up-fs-hex: Update getStorageSize as private variable will always contain a value.

Author: microbit-carlos

src/__tests__/micropython-fs-hex.spec.ts

@@ -659,6 +659,25 @@ describe('Test MicroPython hex filesystem size.', () => {
     // Calculated by hand from the uPyHexFile v1.0.1 release.
     expect(totalSize).toEqual(27 * 1024);
   });
+
+  it('Get available fs space when manually set in constructor.', () => {
+    const micropythonFs = new MicropythonFsHex({ maxFsSize: 1024 });
+
+    const totalSize = micropythonFs.getStorageSize();
+
+    expect(totalSize).toEqual(1024);
+  });
+
+  it('Get available fs space when both hex and constructor value are provided.', () => {
+    const micropythonFs = new MicropythonFsHex({
+      uPyHex: uPyHexFile,
+      maxFsSize: 1024,
+    });
+
+    const totalSize = micropythonFs.getStorageSize();
+
+    expect(totalSize).toEqual(1024);
+  });
 });
 
 /*

src/micropython-fs-hex.ts

@@ -202,15 +202,13 @@ export class MicropythonFsHex implements FsInterface {
   }
 
   /**
-   * Calculate the MicroPython filesystem total size.
-   * If an max storage size limit has been set, it returns this number.
+   * The available filesystem total size either calculated by the MicroPython
+   * hex or the max storage size limit has been set.
    *
    * @returns Size of the filesystem in bytes.
    */
   getStorageSize(): number {
-    return this._storageSize
-      ? this._storageSize
-      : getIntelHexFsSize(this._intelHex);
+    return this._storageSize;
   }
 
   /**