1 files changed, 100 insertions, 0 deletions

diff --git a/spec/ruby/core/string/ljust_spec.rb b/spec/ruby/core/string/ljust_spec.rb
new file mode 100644
index 0000000000..0b2aab2638
--- /dev/null
+++ b/spec/ruby/core/string/ljust_spec.rb
@@ -0,0 +1,100 @@
+# -*- encoding: utf-8 -*-
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "String#ljust with length, padding" do
+  it "returns a new string of specified length with self left justified and padded with padstr" do
+    "hello".ljust(20, '1234').should == "hello123412341234123"
+
+    "".ljust(1, "abcd").should == "a"
+    "".ljust(2, "abcd").should == "ab"
+    "".ljust(3, "abcd").should == "abc"
+    "".ljust(4, "abcd").should == "abcd"
+    "".ljust(6, "abcd").should == "abcdab"
+
+    "OK".ljust(3, "abcd").should == "OKa"
+    "OK".ljust(4, "abcd").should == "OKab"
+    "OK".ljust(6, "abcd").should == "OKabcd"
+    "OK".ljust(8, "abcd").should == "OKabcdab"
+  end
+
+  it "pads with whitespace if no padstr is given" do
+    "hello".ljust(20).should == "hello               "
+  end
+
+  it "returns self if it's longer than or as long as the specified length" do
+    "".ljust(0).should == ""
+    "".ljust(-1).should == ""
+    "hello".ljust(4).should == "hello"
+    "hello".ljust(-1).should == "hello"
+    "this".ljust(3).should == "this"
+    "radiology".ljust(8, '-').should == "radiology"
+  end
+
+  it "tries to convert length to an integer using to_int" do
+    "^".ljust(3.8, "_^").should == "^_^"
+
+    obj = mock('3')
+    obj.should_receive(:to_int).and_return(3)
+
+    "o".ljust(obj, "_o").should == "o_o"
+  end
+
+  it "raises a TypeError when length can't be converted to an integer" do
+    -> { "hello".ljust("x")       }.should.raise(TypeError)
+    -> { "hello".ljust("x", "y")  }.should.raise(TypeError)
+    -> { "hello".ljust([])        }.should.raise(TypeError)
+    -> { "hello".ljust(mock('x')) }.should.raise(TypeError)
+  end
+
+  it "tries to convert padstr to a string using to_str" do
+    padstr = mock('123')
+    padstr.should_receive(:to_str).and_return("123")
+
+    "hello".ljust(10, padstr).should == "hello12312"
+  end
+
+  it "raises a TypeError when padstr can't be converted" do
+    -> { "hello".ljust(20, [])        }.should.raise(TypeError)
+    -> { "hello".ljust(20, Object.new)}.should.raise(TypeError)
+    -> { "hello".ljust(20, mock('x')) }.should.raise(TypeError)
+  end
+
+  it "raises an ArgumentError when padstr is empty" do
+    -> { "hello".ljust(10, '') }.should.raise(ArgumentError)
+  end
+
+  it "returns String instances when called on subclasses" do
+    StringSpecs::MyString.new("").ljust(10).should.instance_of?(String)
+    StringSpecs::MyString.new("foo").ljust(10).should.instance_of?(String)
+    StringSpecs::MyString.new("foo").ljust(10, StringSpecs::MyString.new("x")).should.instance_of?(String)
+
+    "".ljust(10, StringSpecs::MyString.new("x")).should.instance_of?(String)
+    "foo".ljust(10, StringSpecs::MyString.new("x")).should.instance_of?(String)
+  end
+
+  describe "with width" do
+    it "returns a String in the same encoding as the original" do
+      str = "abc".dup.force_encoding Encoding::IBM437
+      result = str.ljust 5
+      result.should == "abc  "
+      result.encoding.should.equal?(Encoding::IBM437)
+    end
+  end
+
+  describe "with width, pattern" do
+    it "returns a String in the compatible encoding" do
+      str = "abc".dup.force_encoding Encoding::IBM437
+      result = str.ljust 5, "あ"
+      result.should == "abcああ"
+      result.encoding.should.equal?(Encoding::UTF_8)
+    end
+
+    it "raises an Encoding::CompatibilityError if the encodings are incompatible" do
+      pat = "ア".encode Encoding::EUC_JP
+      -> do
+        "あれ".ljust 5, pat
+      end.should.raise(Encoding::CompatibilityError)
+    end
+  end
+end