tests: make tests with temporary environment setting portable With "dash" (as "/bin/sh" on Debian GNU/Linux), command execution in "ENV=val foo bar" style doesn't work as expect in test script files, if "foo" is user-defined function: it works fine, if "foo" is existing commands like "hg". 09049042ab99 introduced tests for HGPLAIN and HGPLAINEXCEPT into test-revset.t, and all of them are in such style. This patch doesn't: - add explicit unsetting for HGPLAIN and HGPLAINEXCEPT they are already introduced by 09049042ab99 - write assignment and exporting in one line "ENV=val; export ENV" for two or more environment variables in one line causes failure of test-check-code-hg.t: it is recognized as "don't export and assign at once" unfortunately.

     1

% lazy ancestor set for [], stoprev = 0, inclusive = False

     2

membership: []

     3

iteration:  []

     4

% lazy ancestor set for [11, 13], stoprev = 0, inclusive = False

     5

membership: [7, 8, 3, 4, 1, 0]

     6

iteration:  [3, 7, 8, 1, 4, 0, 2]

     7

% lazy ancestor set for [1, 3], stoprev = 0, inclusive = False

     8

membership: [1, 0]

     9

iteration:  [0, 1]

    10

% lazy ancestor set for [11, 13], stoprev = 0, inclusive = True

    11

membership: [11, 13, 7, 8, 3, 4, 1, 0]

    12

iteration:  [11, 13, 3, 7, 8, 1, 4, 0, 2]

    13

% lazy ancestor set for [11, 13], stoprev = 6, inclusive = False

    14

membership: [7, 8]

    15

iteration:  [7, 8]

    16

% lazy ancestor set for [11, 13], stoprev = 6, inclusive = True

    17

membership: [11, 13, 7, 8]

    18

iteration:  [11, 13, 7, 8]