Update to ruby/spec@b0b7f53

17 files changed, 604 insertions, 42 deletions

diff --git a/spec/ruby/core/array/flatten_spec.rb b/spec/ruby/core/array/flatten_spec.rb
index b2aa015764..2f9fb8a3ec 100644
--- a/spec/ruby/core/array/flatten_spec.rb
+++ b/spec/ruby/core/array/flatten_spec.rb
@@ -90,7 +90,7 @@ describe "Array#flatten" do
       ArraySpecs::MyArray[].flatten.should be_an_instance_of(Array)
       ArraySpecs::MyArray[1, 2, 3].flatten.should be_an_instance_of(Array)
       ArraySpecs::MyArray[1, [2], 3].flatten.should be_an_instance_of(Array)
-      ArraySpecs::MyArray[1, [2, 3], 4].flatten.should == Array[1, 2, 3, 4]
+      ArraySpecs::MyArray[1, [2, 3], 4].flatten.should == [1, 2, 3, 4]
       [ArraySpecs::MyArray[1, 2, 3]].flatten.should be_an_instance_of(Array)
     end
   end
diff --git a/spec/ruby/core/exception/errno_spec.rb b/spec/ruby/core/exception/errno_spec.rb
index 78b3eafc2a..095a926e09 100644
--- a/spec/ruby/core/exception/errno_spec.rb
+++ b/spec/ruby/core/exception/errno_spec.rb
@@ -47,4 +47,12 @@ describe "Errno::ENOTSUP" do
   it "is defined" do
     Errno.should have_constant(:ENOTSUP)
   end
+
+  it "is the same class as Errno::EOPNOTSUPP if they represent the same errno value" do
+    if Errno::ENOTSUP::Errno == Errno::EOPNOTSUPP::Errno
+      Errno::ENOTSUP.should == Errno::EOPNOTSUPP
+    else
+      Errno::ENOTSUP.should_not == Errno::EOPNOTSUPP
+    end
+  end
 end
diff --git a/spec/ruby/core/exception/system_exit_spec.rb b/spec/ruby/core/exception/system_exit_spec.rb
new file mode 100644
index 0000000000..5c6116576b
--- /dev/null
+++ b/spec/ruby/core/exception/system_exit_spec.rb
@@ -0,0 +1,17 @@
+require_relative '../../spec_helper'
+
+describe "SystemExit" do
+  it "sets the exit status and exits silently when raised" do
+    code = 'raise SystemExit.new(7)'
+    result = ruby_exe(code, args: "2>&1")
+    result.should == ""
+    $?.exitstatus.should == 7
+  end
+
+  it "sets the exit status and exits silently when raised when subclassed" do
+    code = 'class CustomExit < SystemExit; end; raise CustomExit.new(8)'
+    result = ruby_exe(code, args: "2>&1")
+    result.should == ""
+    $?.exitstatus.should == 8
+  end
+end
diff --git a/spec/ruby/core/fiber/fixtures/classes.rb b/spec/ruby/core/fiber/fixtures/classes.rb
new file mode 100644
index 0000000000..c00facd6e1
--- /dev/null
+++ b/spec/ruby/core/fiber/fixtures/classes.rb
@@ -0,0 +1,12 @@
+module FiberSpecs
+
+  class NewFiberToRaise
+    def self.raise(*args)
+      fiber = Fiber.new { Fiber.yield }
+      fiber.resume
+      fiber.raise(*args)
+    end
+  end
+
+  class CustomError < StandardError; end
+end
diff --git a/spec/ruby/core/fiber/raise_spec.rb b/spec/ruby/core/fiber/raise_spec.rb
new file mode 100644
index 0000000000..fd1cc911b5
--- /dev/null
+++ b/spec/ruby/core/fiber/raise_spec.rb
@@ -0,0 +1,76 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative '../../shared/kernel/raise'
+
+ruby_version_is "2.7" do
+  describe "Fiber#raise" do
+    it_behaves_like :kernel_raise, :raise, FiberSpecs::NewFiberToRaise
+  end
+
+  describe "Fiber#raise" do
+    it 'raises RuntimeError by default' do
+      -> { FiberSpecs::NewFiberToRaise.raise }.should raise_error(RuntimeError)
+    end
+
+    it "raises FiberError if Fiber is not born" do
+      fiber = Fiber.new { true }
+      -> { fiber.raise }.should raise_error(FiberError, "cannot raise exception on unborn fiber")
+    end
+
+    it "raises FiberError if Fiber is dead" do
+      fiber = Fiber.new { true }
+      fiber.resume
+      -> { fiber.raise }.should raise_error(FiberError, /dead fiber called|attempt to resume a terminated fiber/)
+    end
+
+    it 'accepts error class' do
+      -> { FiberSpecs::NewFiberToRaise.raise FiberSpecs::CustomError }.should raise_error(FiberSpecs::CustomError)
+    end
+
+    it 'accepts error message' do
+      -> { FiberSpecs::NewFiberToRaise.raise "error message" }.should raise_error(RuntimeError, "error message")
+    end
+
+    it 'does not accept array of backtrace information only' do
+      -> { FiberSpecs::NewFiberToRaise.raise ['foo'] }.should raise_error(TypeError)
+    end
+
+    it 'does not accept integer' do
+      -> { FiberSpecs::NewFiberToRaise.raise 100 }.should raise_error(TypeError)
+    end
+
+    it 'accepts error class with error message' do
+      -> { FiberSpecs::NewFiberToRaise.raise FiberSpecs::CustomError, 'test error' }.should raise_error(FiberSpecs::CustomError, 'test error')
+    end
+
+    it 'accepts error class with with error message and backtrace information' do
+      -> {
+        FiberSpecs::NewFiberToRaise.raise FiberSpecs::CustomError, 'test error', ['foo', 'boo']
+      }.should raise_error(FiberSpecs::CustomError) { |e|
+        e.message.should == 'test error'
+        e.backtrace.should == ['foo', 'boo']
+      }
+    end
+
+    it 'does not accept only error message and backtrace information' do
+      -> { FiberSpecs::NewFiberToRaise.raise 'test error', ['foo', 'boo'] }.should raise_error(TypeError)
+    end
+
+    it "raises a FiberError if invoked from a different Thread" do
+      fiber = Fiber.new { Fiber.yield }
+      fiber.resume
+      Thread.new do
+        -> {
+          fiber.raise
+        }.should raise_error(FiberError, "fiber called across threads")
+      end.join
+    end
+
+    it "kills Fiber" do
+      fiber = Fiber.new { Fiber.yield :first; :second }
+      fiber.resume
+      -> { fiber.raise }.should raise_error
+      -> { fiber.resume }.should raise_error(FiberError, /dead fiber called|attempt to resume a terminated fiber/)
+    end
+  end
+end
diff --git a/spec/ruby/core/file/extname_spec.rb b/spec/ruby/core/file/extname_spec.rb
index e9b53bc24d..e182ed44f2 100644
--- a/spec/ruby/core/file/extname_spec.rb
+++ b/spec/ruby/core/file/extname_spec.rb
@@ -12,6 +12,16 @@ describe "File.extname" do
     File.extname(".app.conf").should == ".conf"
   end
 
