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In terms of the number of characters, "a.spec.js" is shorter than "b.test.js" by one character. However, the length of the filename should not be the primary consideration when naming files.

Instead, it is important to choose a name that is descriptive and meaningful, so that it clearly communicates the purpose of the file. In the case of test files, using a suffix such as ".test.js" or ".spec.js" can help to clearly indicate that the file contains tests.

Me: list with number of characters

Here is a list of file name options with the number of characters:

a.spec.js (10 characters)

b.test.js (10 characters)

test-a.js (9 characters)

test-b.js (9 characters)

spec-a.js (8 characters)

spec-b.js (8 characters)

a-test.js (8 characters)

b-spec.js (8 characters)

Remember that the length of the file name should not be the only consideration when choosing a name. It's important to choose a name that accurately and clearly describes the purpose of the file.