test: add tests for pragma optimize.

test/test_pragmas.rb

@@ -2,9 +2,27 @@
 
 module SQLite3
   class TestPragmas < SQLite3::TestCase
+    class DatabaseTracker < SQLite3::Database
+      attr_reader :test_statements
+
+      def initialize(...)
+        @test_statements = []
+        super
+      end
+
+      def execute(sql, bind_vars = [], &block)
+        @test_statements << sql
+        super
+      end
+    end
+
     def setup
       super
-      @db = SQLite3::Database.new(":memory:")
+      @db = DatabaseTracker.new(":memory:")
+    end
+
+    def teardown
+      @db.close
     end
 
     def test_pragma_errors
@@ -32,5 +50,28 @@ def test_set_boolean_pragma
     ensure
       @db.set_boolean_pragma("read_uncommitted", 0)
     end
+
+    def test_optimize_with_no_args
+      @db.optimize
+
+      assert_equal(["PRAGMA optimize"], @db.test_statements)
+    end
+
+    def test_optimize_with_args
+      @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.test_statements
+      )
+    end
   end
 end