+  it "returns unfrozen strings" do
+    File.extname("foo.rb").frozen?.should == false
+    File.extname("/foo/bar.rb").frozen?.should == false
+    File.extname("/foo.rb/bar.c").frozen?.should == false
+    File.extname("bar").frozen?.should == false
+    File.extname(".bashrc").frozen?.should == false
+    File.extname("/foo.bar/baz").frozen?.should == false
+    File.extname(".app.conf").frozen?.should == false
+  end
+
   it "returns the extension for edge cases" do
     File.extname("").should ==  ""
     File.extname(".").should ==  ""
diff --git a/spec/ruby/core/integer/shared/comparison_coerce.rb b/spec/ruby/core/integer/shared/comparison_coerce.rb
index 50437f77f5..af52f5e99b 100644
--- a/spec/ruby/core/integer/shared/comparison_coerce.rb
+++ b/spec/ruby/core/integer/shared/comparison_coerce.rb
@@ -1,27 +1,5 @@
 require_relative '../fixtures/classes'
 
-describe :integer_comparison_coerce_rescue, shared: true do
-  it "rescues exception (StandardError and subclasses) raised in other#coerce and raises ArgumentError" do
-    b = mock("numeric with failed #coerce")
-    b.should_receive(:coerce).and_raise(IntegerSpecs::CoerceError)
-
-    # e.g. 1 > b
-    -> {
-      -> { 1.send(@method, b) }.should raise_error(ArgumentError, /comparison of Integer with MockObject failed/)
-    }.should complain(/Numerical comparison operators will no more rescue exceptions of #coerce/)
-  end
-
-  it "does not rescue Exception and StandardError siblings raised in other#coerce" do
-    [Exception, NoMemoryError].each do |exception|
-      b = mock("numeric with failed #coerce")
-      b.should_receive(:coerce).and_raise(exception)
-
-      # e.g. 1 > b
-      -> { 1.send(@method, b) }.should raise_error(exception)
-    end
-  end
-end
-
 describe :integer_comparison_coerce_not_rescue, shared: true do
   it "does not rescue exception raised in other#coerce" do
     b = mock("numeric with failed #coerce")
diff --git a/spec/ruby/core/io/set_encoding_by_bom_spec.rb b/spec/ruby/core/io/set_encoding_by_bom_spec.rb
new file mode 100644
index 0000000000..b8e4eedcb9
--- /dev/null
+++ b/spec/ruby/core/io/set_encoding_by_bom_spec.rb
@@ -0,0 +1,57 @@
+require_relative '../../spec_helper'
+
+describe "IO#set_encoding_by_bom" do
+  before :each do
+    @name = tmp('io_set_encoding_by_bom.txt')
+    touch(@name)
+    @io = new_io(@name, 'rb')
+  end
+
+  after :each do
+    @io.close unless @io.closed?
+    rm_r @name
+  end
+
+  ruby_version_is "2.7" do
+    it "returns the result encoding if found BOM UTF-8 sequence" do
+      File.binwrite(@name, "\u{FEFF}abc")
+
+      @io.set_encoding_by_bom.should == Encoding::UTF_8
+      @io.external_encoding.should == Encoding::UTF_8
+    end
+
+    it "returns the result encoding if found BOM UTF_16LE sequence" do
+      File.binwrite(@name, "\xFF\xFEabc")
+
+      @io.set_encoding_by_bom.should == Encoding::UTF_16LE
+      @io.external_encoding.should == Encoding::UTF_16LE
+    end
+
+    it "returns the result encoding if found BOM UTF_16BE sequence" do
+      File.binwrite(@name, "\xFE\xFFabc")
+
+      @io.set_encoding_by_bom.should == Encoding::UTF_16BE
+      @io.external_encoding.should == Encoding::UTF_16BE
+    end
+
+    it "returns nil if found BOM sequence not provided" do
+      File.write(@name, "abc")
+
+      @io.set_encoding_by_bom.should == nil
+    end
+
+    it 'returns exception if io not in binary mode' do
+      not_binary_io = new_io(@name, 'r')
+
+      -> { not_binary_io.set_encoding_by_bom }.should raise_error(ArgumentError, 'ASCII incompatible encoding needs binmode')
+    ensure
+      not_binary_io.close
+    end
+
+    it 'returns exception if encoding already set' do
+      @io.set_encoding("utf-8")
+
+      -> { @io.set_encoding_by_bom }.should raise_error(ArgumentError, 'encoding is set to UTF-8 already')
+    end
+  end
+end
diff --git a/spec/ruby/core/kernel/respond_to_spec.rb b/spec/ruby/core/kernel/respond_to_spec.rb
index e7efc9f275..5b3ea3f651 100644
--- a/spec/ruby/core/kernel/respond_to_spec.rb
+++ b/spec/ruby/core/kernel/respond_to_spec.rb
@@ -25,7 +25,7 @@ describe "Kernel#respond_to?" do
   end
 
   it "throws a type error if argument can't be coerced into a Symbol" do
-    -> { @a.respond_to?(Object.new) }.should raise_error(TypeError)
+    -> { @a.respond_to?(Object.new) }.should raise_error(TypeError, /is not a symbol nor a string/)
   end
 
