1 files changed, 34 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/digits_spec.rb b/spec/ruby/core/integer/digits_spec.rb
new file mode 100644
index 0000000000..3546a654eb
--- /dev/null
+++ b/spec/ruby/core/integer/digits_spec.rb
@@ -0,0 +1,34 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+ruby_version_is "2.4" do
+  describe "Integer#digits" do
+    it "returns an array of place values in base-10 by default" do
+      12345.digits.should == [5,4,3,2,1]
+    end
+
+    it "returns digits by place value of a given radix" do
+      12345.digits(7).should == [4,6,6,0,5]
+    end
+
+    it "converts the radix with #to_int" do
+      12345.digits(mock_int(2)).should == [1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1]
+    end
+
+    it "returns [0] when called on 0, regardless of base" do
+      0.digits.should == [0]
+      0.digits(7).should == [0]
+    end
+
+    it "raises ArgumentError when calling with a radix less than 2" do
+      lambda { 12345.digits(1) }.should raise_error(ArgumentError)
+    end
+
+    it "raises ArgumentError when calling with a negative radix" do
+      lambda { 12345.digits(-2) }.should raise_error(ArgumentError)
+    end
+
+    it "raises Math::DomainError when calling digits on a negative number" do
+      lambda { -12345.digits(7) }.should raise_error(Math::DomainError)
+    end
+  end
+end