spec: check that error is about whitespace correctly.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

spec/unit/type/package_accept_keywords_spec.rb

@@ -36,7 +36,7 @@ describe Puppet::Type.type(:package_accept_keywords) do
     end
 
     it "should reject accept_keywords with a space" do
-      expect { described_class.new(:name => "sys-devel/gcc", :accept_keywords => "~amd 64") }.to raise_error(ArgumentError)
+      expect { described_class.new(:name => "sys-devel/gcc", :accept_keywords => "~amd 64") }.to raise_error(/cannot contain whitespace/)
     end
 
     it "should accept an array for accept_keywords" do

spec/unit/type/package_keywords_spec.rb

@@ -36,7 +36,7 @@ describe Puppet::Type.type(:package_keywords) do
     end
 
     it "should reject keywords with a space" do
-      expect { described_class.new(:name => "sys-devel/gcc", :keywords => "~amd 64") }.to raise_error(ArgumentError)
+      expect { described_class.new(:name => "sys-devel/gcc", :keywords => "~amd 64") }.to raise_error(/cannot contain whitespace/)
     end
 
     it "should accept an array for keywords" do

spec/unit/type/package_use_spec.rb

@@ -36,7 +36,7 @@ describe Puppet::Type.type(:package_use) do
     end
 
     it "should reject use flags with a space" do
-      expect { described_class.new(:name => "sys-devel/gcc", :use => "open mp") }.to raise_error(ArgumentError)
+      expect { described_class.new(:name => "sys-devel/gcc", :use => "open mp") }.to raise_error(/cannot contain whitespace/)
     end
 
     it "should accept an array for use" do