   it "returns false if obj responds to the given protected method" do
@@ -69,5 +69,4 @@ describe "Kernel#respond_to?" do
     KernelSpecs::Foo.new.respond_to?(:bar).should == true
     KernelSpecs::Foo.new.respond_to?(:invalid_and_silly_method_name).should == false
   end
-
 end
diff --git a/spec/ruby/core/module/const_source_location_spec.rb b/spec/ruby/core/module/const_source_location_spec.rb
new file mode 100644
index 0000000000..9e1f2c1c49
--- /dev/null
+++ b/spec/ruby/core/module/const_source_location_spec.rb
@@ -0,0 +1,220 @@
+require_relative '../../spec_helper'
+require_relative '../../fixtures/constants'
+
+describe "Module#const_source_location" do
+  before do
+    @constants_fixture_path = File.expand_path('../../fixtures/constants.rb', __dir__)
+  end
+
+  ruby_version_is "2.7" do
+    describe "with dynamically assigned constants" do
+      it "searches a path in the immediate class or module first" do
+        ConstantSpecs::ClassA::CSL_CONST301 = :const301_1
+        ConstantSpecs::ClassA.const_source_location(:CSL_CONST301).should == [__FILE__, __LINE__ - 1]
+
+        ConstantSpecs::ModuleA::CSL_CONST301 = :const301_2
+        ConstantSpecs::ModuleA.const_source_location(:CSL_CONST301).should == [__FILE__, __LINE__ - 1]
+
+        ConstantSpecs::ParentA::CSL_CONST301 = :const301_3
+        ConstantSpecs::ParentA.const_source_location(:CSL_CONST301).should == [__FILE__, __LINE__ - 1]
+
+        ConstantSpecs::ContainerA::ChildA::CSL_CONST301 = :const301_5
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CSL_CONST301).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "searches a path in a module included in the immediate class before the superclass" do
+        ConstantSpecs::ParentB::CSL_CONST302 = :const302_1
+        ConstantSpecs::ModuleF::CSL_CONST302 = :const302_2
+        ConstantSpecs::ContainerB::ChildB.const_source_location(:CSL_CONST302).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "searches a path in the superclass before a module included in the superclass" do
+        ConstantSpecs::ModuleE::CSL_CONST303 = :const303_1
+        ConstantSpecs::ParentB::CSL_CONST303 = :const303_2
+        ConstantSpecs::ContainerB::ChildB.const_source_location(:CSL_CONST303).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "searches a path in a module included in the superclass" do
+        ConstantSpecs::ModuleA::CSL_CONST304 = :const304_1
+        ConstantSpecs::ModuleE::CSL_CONST304 = :const304_2
+        ConstantSpecs::ContainerB::ChildB.const_source_location(:CSL_CONST304).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "searches a path in the superclass chain" do
+        ConstantSpecs::ModuleA::CSL_CONST305 = :const305
+        ConstantSpecs::ContainerB::ChildB.const_source_location(:CSL_CONST305).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "returns path to a toplevel constant when the receiver is a Class" do
+        Object::CSL_CONST306 = :const306
+        ConstantSpecs::ContainerB::ChildB.const_source_location(:CSL_CONST306).should == [__FILE__, __LINE__ - 1]
+      end
+
+      it "returns path to a toplevel constant when the receiver is a Module" do
+        Object::CSL_CONST308 = :const308
+        ConstantSpecs.const_source_location(:CSL_CONST308).should == [__FILE__, __LINE__ - 1]
+        ConstantSpecs::ModuleA.const_source_location(:CSL_CONST308).should == [__FILE__, __LINE__ - 2]
+      end
+
+      it "returns path to the updated value of a constant" do
+        ConstantSpecs::ClassB::CSL_CONST309 = :const309_1
+        ConstantSpecs::ClassB.const_source_location(:CSL_CONST309).should == [__FILE__, __LINE__ - 1]
+
+        -> {
+          ConstantSpecs::ClassB::CSL_CONST309 = :const309_2
+        }.should complain(/already initialized constant/)
+        ConstantSpecs::ClassB.const_source_location(:CSL_CONST309).should == [__FILE__, __LINE__ - 2]
+      end
+    end
+
+    describe "with statically assigned constants" do
+      it "searches location path the immediate class or module first" do
