--- /dev/null
+#Based on patch from Wilson Bilkovich
+
+require File.dirname(__FILE__) + '/../../spec_helper.rb'
+class SomethingExpected
+ attr_accessor :some_value
+end
+
+describe "should change(actual, message)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when actual is modified by the block" do
+ lambda {@instance.some_value = 6}.should change(@instance, :some_value)
+ end
+
+ it "should fail when actual is not modified by the block" do
+ lambda do
+ lambda {}.should change(@instance, :some_value)
+ end.should fail_with("some_value should have changed, but is still 5")
+ end
+end
+
+describe "should_not change(actual, message)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when actual is not modified by the block" do
+ lambda { }.should_not change(@instance, :some_value)
+ end
+
+ it "should fail when actual is not modified by the block" do
+ lambda do
+ lambda {@instance.some_value = 6}.should_not change(@instance, :some_value)
+ end.should fail_with("some_value should not have changed, but did change from 5 to 6")
+ end
+end
+
+describe "should change { block }" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when actual is modified by the block" do
+ lambda {@instance.some_value = 6}.should change { @instance.some_value }
+ end
+
+ it "should fail when actual is not modified by the block" do
+ lambda do
+ lambda {}.should change{ @instance.some_value }
+ end.should fail_with("result should have changed, but is still 5")
+ end
+
+ it "should warn if passed a block using do/end" do
+ lambda do
+ lambda {}.should change do
+ end
+ end.should raise_error(Spec::Matchers::MatcherError, /block passed to should or should_not/)
+ end
+end
+
+describe "should_not change { block }" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when actual is modified by the block" do
+ lambda {}.should_not change{ @instance.some_value }
+ end
+
+ it "should fail when actual is not modified by the block" do
+ lambda do
+ lambda {@instance.some_value = 6}.should_not change { @instance.some_value }
+ end.should fail_with("result should not have changed, but did change from 5 to 6")
+ end
+
+ it "should warn if passed a block using do/end" do
+ lambda do
+ lambda {}.should_not change do
+ end
+ end.should raise_error(Spec::Matchers::MatcherError, /block passed to should or should_not/)
+ end
+end
+
+describe "should change(actual, message).by(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by expected amount" do
+ lambda { @instance.some_value += 1 }.should change(@instance, :some_value).by(1)
+ end
+
+ it "should fail when the attribute is changed by unexpected amount" do
+ lambda do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by(1)
+ end.should fail_with("some_value should have been changed by 1, but was changed by 2")
+ end
+
+ it "should fail when the attribute is changed by unexpected amount in the opposite direction" do
+ lambda do
+ lambda { @instance.some_value -= 1 }.should change(@instance, :some_value).by(1)
+ end.should fail_with("some_value should have been changed by 1, but was changed by -1")
+ end
+end
+
+describe "should change{ block }.by(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by expected amount" do
+ lambda { @instance.some_value += 1 }.should change{@instance.some_value}.by(1)
+ end
+
+ it "should fail when the attribute is changed by unexpected amount" do
+ lambda do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by(1)
+ end.should fail_with("result should have been changed by 1, but was changed by 2")
+ end
+
+ it "should fail when the attribute is changed by unexpected amount in the opposite direction" do
+ lambda do
+ lambda { @instance.some_value -= 1 }.should change{@instance.some_value}.by(1)
+ end.should fail_with("result should have been changed by 1, but was changed by -1")
+ end
+end
+
+describe "should change(actual, message).by_at_least(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by greater than the expected amount" do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by_at_least(1)
+ end
+
+ it "should pass when attribute is changed by the expected amount" do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by_at_least(2)
+ end
+
+ it "should fail when the attribute is changed by less than the expected amount" do
+ lambda do
+ lambda { @instance.some_value += 1 }.should change(@instance, :some_value).by_at_least(2)
+ end.should fail_with("some_value should have been changed by at least 2, but was changed by 1")
+ end
+
+end
+
+describe "should change{ block }.by_at_least(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by greater than expected amount" do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by_at_least(1)
+ end
+
+ it "should pass when attribute is changed by the expected amount" do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by_at_least(2)
+ end
+
