1 files changed, 87 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/slice_before_spec.rb b/spec/ruby/core/enumerable/slice_before_spec.rb
new file mode 100644
index 0000000000..1594372d32
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+++ b/spec/ruby/core/enumerable/slice_before_spec.rb
@@ -0,0 +1,87 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/enumerable_enumeratorized', __FILE__)
+
+describe "Enumerable#slice_before" do
+  before :each do
+    @enum = EnumerableSpecs::Numerous.new(7,6,5,4,3,2,1)
+  end
+
+  describe "when given an argument and no block" do
+    it "calls === on the argument to determine when to yield" do
+      arg = mock "filter"
+      arg.should_receive(:===).and_return(false, true, false, false, false, true, false)
+      e = @enum.slice_before(arg)
+      e.should be_an_instance_of(Enumerator)
+      e.to_a.should == [[7], [6, 5, 4, 3], [2, 1]]
+    end
+
+    it "doesn't yield an empty array if the filter matches the first entry or the last entry" do
+      arg = mock "filter"
+      arg.should_receive(:===).and_return(true).exactly(7)
+      e = @enum.slice_before(arg)
+      e.to_a.should == [[7], [6], [5], [4], [3], [2], [1]]
+    end
+
+    it "uses standard boolean as a test" do
+      arg = mock "filter"
+      arg.should_receive(:===).and_return(false, :foo, nil, false, false, 42, false)
+      e = @enum.slice_before(arg)
+      e.to_a.should == [[7], [6, 5, 4, 3], [2, 1]]
+    end
+  end
+
+  describe "when given a block" do
+    describe "and no argument" do
+      it "calls the block to determine when to yield" do
+        e = @enum.slice_before{|i| i == 6 || i == 2}
+        e.should be_an_instance_of(Enumerator)
+        e.to_a.should == [[7], [6, 5, 4, 3], [2, 1]]
+      end
+    end
+
+    ruby_version_is ""..."2.3" do
+      describe "and an argument" do
+        it "calls the block with a copy of that argument" do
+          arg = [:foo]
+          first = nil
+          e = @enum.slice_before(arg) do |i, init|
+            init.should == arg
+            init.should_not equal(arg)
+            first = init
+            i == 6 || i == 2
+          end
+          e.should be_an_instance_of(Enumerator)
+          e.to_a.should == [[7], [6, 5, 4, 3], [2, 1]]
+          e = @enum.slice_before(arg) do |i, init|
+            init.should_not equal(first)
+          end
+          e.to_a
+        end
+      end
+    end
+
+    ruby_version_is "2.3" do
+      it "does not accept arguments" do
+        lambda {
+          @enum.slice_before(1) {}
+        }.should raise_error(ArgumentError)
+      end
+    end
+  end
+
+  it "raises an ArgumentError when given an incorrect number of arguments" do
+    lambda { @enum.slice_before("one", "two") }.should raise_error(ArgumentError)
+    lambda { @enum.slice_before }.should raise_error(ArgumentError)
+  end
+
+  describe "when an iterator method yields more than one value" do
+    it "processes all yielded values" do
+      enum = EnumerableSpecs::YieldsMulti.new
+      result = enum.slice_before { |i| i == [3, 4, 5] }.to_a
+      result.should == [[[1, 2]], [[3, 4, 5], [6, 7, 8, 9]]]
+    end
+  end
+
+  it_behaves_like :enumerable_enumeratorized_with_unknown_size, [:slice_before, 3]
+end