+        ConstantSpecs::ClassA.const_source_location(:CS_CONST10).should == [@constants_fixture_path, ConstantSpecs::ClassA::CS_CONST10_LINE]
+        ConstantSpecs::ModuleA.const_source_location(:CS_CONST10).should == [@constants_fixture_path, ConstantSpecs::ModuleA::CS_CONST10_LINE]
+        ConstantSpecs::ParentA.const_source_location(:CS_CONST10).should == [@constants_fixture_path, ConstantSpecs::ParentA::CS_CONST10_LINE]
+        ConstantSpecs::ContainerA.const_source_location(:CS_CONST10).should == [@constants_fixture_path, ConstantSpecs::ContainerA::CS_CONST10_LINE]
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST10).should == [@constants_fixture_path, ConstantSpecs::ContainerA::ChildA::CS_CONST10_LINE]
+      end
+
+      it "searches location path a module included in the immediate class before the superclass" do
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST15).should == [@constants_fixture_path, ConstantSpecs::ModuleC::CS_CONST15_LINE]
+      end
+
+      it "searches location path the superclass before a module included in the superclass" do
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST11).should == [@constants_fixture_path, ConstantSpecs::ParentA::CS_CONST11_LINE]
+      end
+
+      it "searches location path a module included in the superclass" do
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST12).should == [@constants_fixture_path, ConstantSpecs::ModuleB::CS_CONST12_LINE]
+      end
+
+      it "searches location path the superclass chain" do
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST13).should == [@constants_fixture_path, ConstantSpecs::ModuleA::CS_CONST13_LINE]
+      end
+
+      it "returns location path a toplevel constant when the receiver is a Class" do
+        ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST1).should == [@constants_fixture_path, CS_CONST1_LINE]
+      end
+
+      it "returns location path a toplevel constant when the receiver is a Module" do
+        ConstantSpecs.const_source_location(:CS_CONST1).should == [@constants_fixture_path, CS_CONST1_LINE]
+        ConstantSpecs::ModuleA.const_source_location(:CS_CONST1).should == [@constants_fixture_path, CS_CONST1_LINE]
+      end
+    end
+
+    it "return empty path if constant defined in C code" do
+      Object.const_source_location(:String).should == []
+    end
+
+    it "accepts a String or Symbol name" do
+      Object.const_source_location(:CS_CONST1).should == [@constants_fixture_path, CS_CONST1_LINE]
+      Object.const_source_location("CS_CONST1").should == [@constants_fixture_path, CS_CONST1_LINE]
+    end
+
+    it "returns nil if no constant is defined in the search path" do
+      ConstantSpecs.const_source_location(:CS_CONSTX).should == nil
+    end
+
+    it "raises a NameError if the name does not start with a capital letter" do
+      -> { ConstantSpecs.const_source_location "name" }.should raise_error(NameError)
+    end
+
+    it "raises a NameError if the name starts with a non-alphabetic character" do
+      -> { ConstantSpecs.const_source_location "__CONSTX__" }.should raise_error(NameError)
+      -> { ConstantSpecs.const_source_location "@CS_CONST1" }.should raise_error(NameError)
+      -> { ConstantSpecs.const_source_location "!CS_CONST1" }.should raise_error(NameError)
+    end
+
+    it "raises a NameError if the name contains non-alphabetic characters except '_'" do
+      Object.const_source_location("CS_CONST1").should == [@constants_fixture_path, CS_CONST1_LINE]
+      -> { ConstantSpecs.const_source_location "CS_CONST1=" }.should raise_error(NameError)
+      -> { ConstantSpecs.const_source_location "CS_CONST1?" }.should raise_error(NameError)
+    end
+
+    it "calls #to_str to convert the given name to a String" do
+      name = mock("ClassA")
+      name.should_receive(:to_str).and_return("ClassA")
+      ConstantSpecs.const_source_location(name).should == [@constants_fixture_path, ConstantSpecs::ClassA::CS_CLASS_A_LINE]
+    end
+
+    it "raises a TypeError if conversion to a String by calling #to_str fails" do
+      name = mock('123')
+      -> { ConstantSpecs.const_source_location(name) }.should raise_error(TypeError)
