Add specs for String#bytesplice

core/string/bytesplice_spec.rb

@@ -0,0 +1,53 @@
+require_relative '../../spec_helper'
+
+describe "String#bytesplice" do
+  ruby_version_is "3.2" do
+    it "accepts index, length and replacement string as arguments and returns replaced string" do
+      "string".bytesplice(0, 3, "xxx").should == "xxxing"
+      "string".bytesplice(-3, 3, "xxx").should == "strxxx"
+      "string".bytesplice(-6, 0, "xxx").should == "xxxstring"
+      "string".bytesplice(3, 0, "xxx").should == "strxxxing"
+    end
+
+    it "accepts range and replacement string as arguments and returns replaced string" do
+      "string".bytesplice(0...3, "xxx").should == "xxxing"
+      "string".bytesplice(-3...3, "xxx").should == "strxxxing"
+      "string".bytesplice(-6...0, "xxx").should == "xxxstring"
+      "string".bytesplice(3..6, "xxx").should == "strxxx"
+    end
+
+    it "replaces whole string with replacement string" do
+      "".bytesplice(0, 0, "xxx").should == "xxx"
+      "".bytesplice(0, 0, "").should == ""
+    end
+
+    it "adjust string length if is not the same as replacement string" do
+      "string".bytesplice(0..-1, "xxx").should == "xxx"
+      "string".bytesplice(0, 6, "xxx").should == "xxx"
+    end
+
+    it "raises IndexError if argument is out of range" do
+      -> {
+        "string".bytesplice(-7, 0, "xxx")
+      }.should raise_error(IndexError, "index -7 out of string")
+    end
+
+    it "raises RangeError if argument is out of range" do
+      -> {
+        "string".bytesplice(-7...-7, "xxx")
+      }.should raise_error(RangeError, "-7...-7 out of range")
+    end
+
+    it "raises IndexError if offset does not land on character boundary" do
+      -> {
+        "こんにちは".bytesplice(1, 0, "xxx")
+      }.should raise_error(IndexError, "offset 1 does not land on character boundary")
+    end
+
+    it "raises TypeError if argument is an Integer instead of Range" do
+      -> {
+        "string".bytesplice(0, "xxx")
+      }.should raise_error(TypeError, "wrong argument type Integer (expected Range)")
+    end
+  end
+end