Make HashOfTag testable without accessing web

[mximp]

We need to be able to populate tags with custom values rather than always download it from the web.

[yegor256]

@mximp it's hard to imagine how we can make it testable alone, since it's used in PullMojo by new. Maybe it's better to introduce new option for PullMojo, something like: -DofflineHash=*.*.*:a1b2c3d. Here, *.*.* means "for any version" and a1b2c3d is the version that it has to return. Then, we just create a fake implementation of HashOfTag, which is created if this offlineHash option is provided, and used instead of a regular HashOfTag. WDYT?

[mximp]

@yegor256 great idea. The only thing I would make this property to contain a list of such mappings: -DofflineHash="0.2.7:abc2sd3,0.2.8:s4se2fe" so that we can simulate any content of tags.txt. Or even make this property to be a file path for custom tags file.

[yegor256]

@mximp yes, a list sounds like a good idea. A file too:

"-DofflineHash=0.*.*:abc2sd3"
"-DofflineHash=0.2.7:abc2sd3,0.2.8:s4se2fe"
"-DofflineHashFile=hello.tags"

[yegor256]

@mximp I suggest assigning this to someone

[mximp]

@Nypiaka please assist with the implementation

[mximp]

@yasamprom please assist

[mximp]

@volodya-lombrozo please take this.

[0pdd]

@mximp the puzzle #1374 is still not solved.

[0pdd]

@mximp 3 puzzles #1374, #1381, #1382 are still not solved.

[0pdd]

@mximp 4 puzzles #1374, #1381, #1382, #1387 are still not solved.

[0pdd]

@mximp 3 puzzles #1374, #1381, #1382 are still not solved; solved: #1387.

[0pdd]

@mximp 3 puzzles #1374, #1381, #1397 are still not solved; solved: #1382, #1387.

[0pdd]

@mximp 2 puzzles #1374, #1412 are still not solved; solved: #1381, #1382, #1387, #1397.

[0pdd]

@mximp the puzzle #1374 is still not solved; solved: #1381, #1382, #1387, #1397, #1412.

[0pdd]

@mximp all 6 puzzles are solved here: #1374, #1381, #1382, #1387, #1397, #1412.

[volodya-lombrozo]

@mximp we can close it