RSpec-ExpectChange.md

Pattern: Inconsistent style of change matcher

Issue: -

Description

Checks for consistent style of change matcher.

Enforces either passing object and attribute as arguments to the matcher or passing a block that reads the attribute value.

This rule can be configured using the EnforcedStyle option.

Examples

EnforcedStyle: block

# bad
expect(run).to change(Foo, :bar)

# good
expect(run).to change { Foo.bar }

EnforcedStyle: method_call

# bad
expect(run).to change { Foo.bar }
expect(run).to change { foo.baz }

# good
expect(run).to change(Foo, :bar)
expect(run).to change(foo, :baz)
# also good when there are arguments or chained method calls
expect(run).to change { Foo.bar(:count) }
expect(run).to change { user.reload.name }

Configurable attributes

Name	Default value	Configurable values
EnforcedStyle	method_call	method_call, block

Further Reading

• RSpec - RSpec/ExpectChange
• http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/ExpectChange