fix generation for string literal

simulator/generation/expr.rs

@@ -256,7 +256,7 @@ impl ArbitraryFrom<&SimulatorEnv> for ast::Literal {
                         rng.gen_range(-1e10..1e10).to_string()
                     }
                 }),
-                1 => ast::Literal::String(gen_random_text(rng)),
+                1 => ast::Literal::String(format!("'{}'", gen_random_text(rng))),
                 2 => ast::Literal::Blob(hex::encode(gen_random_text(rng).as_bytes().to_vec())),
                 // TODO: skip Keyword
                 3 => continue,

simulator/model/table.rs

@@ -256,7 +256,7 @@ impl From<Value> for ast::Literal {
             Value::Null => Self::Null,
             Value::Integer(i) => Self::Numeric(i.to_string()),
             Value::Float(f) => Self::Numeric(f.to_string()),
-            Value::Text(string) => Self::String(string),
+            Value::Text(string) => Self::String(format!("'{}'", string)),
             Value::Blob(blob) => Self::Blob(hex::encode(blob)),
         }
     }