+
+      name.should_receive(:to_str).and_return(123)
+      -> { ConstantSpecs.const_source_location(name) }.should raise_error(TypeError)
+    end
+
+    it "does not search the singleton class of a Class or Module" do
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST14).should == nil
+      ConstantSpecs.const_source_location(:CS_CONST14).should == nil
+    end
+
+    it "does not search the containing scope" do
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST20).should == [@constants_fixture_path, ConstantSpecs::ParentA::CS_CONST20_LINE]
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST5) == nil
+    end
+
+    it "returns nil if the constant is defined in the receiver's superclass and the inherit flag is false" do
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST4, false).should == nil
+    end
+
+    it "searches into the receiver superclasses if the inherit flag is true" do
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST4, true).should == [@constants_fixture_path, ConstantSpecs::ParentA::CS_CONST4_LINE]
+    end
+
+    it "returns nil when the receiver is a Module, the constant is defined at toplevel and the inherit flag is false" do
+      ConstantSpecs::ModuleA.const_source_location(:CS_CONST1, false).should == nil
+    end
+
+    it "returns nil when the receiver is a Class, the constant is defined at toplevel and the inherit flag is false" do
+      ConstantSpecs::ContainerA::ChildA.const_source_location(:CS_CONST1, false).should == nil
+    end
+
+    it "accepts a toplevel scope qualifier" do
+      ConstantSpecs.const_source_location("::CS_CONST1").should == [@constants_fixture_path, CS_CONST1_LINE]
+    end
+
+    it "accepts a scoped constant name" do
+      ConstantSpecs.const_source_location("ClassA::CS_CONST10").should == [@constants_fixture_path, ConstantSpecs::ClassA::CS_CONST10_LINE]
+    end
+
+    it "raises a NameError if the name includes two successive scope separators" do
+      -> { ConstantSpecs.const_source_location("ClassA::::CS_CONST10") }.should raise_error(NameError)
+    end
+
+    it "raises a NameError if only '::' is passed" do
+      -> { ConstantSpecs.const_source_location("::") }.should raise_error(NameError)
+    end
+
+    it "raises a NameError if a Symbol has a toplevel scope qualifier" do
+      -> { ConstantSpecs.const_source_location(:'::CS_CONST1') }.should raise_error(NameError)
+    end
+
+    it "raises a NameError if a Symbol is a scoped constant name" do
+      -> { ConstantSpecs.const_source_location(:'ClassA::CS_CONST10') }.should raise_error(NameError)
+    end
+
+    it "does search private constants path" do
+       ConstantSpecs.const_source_location(:CS_PRIVATE).should == [@constants_fixture_path, ConstantSpecs::CS_PRIVATE_LINE]
+    end
+
+    context 'autoload' do
+      before :all do
+        ConstantSpecs.autoload :CSL_CONST1, "#{__dir__}/notexisting.rb"
+        @line = __LINE__ - 1
+      end
+
+      it 'returns the autoload location while not resolved' do
+        ConstantSpecs.const_source_location('CSL_CONST1').should == [__FILE__, @line]
+      end
+
+      it 'returns where the constant was resolved when resolved' do
+        file = fixture(__FILE__, 'autoload_location.rb')
+        ConstantSpecs.autoload :CONST_LOCATION, file
+        line = ConstantSpecs::CONST_LOCATION
+        ConstantSpecs.const_source_location('CONST_LOCATION').should == [file, line]
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/module/constants_spec.rb b/spec/ruby/core/module/constants_spec.rb
index 4538e828dd..beb25c6eaa 100644
--- a/spec/ruby/core/module/constants_spec.rb
+++ b/spec/ruby/core/module/constants_spec.rb
@@ -43,31 +43,31 @@ end
 describe "Module#constants" do
   it "returns an array of Symbol names of all constants defined in the module and all included modules" do
     ConstantSpecs::ContainerA.constants.sort.should == [
-      :CS_CONST10, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
+      :CS_CONST10, :CS_CONST10_LINE, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
     ]
   end
 
