Test for out of space error

1 files changed, 34 insertions, 3 deletions

diff --git a/src/database.test.ts b/src/database.test.ts
index ff4b6d8..9f583b9 100644
--- a/src/database.test.ts
+++ b/src/database.test.ts
@@ -1,11 +1,27 @@
 import { Database } from "./database";
+import { NaiveErrorCode } from "./error.model";
+
+const generateString = (sizeBytes: number) =>
+  Array(Math.ceil(sizeBytes)).fill("a");
+
+const maxDbSizeMB = 0.1;
 
 describe("Database module", () => {
   let db: Database;
+
   beforeAll(async () => {
-    db = new Database();
+    db = new Database({
+      logger: console.log,
+      maxDbSizeMB,
+      cachePath: `${__dirname}/db.json`
+    });
     await db.init();
   });
+
+  beforeEach(async () => {
+    await db.flush();
+  });
+
   // Next 2 tests simply look
   // for expections on operations that
   // should be harmless
@@ -14,12 +30,15 @@ describe("Database module", () => {
       formula: "hello world"
     });
   });
+
   test("it should read data", () => {
     return db.read("/hello/world");
   });
+
   test("it should have a string representation", () => {
     expect(db.toString()).not.toHaveLength(0);
   });
+
   test("it should write and then read data", async () => {
     const path = "/hello/world";
     const toWrite = {
@@ -29,6 +48,7 @@ describe("Database module", () => {
     const s = await db.read(path);
     expect(s).toBe(toWrite);
   });
+
   test("it should be empty after a flush", async () => {
     await db.write("/hello/world", {
       my: "object"
@@ -36,13 +56,13 @@ describe("Database module", () => {
     await db.flush();
     expect(db.toString()).toHaveLength(2); // empty object
   });
+
   test("it should read null on an empty node", async () => {
-    await db.flush();
     const s = await db.read("/any/path/should/work");
     expect(s).toBeNull();
   });
+
   test("it should not change on read", async () => {
-    await db.flush();
     await db.write("/my/data/lives/here", {
       whiteHouseDinner: `America's Finest McDouble's`
     });
@@ -51,4 +71,15 @@ describe("Database module", () => {
     expect(s).toBeNull();
     expect(before).toEqual(db.toString());
   });
+
+  test("it should throw an error if max size is exceeded", async () => {
+    try {
+      await db.write("/big/data", {
+        bigObj: generateString(maxDbSizeMB * 1024 ** 2)
+      });
+      throw new Error("Did not throw exception");
+    } catch (e) {
+      expect(e.code).toBe(NaiveErrorCode.OUT_OF_SPACE);
+    }
+  });
 });