Refactor entire codebase and rewrite documentation

Tests/DataLiteCoreTests/Enums/SQLiteValueTests.swift

@@ -0,0 +1,49 @@
+import Foundation
+import Testing
+import DataLiteCore
+
+struct SQLiteValueTests {
+    @Test(arguments: [1, 42, 1234])
+    func testSQLiteIntValue(_ value: Int64) {
+        let value = SQLiteValue.int(value)
+        #expect(value.sqliteLiteral == "\(value)")
+        #expect(value.description == value.sqliteLiteral)
+    }
+    
+    @Test(arguments: [12, 0.5, 123.99])
+    func testSQLiteRealValue(_ value: Double) {
+        let value = SQLiteValue.real(value)
+        #expect(value.sqliteLiteral == "\(value)")
+        #expect(value.description == value.sqliteLiteral)
+    }
+    
+    @Test(arguments: [
+        ("", "''"),
+        ("'hello'", "'''hello'''"),
+        ("hello", "'hello'"),
+        ("O'Reilly", "'O''Reilly'"),
+        ("It's John's \"book\"", "'It''s John''s \"book\"'")
+    ])
+    func testSQLiteTextValue(_ value: String, _ expected: String) {
+        let value = SQLiteValue.text(value)
+        #expect(value.sqliteLiteral == expected)
+        #expect(value.description == value.sqliteLiteral)
+    }
+    
+    @Test(arguments: [
+        (Data(), "X''"),
+        (Data([0x00]), "X'00'"),
+        (Data([0x00, 0xAB, 0xCD]), "X'00ABCD'")
+    ])
+    func testSQLiteBlobValue(_ value: Data, _ expected: String) {
+        let value = SQLiteValue.blob(value)
+        #expect(value.sqliteLiteral == expected)
+        #expect(value.description == value.sqliteLiteral)
+    }
+    
+    @Test func testSQLiteNullValue() {
+        let value = SQLiteValue.null
+        #expect(value.sqliteLiteral == "NULL")
+        #expect(value.description == value.sqliteLiteral)
+    }
+}