid_commercial_spec.rb
@@ -0,0 +1,35 @@
+require_relative '../../spec_helper'
+require 'date'
+
+describe "Date.valid_commercial?" do
+  it "returns true if it is a valid commercial date" do
+    # October 1582 (the Gregorian calendar, Commercial Date)
+    #      M Tu  W Th  F Sa Su
+    # 39:  1  2  3  4  5  6  7
+    # 40:  1  2  3  4  5  6  7
+    # 41:  1  2  3  4  5  6  7
+    Date.valid_commercial?(1582, 39, 4).should == true
+    Date.valid_commercial?(1582, 39, 5).should == true
+    Date.valid_commercial?(1582, 41, 4).should == true
+    Date.valid_commercial?(1582, 41, 5).should == true
+    Date.valid_commercial?(1582, 41, 4, Date::ENGLAND).should == true
+    Date.valid_commercial?(1752, 37, 4, Date::ENGLAND).should == true
+  end
+
+  it "returns false it is not a valid commercial date" do
+    Date.valid_commercial?(1999, 53, 1).should == false
+  end
+
+  it "handles negative week and day numbers" do
+    # October 1582 (the Gregorian calendar, Commercial Date)
+    #       M Tu  W Th  F Sa Su
+    # -12: -7 -6 -5 -4 -3 -2 -1
+    # -11: -7 -6 -5 -4 -3 -2 -1
+    # -10: -7 -6 -5 -4 -3 -2 -1
+    Date.valid_commercial?(1582, -12, -4).should == true
+    Date.valid_commercial?(1582, -12, -3).should == true
+    Date.valid_commercial?(2007, -44, -2).should == true
+    Date.valid_commercial?(2008, -44, -2).should == true
+    Date.valid_commercial?(1999, -53, -1).should == false
+  end
+end