+ it "should fail when the attribute is changed by less than the unexpected amount" do
+ lambda do
+ lambda { @instance.some_value += 1 }.should change{@instance.some_value}.by_at_least(2)
+ end.should fail_with("result should have been changed by at least 2, but was changed by 1")
+ end
+end
+
+
+describe "should change(actual, message).by_at_most(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by less than the expected amount" do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by_at_most(3)
+ end
+
+ it "should pass when attribute is changed by the expected amount" do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by_at_most(2)
+ end
+
+ it "should fail when the attribute is changed by greater than the expected amount" do
+ lambda do
+ lambda { @instance.some_value += 2 }.should change(@instance, :some_value).by_at_most(1)
+ end.should fail_with("some_value should have been changed by at most 1, but was changed by 2")
+ end
+
+end
+
+describe "should change{ block }.by_at_most(expected)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 5
+ end
+
+ it "should pass when attribute is changed by less than expected amount" do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by_at_most(3)
+ end
+
+ it "should pass when attribute is changed by the expected amount" do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by_at_most(2)
+ end
+
+ it "should fail when the attribute is changed by greater than the unexpected amount" do
+ lambda do
+ lambda { @instance.some_value += 2 }.should change{@instance.some_value}.by_at_most(1)
+ end.should fail_with("result should have been changed by at most 1, but was changed by 2")
+ end
+end
+
+describe "should change(actual, message).from(old)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when attribute is == to expected value before executing block" do
+ lambda { @instance.some_value = "astring" }.should change(@instance, :some_value).from("string")
+ end
+
+ it "should fail when attribute is not == to expected value before executing block" do
+ lambda do
+ lambda { @instance.some_value = "knot" }.should change(@instance, :some_value).from("cat")
+ end.should fail_with("some_value should have initially been \"cat\", but was \"string\"")
+ end
+end
+
+describe "should change{ block }.from(old)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when attribute is == to expected value before executing block" do
+ lambda { @instance.some_value = "astring" }.should change{@instance.some_value}.from("string")
+ end
+
+ it "should fail when attribute is not == to expected value before executing block" do
+ lambda do
+ lambda { @instance.some_value = "knot" }.should change{@instance.some_value}.from("cat")
+ end.should fail_with("result should have initially been \"cat\", but was \"string\"")
+ end
+end
+
+describe "should change(actual, message).to(new)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when attribute is == to expected value after executing block" do
+ lambda { @instance.some_value = "cat" }.should change(@instance, :some_value).to("cat")
+ end
+
+ it "should fail when attribute is not == to expected value after executing block" do
+ lambda do
+ lambda { @instance.some_value = "cat" }.should change(@instance, :some_value).from("string").to("dog")
+ end.should fail_with("some_value should have been changed to \"dog\", but is now \"cat\"")
+ end
+end
+
+describe "should change{ block }.to(new)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when attribute is == to expected value after executing block" do
+ lambda { @instance.some_value = "cat" }.should change{@instance.some_value}.to("cat")
+ end
+
+ it "should fail when attribute is not == to expected value after executing block" do
+ lambda do
+ lambda { @instance.some_value = "cat" }.should change{@instance.some_value}.from("string").to("dog")
+ end.should fail_with("result should have been changed to \"dog\", but is now \"cat\"")
+ end
+end
+
+describe "should change(actual, message).from(old).to(new)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when #to comes before #from" do
+ lambda { @instance.some_value = "cat" }.should change(@instance, :some_value).to("cat").from("string")
+ end
+
+ it "should pass when #from comes before #to" do
+ lambda { @instance.some_value = "cat" }.should change(@instance, :some_value).from("string").to("cat")
+ end
+end
+
+describe "should change{ block }.from(old).to(new)" do
+ before(:each) do
+ @instance = SomethingExpected.new
+ @instance.some_value = 'string'
+ end
+
+ it "should pass when #to comes before #from" do
+ lambda { @instance.some_value = "cat" }.should change{@instance.some_value}.to("cat").from("string")
+ end
+
+ it "should pass when #from comes before #to" do
+ lambda { @instance.some_value = "cat" }.should change{@instance.some_value}.from("string").to("cat")
+ end
+end
projects / rails.git / blobdiff