how to check the violation of the foreign key Sqlite

I have two Tables, the first one is :

CREATE TABLE `Material_Type` (
    `Material_Type_ID`  integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    `Material_Type` nvarchar NOT NULL,
    `Material_Type_Description` nvarchar
);

and the second Table is :

CREATE TABLE `Material` (
    `Material_ID`   integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    `Material_Name` nvarchar NOT NULL,
    `Material_Description`  nvarchar,
    `Material_Picture`  BLOB,
    `Material_Type_ID`  integer NOT NULL,
    FOREIGN KEY(`Material_Type_ID`) REFERENCES `Material_Type`(`Material_Type_ID`)
);

My problem is that when I add Insert a Material_Type_ID to the Material Table, Sqlite doesn't check the violation of the foreign key. for example I have

Material_Type_ID Material_Type Material_Descriptio 1 first material first description 2 2nd Mmaterial 2nd description

when I insert 20 in Material(Material_Type_ID) that doesn't generate any error. I set PRAGMA foreign_keys = OFF;but nothing changed can you help me to set this verification please ? Thanks in advance