1 files changed, 146 insertions, 0 deletions
diff --git a/spec/rubyspec/library/matrix/find_index_spec.rb b/spec/rubyspec/library/matrix/find_index_spec.rb
new file mode 100644
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+++ b/spec/rubyspec/library/matrix/find_index_spec.rb
@@ -0,0 +1,146 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix#find_index without any argument" do
+  before :all do
+    @m = Matrix[ [1, 2, 3, 4], [5, 6, 7, 8] ]
+  end
+
+  it "returns an Enumerator when called without a block" do
+    enum = @m.find_index
+    enum.should be_an_instance_of(Enumerator)
+    enum.to_a.should == [1, 2, 3, 4, 5, 6, 7, 8]
+  end
+
+  it "returns nil if the block is always false" do
+    @m.find_index{false}.should be_nil
+  end
+
+  it "returns the first index for which the block is true" do
+    @m.find_index{|x| x >= 3}.should == [0, 2]
+  end
+end
+
+describe "Matrix#find_index with a subselection argument" do
+  before :all do
+    @tests = [
+    [  Matrix[ [1, 2, 3, 4], [5, 6, 7, 8] ], {
+        diagonal: [1, 6]               ,
+        off_diagonal: [2, 3, 4, 5, 7, 8],
+        lower: [1, 5, 6]               ,
+        strict_lower: [5]              ,
+        strict_upper: [2, 3, 4, 7, 8]  ,
+        upper: [1, 2, 3, 4, 6, 7, 8]   ,
+      }
+    ],
+    [  Matrix[ [1, 2], [3, 4], [5, 6], [7, 8] ], {
+        diagonal: [1, 4]               ,
+        off_diagonal: [2, 3, 5, 6, 7, 8],
+        lower: [1, 3, 4, 5, 6, 7, 8]   ,
+        strict_lower: [3, 5, 6, 7, 8]  ,
+        strict_upper: [2]              ,
+        upper: [1, 2, 4]               ,
+      }
+    ]]
+  end
+
+  describe "and no generic argument" do
+    it "returns an Enumerator when called without a block" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          matrix.find_index(selector).should be_an_instance_of(Enumerator)
+        end
+      end
+    end
+
+    it "yields the rights elements" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          matrix.find_index(selector).to_a.should == result
+        end
+      end
+    end
+
+    it "returns the first index for which the block returns true" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          cnt = result.size.div 2
+          which = result[cnt]
+          idx = matrix.find_index(selector){|x| cnt -= 1; x == which}
+          matrix[*idx].should == which
+          cnt.should == -1
+        end
+      end
+    end
+
+    it "returns nil if the block is always false" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          matrix.find_index(selector){ nil }.should == nil
+        end
+      end
+    end
+
+  end
+
+  describe "and a generic argument" do
+    it "ignores a block" do
+      @m.find_index(42, :diagonal){raise "oups"}.should == nil
+    end
+
+    it "returns the index of the requested value" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          cnt = result.size / 2
+          which = result[cnt]
+          idx = matrix.find_index(which, selector)
+          matrix[*idx].should == which
+        end
+      end
+    end
+
+    it "returns nil if the requested value is not found" do
+      @tests.each do |matrix, h|
+        h.each do |selector, result|
+          matrix.find_index(42, selector).should == nil
+        end
+      end
+    end
+  end
+
+end
+
+describe "Matrix#find_index with only a generic argument" do
+  before :all do
+    @m = Matrix[ [1, 2, 3, 4], [1, 2, 3, 4] ]
+  end
+
+  it "returns nil if the value is not found" do
+    @m.find_index(42).should be_nil
+  end
+
+  it "returns the first index for of the requested value" do
+    @m.find_index(3).should == [0, 2]
+  end
+
+  it "ignores a block" do
+    @m.find_index(4){raise "oups"}.should == [0, 3]
+  end
+end
+
+describe "Matrix#find_index with two arguments" do
+  it "raises an ArgumentError for an unrecognized last argument" do
+    lambda {
+      @m.find_index(1, "all"){}
+    }.should raise_error(ArgumentError)
+    lambda {
+      @m.find_index(1, nil){}
+    }.should raise_error(ArgumentError)
+    lambda {
+      @m.find_index(1, :left){}
+    }.should raise_error(ArgumentError)
+    lambda {
+      @m.find_index(:diagonal, 1){}
+    }.should raise_error(ArgumentError)
+  end
+end