1 files changed, 65 insertions, 0 deletions
diff --git a/spec/ruby/core/matchdata/deconstruct_keys_spec.rb b/spec/ruby/core/matchdata/deconstruct_keys_spec.rb
new file mode 100644
index 0000000000..5b68f886c7
--- /dev/null
+++ b/spec/ruby/core/matchdata/deconstruct_keys_spec.rb
@@ -0,0 +1,65 @@
+require_relative '../../spec_helper'
+
+describe "MatchData#deconstruct_keys" do
+  ruby_version_is "3.2" do
+    it "returns whole hash for nil as an argument" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      m.deconstruct_keys(nil).should == { f: "foo", b: "bar" }
+    end
+
+    it "returns only specified keys" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      m.deconstruct_keys([:f]).should == { f: "foo" }
+    end
+
+    it "requires one argument" do
+      m = /l/.match("l")
+
+      -> {
+        m.deconstruct_keys
+      }.should raise_error(ArgumentError, "wrong number of arguments (given 0, expected 1)")
+    end
+
+    it "it raises error when argument is neither nil nor array" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      -> { m.deconstruct_keys(1) }.should raise_error(TypeError, "wrong argument type Integer (expected Array)")
+      -> { m.deconstruct_keys("asd") }.should raise_error(TypeError, "wrong argument type String (expected Array)")
+      -> { m.deconstruct_keys(:x) }.should raise_error(TypeError, "wrong argument type Symbol (expected Array)")
+      -> { m.deconstruct_keys({}) }.should raise_error(TypeError, "wrong argument type Hash (expected Array)")
+    end
+
+    it "returns {} when passed []" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      m.deconstruct_keys([]).should == {}
+    end
+
+    it "does not accept non-Symbol keys" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+
+      -> {
+        m.deconstruct_keys(['year', :foo])
+      }.should raise_error(TypeError, "wrong argument type String (expected Symbol)")
+    end
+
+    it "process keys till the first non-existing one" do
+      m = /(?<f>foo)(?<b>bar)(?<c>baz)/.match("foobarbaz")
+
+      m.deconstruct_keys([:f, :a, :b]).should == { f: "foo" }
+    end
+
+    it "returns {} when there are no named captured groups at all" do
+      m = /foo.+/.match("foobar")
+
+      m.deconstruct_keys(nil).should == {}
+    end
+
+    it "returns {} when passed more keys than named captured groups" do
+      m = /(?<f>foo)(?<b>bar)/.match("foobar")
+      m.deconstruct_keys([:f, :b, :c]).should == {}
+    end
+  end
+end