Add a way to validate min and max value of an integer site setting

spec/components/validators/integer_setting_validator_spec.rb

@@ -0,0 +1,89 @@
+require 'spec_helper'
+
+describe IntegerSettingValidator do
+  describe '#valid_value?' do
+
+    shared_examples "for all IntegerSettingValidator opts" do
+      it "returns false for blank values" do
+        validator.valid_value?('').should == false
+        validator.valid_value?(nil).should == false
+      end
+
+      it "returns false if value is not a valid integer" do
+        validator.valid_value?('two').should == false
+      end
+    end
+
+    context "without min and max" do
+      subject(:validator) { described_class.new }
+
+      include_examples "for all IntegerSettingValidator opts"
+
+      it "returns true if value is a valid integer" do
+        validator.valid_value?(1).should == true
+        validator.valid_value?(-1).should == true
+        validator.valid_value?('1').should == true
+        validator.valid_value?('-1').should == true
+      end
+    end
+
+    context "with min" do
+      subject(:validator) { described_class.new(min: 2) }
+
+      include_examples "for all IntegerSettingValidator opts"
+
+      it "returns true if value is equal to min" do
+        validator.valid_value?(2).should == true
+        validator.valid_value?('2').should == true
+      end
+
+      it "returns true if value is greater than min" do
+        validator.valid_value?(3).should == true
+        validator.valid_value?('3').should == true
+      end
+
+      it "returns false if value is less than min" do
+        validator.valid_value?(1).should == false
+        validator.valid_value?('1').should == false
+      end
+    end
+
+    context "with max" do
+      subject(:validator) { described_class.new(max: 3) }
+
+      include_examples "for all IntegerSettingValidator opts"
+
+      it "returns true if value is equal to max" do
+        validator.valid_value?(3).should == true
+        validator.valid_value?('3').should == true
+      end
+
+      it "returns true if value is less than max" do
+        validator.valid_value?(2).should == true
+        validator.valid_value?('2').should == true
+      end
+
+      it "returns false if value is greater than min" do
+        validator.valid_value?(4).should == false
+        validator.valid_value?('4').should == false
+      end
+    end
+
+    context "with min and max" do
+      subject(:validator) { described_class.new(min: -1, max: 3) }
+
+      include_examples "for all IntegerSettingValidator opts"
+
+      it "returns true if value is in range" do
+        validator.valid_value?(-1).should == true
+        validator.valid_value?(0).should == true
+        validator.valid_value?(3).should == true
+      end
+
+      it "returns false if value is out of range" do
+        validator.valid_value?(4).should == false
+        validator.valid_value?(-2).should == false
+      end
+    end
+  end
+end