   it "returns all constants including inherited when passed true" do
     ConstantSpecs::ContainerA.constants(true).sort.should == [
-      :CS_CONST10, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
+      :CS_CONST10, :CS_CONST10_LINE, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
     ]
   end
 
   it "returns all constants including inherited when passed some object" do
     ConstantSpecs::ContainerA.constants(Object.new).sort.should == [
-      :CS_CONST10, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
+      :CS_CONST10, :CS_CONST10_LINE, :CS_CONST23, :CS_CONST24, :CS_CONST5, :ChildA
     ]
   end
 
   it "doesn't returns inherited constants when passed false" do
     ConstantSpecs::ContainerA.constants(false).sort.should == [
-      :CS_CONST10, :CS_CONST23, :CS_CONST5, :ChildA
+      :CS_CONST10, :CS_CONST10_LINE, :CS_CONST23, :CS_CONST5, :ChildA
     ]
   end
 
   it "doesn't returns inherited constants when passed nil" do
     ConstantSpecs::ContainerA.constants(nil).sort.should == [
-      :CS_CONST10, :CS_CONST23, :CS_CONST5, :ChildA
+      :CS_CONST10, :CS_CONST10_LINE, :CS_CONST23, :CS_CONST5, :ChildA
     ]
   end
 
diff --git a/spec/ruby/core/module/fixtures/autoload_location.rb b/spec/ruby/core/module/fixtures/autoload_location.rb
new file mode 100644
index 0000000000..318851b2df
--- /dev/null
+++ b/spec/ruby/core/module/fixtures/autoload_location.rb
@@ -0,0 +1,3 @@
+module ConstantSpecs
+  CONST_LOCATION = __LINE__
+end
diff --git a/spec/ruby/core/process/exec_spec.rb b/spec/ruby/core/process/exec_spec.rb
index 0a2c2f77e7..deb8913b6b 100644
--- a/spec/ruby/core/process/exec_spec.rb
+++ b/spec/ruby/core/process/exec_spec.rb
@@ -193,9 +193,11 @@ describe "Process.exec" do
           map_fd_fixture = fixture __FILE__, "map_fd.rb"
           cmd = <<-EOC
             f = File.open(#{@name.inspect}, "w+")
-            child_fd = f.fileno + 1
-            File.open(#{@child_fd_file.inspect}, "w") { |io| io.print child_fd }
-            Process.exec "#{ruby_cmd(map_fd_fixture)} \#{child_fd}", { child_fd => f }
+            File.open(#{__FILE__.inspect}, "r") do |io|
+              child_fd = io.fileno
+              File.open(#{@child_fd_file.inspect}, "w") { |io| io.print child_fd }
+              Process.exec "#{ruby_cmd(map_fd_fixture)} \#{child_fd}", { child_fd => f }
+            end
             EOC
 
