1 files changed, 161 insertions, 0 deletions
diff --git a/spec/ruby/core/array/shared/join.rb b/spec/ruby/core/array/shared/join.rb
new file mode 100644
index 0000000000..fa66588b47
--- /dev/null
+++ b/spec/ruby/core/array/shared/join.rb
@@ -0,0 +1,161 @@
+require File.expand_path('../../fixtures/classes', __FILE__)
+require File.expand_path('../../fixtures/encoded_strings', __FILE__)
+
+describe :array_join_with_default_separator, shared: true do
+  before :each do
+    @separator = $,
+  end
+
+  after :each do
+    $, = @separator
+  end
+
+  it "returns an empty string if the Array is empty" do
+    [].send(@method).should == ''
+  end
+
+  it "returns a US-ASCII string for an empty Array" do
+    [].send(@method).encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns a string formed by concatenating each String element separated by $," do
+    $, = " | "
+    ["1", "2", "3"].send(@method).should == "1 | 2 | 3"
+  end
+
+  it "attempts coercion via #to_str first" do
+    obj = mock('foo')
+    obj.should_receive(:to_str).any_number_of_times.and_return("foo")
+    [obj].send(@method).should == "foo"
+  end
+
+  it "attempts coercion via #to_ary second" do
+    obj = mock('foo')
+    obj.should_receive(:to_str).any_number_of_times.and_return(nil)
+    obj.should_receive(:to_ary).any_number_of_times.and_return(["foo"])
+    [obj].send(@method).should == "foo"
+  end
+
+  it "attempts coercion via #to_s third" do
+    obj = mock('foo')
+    obj.should_receive(:to_str).any_number_of_times.and_return(nil)
+    obj.should_receive(:to_ary).any_number_of_times.and_return(nil)
+    obj.should_receive(:to_s).any_number_of_times.and_return("foo")
+    [obj].send(@method).should == "foo"
+  end
+
+  it "raises a NoMethodError if an element does not respond to #to_str, #to_ary, or #to_s" do
+    obj = mock('o')
+    class << obj; undef :to_s; end
+    lambda { [1, obj].send(@method) }.should raise_error(NoMethodError)
+  end
+
+  it "raises an ArgumentError when the Array is recursive" do
+    lambda { ArraySpecs.recursive_array.send(@method) }.should raise_error(ArgumentError)
+    lambda { ArraySpecs.head_recursive_array.send(@method) }.should raise_error(ArgumentError)
+    lambda { ArraySpecs.empty_recursive_array.send(@method) }.should raise_error(ArgumentError)
+  end
+
+  it "taints the result if the Array is tainted and non-empty" do
+    [1, 2].taint.send(@method).tainted?.should be_true
+  end
+
+  it "does not taint the result if the Array is tainted but empty" do
+    [].taint.send(@method).tainted?.should be_false
+  end
+
+  it "taints the result if the result of coercing an element is tainted" do
+    s = mock("taint")
+    s.should_receive(:to_s).and_return("str".taint)
+    [s].send(@method).tainted?.should be_true
+  end
+
+  it "untrusts the result if the Array is untrusted and non-empty" do
+    [1, 2].untrust.send(@method).untrusted?.should be_true
+  end
+
+  it "does not untrust the result if the Array is untrusted but empty" do
+    [].untrust.send(@method).untrusted?.should be_false
+  end
+
+  it "untrusts the result if the result of coercing an element is untrusted" do
+    s = mock("untrust")
+    s.should_receive(:to_s).and_return("str".untrust)
+    [s].send(@method).untrusted?.should be_true
+  end
+
+  it "uses the first encoding when other strings are compatible" do
+    ary1 = ArraySpecs.array_with_7bit_utf8_and_usascii_strings
+    ary2 = ArraySpecs.array_with_usascii_and_7bit_utf8_strings
+    ary3 = ArraySpecs.array_with_utf8_and_7bit_ascii8bit_strings
+    ary4 = ArraySpecs.array_with_usascii_and_7bit_ascii8bit_strings
+
+    ary1.send(@method).encoding.should == Encoding::UTF_8
+    ary2.send(@method).encoding.should == Encoding::US_ASCII
+    ary3.send(@method).encoding.should == Encoding::UTF_8
+    ary4.send(@method).encoding.should == Encoding::US_ASCII
+  end
+
+  it "uses the widest common encoding when other strings are incompatible" do
+    ary1 = ArraySpecs.array_with_utf8_and_usascii_strings
+    ary2 = ArraySpecs.array_with_usascii_and_utf8_strings
+
+    ary1.send(@method).encoding.should == Encoding::UTF_8
+    ary2.send(@method).encoding.should == Encoding::UTF_8
+  end
+
+  it "fails for arrays with incompatibly-encoded strings" do
+    ary_utf8_bad_ascii8bit = ArraySpecs.array_with_utf8_and_ascii8bit_strings
+
+    lambda { ary_utf8_bad_ascii8bit.send(@method) }.should raise_error(EncodingError)
+  end
+end
+
+describe :array_join_with_string_separator, shared: true do
+  it "returns a string formed by concatenating each element.to_str separated by separator" do
+    obj = mock('foo')
+    obj.should_receive(:to_str).and_return("foo")
+    [1, 2, 3, 4, obj].send(@method, ' | ').should == '1 | 2 | 3 | 4 | foo'
+  end
+
+  it "uses the same separator with nested arrays" do
+    [1, [2, [3, 4], 5], 6].send(@method, ":").should == "1:2:3:4:5:6"
+    [1, [2, ArraySpecs::MyArray[3, 4], 5], 6].send(@method, ":").should == "1:2:3:4:5:6"
+  end
+
+  describe "with a tainted separator" do
+    before :each do
+      @sep = ":".taint
+    end
+
+    it "does not taint the result if the array is empty" do
+      [].send(@method, @sep).tainted?.should be_false
+    end
+
+    it "does not taint the result if the array has only one element" do
+      [1].send(@method, @sep).tainted?.should be_false
+    end
+
+    it "taints the result if the array has two or more elements" do
+      [1, 2].send(@method, @sep).tainted?.should be_true
+    end
+  end
+
+  describe "with an untrusted separator" do
+    before :each do
+      @sep = ":".untrust
+    end
+
+    it "does not untrust the result if the array is empty" do
+      [].send(@method, @sep).untrusted?.should be_false
+    end
+
+    it "does not untrust the result if the array has only one element" do
+      [1].send(@method, @sep).untrusted?.should be_false
+    end
+
+    it "untrusts the result if the array has two or more elements" do
+      [1, 2].send(@method, @sep).untrusted?.should be_true
+    end
+  end
+end