1 files changed, 27 insertions, 25 deletions
diff --git a/spec/ruby/CONTRIBUTING.md b/spec/ruby/CONTRIBUTING.md
index adfc2fb0ca..0b0f251440 100644
--- a/spec/ruby/CONTRIBUTING.md
+++ b/spec/ruby/CONTRIBUTING.md
@@ -55,6 +55,11 @@ which indicates the file was generated but the method unspecified.
 Here is a list of frequently-used matchers, which should be enough for most specs.
 There are a few extra specific matchers used in the couple specs that need it.
 
+The general idea is: add `.should` just before the predicate you expect to be truthy, and done!
+This works for most needs and provides a great error when it fails.
+It's immediately clear which method is used and there no need to remember a mapping like in RSpec between e.g. `eq` and `==`.
+See [this blog post](https://eregon.me/blog/2019/10/07/a-new-should-syntax.html) for the motivation behind that syntax.
+
 #### Comparison matchers
 
 ```ruby
@@ -83,43 +88,37 @@ File.should.equal?(File) # Calls #equal? (tests identity)
 
 (0.1 + 0.2).should be_close(0.3, TOLERANCE) # (0.2-0.1).abs < TOLERANCE
 (0.0/0.0).should.nan?
-(1.0/0.0).should be_positive_infinity
-(-1.0/0.0).should be_negative_infinity
 
-3.14.should be_an_instance_of(Float) # Calls #instance_of?
-3.14.should be_kind_of(Numeric) # Calls #is_a?
-Numeric.should be_ancestor_of(Float) # Float.ancestors.include?(Numeric)
+3.14.should.instance_of?(Float) # Calls #instance_of?
+3.14.should.is_a?(Numeric) # Calls #is_a?
 
 3.14.should.respond_to?(:to_i)
-Integer.should have_instance_method(:+)
-Array.should have_method(:new)
+Integer.should.method_defined?(:+, false)
 ```
 
-Also `have_constant`, `have_private_instance_method`, `have_singleton_method`, etc.
-
 #### Exception matchers
 
 ```ruby
 -> {
   raise "oops"
-}.should raise_error(RuntimeError, /oops/)
+}.should.raise(RuntimeError, /oops/)
 
 -> {
   raise "oops"
-}.should raise_error(RuntimeError) { |e|
+}.should.raise(RuntimeError) { |e|
   # Custom checks on the Exception object
   e.message.should.include?("oops")
   e.cause.should == nil
 }
 ```
 
-##### should_not raise_error
+##### `should_not.raise`
 
-**To avoid!** Instead, use an expectation testing what the code in the lambda does.
+**Avoid this!** Instead, use an expectation testing what the code in the lambda does.
 If an exception is raised, it will fail the example anyway.
 
 ```ruby
--> { ... }.should_not raise_error
+-> { ... }.should_not.raise
 ```
 
 #### Warning matcher
@@ -138,12 +137,12 @@ Here is a list of the most commonly-used guards:
 #### Version guards
 
 ```ruby
-ruby_version_is ""..."2.6" do
-  # Specs for RUBY_VERSION < 2.6
+ruby_version_is ""..."3.2" do
+  # Specs for RUBY_VERSION < 3.2
 end
 
-ruby_version_is "2.6" do
-  # Specs for RUBY_VERSION >= 2.6
+ruby_version_is "3.2" do
+  # Specs for RUBY_VERSION >= 3.2
 end
 ```
 
@@ -164,7 +163,7 @@ end
 platform_is_not :linux, :darwin do # Not Linux and not Darwin
 end
 
-platform_is wordsize: 64 do
+platform_is pointer_size: 64 do
   # 64-bit platform
 end
 
@@ -179,6 +178,9 @@ In case there is a bug in MRI and the fix will be backported to previous version
 If it is not backported or not likely, use `ruby_version_is` instead.
 First, file a bug at https://bugs.ruby-lang.org/.
 The problem is `ruby_bug` would make non-MRI implementations fail this spec while MRI itself does not pass it, so it should only be used if the bug is/will be fixed and backported.
+Otherwise, non-MRI implementations would have to choose between being incompatible with the latest release of MRI (which has the bug) to pass the spec, or behave the same as the latest release of MRI (which has the bug) and fail the spec, both which make no sense.
+
+IOW, `ruby_bug '#NN', ''...'X.Y' do` is equivalent to `guard_not { RUBY_ENGINE == "ruby" && ruby_version_is ''...'X.Y' } do`. So it skips tests on MRI on specified versions (where a bug is present) and runs tests on alternative implementations only.
 
 ```ruby
 ruby_bug '#13669', ''...'3.2' do
@@ -191,11 +193,11 @@ end
 #### Combining guards
 
 ```ruby
-guard -> { platform_is :windows and ruby_version_is ""..."2.6" } do
-  # Windows and RUBY_VERSION < 2.6
+guard -> { platform_is :windows and ruby_version_is ""..."3.2" } do
+  # Windows and RUBY_VERSION < 3.2
 end
 
-guard_not -> { platform_is :windows and ruby_version_is ""..."2.6" } do
+guard_not -> { platform_is :windows and ruby_version_is ""..."3.2" } do
   # The opposite
 end
 ```
@@ -271,18 +273,18 @@ how this is used currently:
 ```ruby
 describe :kernel_sprintf, shared: true do
   it "raises TypeError exception if cannot convert to Integer" do
-    -> { @method.call("%b", Object.new) }.should raise_error(TypeError)
+    -> { @method.call("%b", Object.new) }.should.raise(TypeError)
   end
 end
 
 describe "Kernel#sprintf" do
-  it_behaves_like :kernel_sprintf, -> (format, *args) {
+  it_behaves_like :kernel_sprintf, -> format, *args {
     sprintf(format, *args)
   }
 end
 
 describe "Kernel.sprintf" do
-  it_behaves_like :kernel_sprintf, -> (format, *args) {
+  it_behaves_like :kernel_sprintf, -> format, *args {
     Kernel.sprintf(format, *args)
   }
 end