           ruby_exe(cmd, escape: true)
diff --git a/spec/ruby/core/process/spawn_spec.rb b/spec/ruby/core/process/spawn_spec.rb
index a068e05571..40509471ef 100644
--- a/spec/ruby/core/process/spawn_spec.rb
+++ b/spec/ruby/core/process/spawn_spec.rb
@@ -706,13 +706,15 @@ describe "Process.spawn" do
       end
 
       it "maps the key to a file descriptor in the child that inherits the file descriptor from the parent specified by the value" do
-        child_fd = find_unused_fd
-        args = ruby_cmd(fixture(__FILE__, "map_fd.rb"), args: [child_fd.to_s])
-        pid = Process.spawn(*args, { child_fd => @io })
-        Process.waitpid pid
-        @io.rewind
-
-        @io.read.should == "writing to fd: #{child_fd}"
+        File.open(__FILE__, "r") do |f|
+          child_fd = f.fileno
+          args = ruby_cmd(fixture(__FILE__, "map_fd.rb"), args: [child_fd.to_s])
+          pid = Process.spawn(*args, { child_fd => @io })
+          Process.waitpid pid
+          @io.rewind
+
+          @io.read.should == "writing to fd: #{child_fd}"
+        end
       end
     end
   end
diff --git a/spec/ruby/core/range/minmax_spec.rb b/spec/ruby/core/range/minmax_spec.rb
new file mode 100644
index 0000000000..c3973af13f
--- /dev/null
+++ b/spec/ruby/core/range/minmax_spec.rb
@@ -0,0 +1,170 @@
+require_relative '../../spec_helper'
+
+# These specs use Range.new instead of the literal notation so they parse fine on Ruby < 2.6
+describe 'Range#minmax' do
+  before(:each) do
+    @x = mock('x')
+    @y = mock('y')
+
+    @x.should_receive(:<=>).with(@y).any_number_of_times.and_return(-1) # x < y
+    @x.should_receive(:<=>).with(@x).any_number_of_times.and_return(0) # x == x
+    @y.should_receive(:<=>).with(@x).any_number_of_times.and_return(1) # y > x
+    @y.should_receive(:<=>).with(@y).any_number_of_times.and_return(0) # y == y
+  end
+
+  describe 'on an inclusive range' do
+    ruby_version_is '2.6'...'2.7' do
+      it 'should try to iterate endlessly on an endless range' do
+        @x.should_receive(:succ).once.and_return(@y)
+        range = Range.new(@x, nil)
+
+        -> { range.minmax }.should raise_error(NoMethodError, /^undefined method `succ' for/)
+      end
+    end
+
+    ruby_version_is '2.7' do
+      it 'should raise RangeError on an endless range without iterating the range' do
+        @x.should_not_receive(:succ)
+
+        range = Range.new(@x, nil)
+
+        -> { range.minmax }.should raise_error(RangeError, 'cannot get the maximum of endless range')
+      end
+
+      it 'raises RangeError or ArgumentError on a beginless range' do
+        range = Range.new(nil, @x)
+
+        -> { range.minmax }.should raise_error(StandardError) { |e|
+          if RangeError === e
+            # error from #min
+            -> { raise e }.should raise_error(RangeError, 'cannot get the minimum of beginless range')
+          else
+            # error from #max
+            -> { raise e }.should raise_error(ArgumentError, 'comparison of NilClass with MockObject failed')
+          end
+        }
+      end
+    end
+
+    it 'should return begining of range if beginning and end are equal without iterating the range' do
+      @x.should_not_receive(:succ)
+
+      (@x..@x).minmax.should == [@x, @x]
+    end
+
+    it 'should return nil pair if beginning is greater than end without iterating the range' do
+      @y.should_not_receive(:succ)
+
+      (@y..@x).minmax.should == [nil, nil]
+    end
+
+    ruby_version_is ''...'2.7' do
+      it 'should return the minimum and maximum values for a non-numeric range by iterating the range' do
+        @x.should_receive(:succ).once.and_return(@y)
+
+        (@x..@y).minmax.should == [@x, @y]
+      end
+    end
+
+    ruby_version_is '2.7' do
+      it 'should return the minimum and maximum values for a non-numeric range without iterating the range' do
+        @x.should_not_receive(:succ)
+
+        (@x..@y).minmax.should == [@x, @y]
+      end
+    end
+
+    it 'should return the minimum and maximum values for a numeric range' do
+      (1..3).minmax.should == [1, 3]
+    end
+
+    ruby_version_is '2.7' do
+      it 'should return the minimum and maximum values for a numeric range without iterating the range' do
+        # We cannot set expectations on integers,
+        # so we "prevent" iteration by picking a value that would iterate until the spec times out.
