test: add tests for pragma optimize.

test/test_pragmas.rb

@@ -32,5 +32,46 @@ def test_set_boolean_pragma
     ensure
       @db.set_boolean_pragma("read_uncommitted", 0)
     end
+
+    def test_optimize_with_no_args
+      class << @db
+        attr_reader :statements
+
+        def execute sql, bind_vars = [], &block
+          (@statements ||= []) << sql
+          super
+        end
+      end
+
+      @db.optimize
+
+      assert_equal(["PRAGMA optimize"], @db.statements)
+    end
+
+    def test_optimize_with_args
+      class << @db
+        attr_reader :statements
+
+        def execute sql, bind_vars = [], &block
+          (@statements ||= []) << sql
+          super
+        end
+      end
+
+      @db.optimize(Constants::Optimize::DEFAULT)
+      @db.optimize(Constants::Optimize::ANALYZE_TABLES | Constants::Optimize::LIMIT_ANALYZE)
+      @db.optimize(Constants::Optimize::ANALYZE_TABLES | Constants::Optimize::DEBUG)
+      @db.optimize(Constants::Optimize::DEFAULT | Constants::Optimize::CHECK_ALL_TABLES)
+
+      assert_equal(
+        [
+          "PRAGMA optimize=18",
+          "PRAGMA optimize=18",
+          "PRAGMA optimize=3",
+          "PRAGMA optimize=65554"
+        ],
+        @db.statements
+      )
+    end
   end
 end