how to know out camera’s true resolution

we have bought a 13 mp 5 mp cameras smartphone, leagoo alfa 2, from aliexpress, i have tested it, and discovered that it probably has 8 and 2 mp cameras. i have made photos with different image file size, and zoomed photos, and looked, whether detailedness increase with increased files size. you can see my test photos in http://qdb.tmf.org.ru/leagoo%20alfa%202%20cameras%20test/ .

i attach them here too, in blog post, and you can download original photos from the above link:

test of main (rear) camera:
2 mp:
null
5 mp:
null
8 mp:
null
10 mp:
null
12 mp:
null
13 mp:
null
– i see that there are no more new details after 8 mp.

test of front camera:
0.3 mp:
null
1 mp:
null
2 mp:
null
5 mp:
null
– i see that there are no more new details after 2 mp.

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