+        range_end = Float::INFINITY
+
+        (1..range_end).minmax.should == [1, range_end]
+      end
+    end
+
+    it 'should return the minimum and maximum values according to the provided block by iterating the range' do
+      @x.should_receive(:succ).once.and_return(@y)
+
+      (@x..@y).minmax { |x, y| - (x <=> y) }.should == [@y, @x]
+    end
+  end
+
+  describe 'on an exclusive range' do
+    ruby_version_is '2.6'...'2.7' do
+      # Endless ranges introduced in 2.6
+      it 'should try to iterate endlessly on an endless range' do
+        @x.should_receive(:succ).once.and_return(@y)
+        range = Range.new(@x, nil, true)
+
+        -> { range.minmax }.should raise_error(NoMethodError, /^undefined method `succ' for/)
+      end
+    end
+
+    ruby_version_is '2.7' do
+      it 'should raise RangeError on an endless range' do
+        @x.should_not_receive(:succ)
+        range = Range.new(@x, nil, true)
+
+        -> { range.minmax }.should raise_error(RangeError, 'cannot get the maximum of endless range')
+      end
+
+      it 'should raise RangeError on a beginless range' do
+        range = Range.new(nil, @x, true)
+
+        -> { range.minmax }.should raise_error(RangeError,
+          /cannot get the maximum of beginless range with custom comparison method|cannot get the minimum of beginless range/)
+      end
+    end
+
+    ruby_bug "#17014", "2.7.0"..."2.8" do
+      it 'should return nil pair if beginning and end are equal without iterating the range' do
+        @x.should_not_receive(:succ)
+
+        (@x...@x).minmax.should == [nil, nil]
+      end
+
+      it 'should return nil pair if beginning is greater than end without iterating the range' do
+        @y.should_not_receive(:succ)
+
+        (@y...@x).minmax.should == [nil, nil]
+      end
+
+      it 'should return the minimum and maximum values for a non-numeric range by iterating the range' do
+        @x.should_receive(:succ).once.and_return(@y)
+
+        (@x...@y).minmax.should == [@x, @x]
+      end
+    end
+
+    it 'should return the minimum and maximum values for a numeric range' do
+      (1...3).minmax.should == [1, 2]
+    end
+
+    ruby_version_is '2.7' do
+      it 'should return the minimum and maximum values for a numeric range without iterating the range' do
+        # We cannot set expectations on integers,
+        # so we "prevent" iteration by picking a value that would iterate until the spec times out.
+        range_end = bignum_value
+
+        (1...range_end).minmax.should == [1, range_end - 1]
+      end
+
+      it 'raises TypeError if the end value is not an integer' do
+        range = (0...Float::INFINITY)
+        -> { range.minmax }.should raise_error(TypeError, 'cannot exclude non Integer end value')
+      end
+    end
+
+    it 'should return the minimum and maximum values according to the provided block by iterating the range' do
+      @x.should_receive(:succ).once.and_return(@y)
+
+      (@x...@y).minmax { |x, y| - (x <=> y) }.should == [@x, @x]
+    end
+  end
+end
diff --git a/spec/ruby/core/string/chomp_spec.rb b/spec/ruby/core/string/chomp_spec.rb
index b3f64d7118..7a1118d534 100644
--- a/spec/ruby/core/string/chomp_spec.rb
+++ b/spec/ruby/core/string/chomp_spec.rb
@@ -55,6 +55,10 @@ describe "String#chomp" do
       $/ = "cdef"
       "abcdef".chomp.should == "ab"
     end
+
+    it "removes one trailing newline for string with invalid encoding" do
+      "\xa0\xa1\n".chomp.should == "\xa0\xa1"
+    end
   end
 
   describe "when passed nil" do
@@ -108,6 +112,10 @@ describe "String#chomp" do
     it "returns an empty String when self is empty" do
       "".chomp("").should == ""
     end
+
+    it "removes one trailing newline for string with invalid encoding" do
+      "\xa0\xa1\n".chomp("").should == "\xa0\xa1"
+    end
   end
 
   describe "when passed '\\n'" do
diff --git a/spec/ruby/core/thread/list_spec.rb b/spec/ruby/core/thread/list_spec.rb
index a0bf831856..3c6f70c13e 100644
--- a/spec/ruby/core/thread/list_spec.rb
+++ b/spec/ruby/core/thread/list_spec.rb
@@ -43,11 +43,11 @@ describe "Thread.list" do
       end
     end
 
-    while spawner.alive?
+    begin
       Thread.list.each { |th|
         th.should be_kind_of(Thread)
       }
-    end
+    end while spawner.alive?
 
     threads = spawner.value
     threads.each(&:join)