1 files changed, 48 insertions, 45 deletions
diff --git a/spec/ruby/library/matrix/exponent_spec.rb b/spec/ruby/library/matrix/exponent_spec.rb
index b76e18b4cd..5262627fd5 100644
--- a/spec/ruby/library/matrix/exponent_spec.rb
+++ b/spec/ruby/library/matrix/exponent_spec.rb
@@ -1,64 +1,67 @@
 require_relative '../../spec_helper'
-require_relative 'fixtures/classes'
-require 'matrix'
 
-describe "Matrix#**" do
+ruby_version_is ""..."3.1" do
+  require_relative 'fixtures/classes'
+  require 'matrix'
 
-  describe "given an integer _n_" do
-    it "multiples the Matrix by itself _n_ times" do
-      m = Matrix[ [7,6], [3,9] ]
-      (m ** 1).should == m
-      (m ** 2).should == Matrix[ [67, 96], [48,99] ]
-      (m ** 2).should == m * m
-      (m ** 3).should == m * m * m
-      (m ** 4).should == m * m * m * m
-      (m ** 5).should == m * m * m * m * m
-    end
-
-    it "raises a ErrDimensionMismatch for non square matrices" do
-      m = Matrix[ [1, 1], [1, 2], [2, 3]]
-      -> { m ** 3 }.should raise_error(Matrix::ErrDimensionMismatch)
-      -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch)
-    end
+  describe "Matrix#**" do
 
-    describe "that is < 0" do
-      it "returns the inverse of **(-n)" do
-        m = Matrix[ [1, 1], [1, 2] ]
-        (m ** -2).should == Matrix[ [5, -3], [-3, 2]]
-        (m ** -4).should == (m.inverse ** 4)
+    describe "given an integer _n_" do
+      it "multiples the Matrix by itself _n_ times" do
+        m = Matrix[ [7,6], [3,9] ]
+        (m ** 1).should == m
+        (m ** 2).should == Matrix[ [67, 96], [48,99] ]
+        (m ** 2).should == m * m
+        (m ** 3).should == m * m * m
+        (m ** 4).should == m * m * m * m
+        (m ** 5).should == m * m * m * m * m
       end
 
-      it "raises a ErrNotRegular for irregular matrices" do
-        m = Matrix[ [1, 1], [1, 1] ]
-        -> { m ** -2 }.should raise_error(Matrix::ErrNotRegular)
+      it "raises a ErrDimensionMismatch for non square matrices" do
+        m = Matrix[ [1, 1], [1, 2], [2, 3]]
+        -> { m ** 3 }.should raise_error(Matrix::ErrDimensionMismatch)
+        -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch)
       end
-    end
 
-    ruby_version_is '3.1.0' do # https://bugs.ruby-lang.org/issues/17521
-      describe "that is 0" do
-        it "returns the identity for square matrices" do
+      describe "that is < 0" do
+        it "returns the inverse of **(-n)" do
+          m = Matrix[ [1, 1], [1, 2] ]
+          (m ** -2).should == Matrix[ [5, -3], [-3, 2]]
+          (m ** -4).should == (m.inverse ** 4)
+        end
+
+        it "raises a ErrNotRegular for irregular matrices" do
           m = Matrix[ [1, 1], [1, 1] ]
-          (m ** 0).should == Matrix.identity(2)
+          -> { m ** -2 }.should raise_error(Matrix::ErrNotRegular)
         end
+      end
+
+      ruby_version_is '3.1.0' do # https://bugs.ruby-lang.org/issues/17521
+        describe "that is 0" do
+          it "returns the identity for square matrices" do
+            m = Matrix[ [1, 1], [1, 1] ]
+            (m ** 0).should == Matrix.identity(2)
+          end
 
-        it "raises an ErrDimensionMismatch for non-square matrices" do
-          m = Matrix[ [1, 1] ]
-          -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch)
+          it "raises an ErrDimensionMismatch for non-square matrices" do
+            m = Matrix[ [1, 1] ]
+            -> { m ** 0 }.should raise_error(Matrix::ErrDimensionMismatch)
+          end
         end
       end
     end
-  end
 
-  it "returns the power for non integer powers" do
-    a = Matrix[[5, 4], [4, 5]]
-    ((a ** 0.5) ** 2).round(8).should == a
-    a = Matrix[[7, 10], [15, 22]]
-    ((a ** 0.25) ** 4).round(8).should == a
-  end
+    it "returns the power for non integer powers" do
+      a = Matrix[[5, 4], [4, 5]]
+      ((a ** 0.5) ** 2).round(8).should == a
+      a = Matrix[[7, 10], [15, 22]]
+      ((a ** 0.25) ** 4).round(8).should == a
+    end
 
-  describe "for a subclass of Matrix" do
-    it "returns an instance of that subclass" do
-      (MatrixSub.ins ** 1).should be_an_instance_of(MatrixSub)
+    describe "for a subclass of Matrix" do
+      it "returns an instance of that subclass" do
+        (MatrixSub.ins ** 1).should be_an_instance_of(MatrixSub)
+      end
     end
   end
 end