[bug#65866,v2,8/8] tests: Assume ‘git’ is always available.

diff --git a/tests/channels.scm b/tests/channels.scm
index 62312e240c..6c4276deb4 100644
--- a/tests/channels.scm
+++ b/tests/channels.scm
@@ -50,7 +50,7 @@  (define-module (test-channels)
   #:use-module (ice-9 match))
 
 (define (gpg+git-available?)
-  (and (which (git-command))
+  (and #t                                         ;'git' is always available
        (which (gpg-command)) (which (gpgconf-command))))
 
 (define commit-id-string
@@ -196,7 +196,6 @@  (define channel-metadata-dependencies
                                           "abc1234")))
                          instances)))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-channel-instances #:validate-pull"
   'descendant
 
@@ -306,7 +305,6 @@  (define channel-metadata-dependencies
                (depends? drv3
                          (list drv2 drv0) (list))))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "channel-news, no news"
   '()
   (with-temporary-git-repository directory
@@ -318,7 +316,6 @@  (define channel-metadata-dependencies
             (latest  (reference-name->oid repository "HEAD")))
         (channel-news-for-commit channel (oid->string latest))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "channel-news, one entry"
   (with-temporary-git-repository directory
       `((add ".guix-channel"
@@ -406,7 +403,6 @@  (define channel-metadata-dependencies
                          (channel-news-for-commit channel commit5 commit1))
                     '(#f "tag-for-first-news-entry")))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "channel-news, annotated tag"
   (with-temporary-git-repository directory
       `((add ".guix-channel"
@@ -453,7 +449,6 @@  (define channel-metadata-dependencies
                          (channel-news-for-commit channel commit2))
                     (list commit1)))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "latest-channel-instances, missing introduction for 'guix'"
   (with-temporary-git-repository directory
       '((add "a.txt" "A")
diff --git a/tests/derivations.scm b/tests/derivations.scm
index e1312bd46b..0e87778981 100644
--- a/tests/derivations.scm
+++ b/tests/derivations.scm
@@ -29,7 +29,7 @@  (define-module (test-derivations)
   #:use-module (guix tests git)
   #:use-module (guix tests http)
   #:use-module ((guix packages) #:select (package-derivation base32))
-  #:use-module ((guix build utils) #:select (executable-file? which))
+  #:use-module ((guix build utils) #:select (executable-file?))
   #:use-module ((guix hash) #:select (file-hash*))
   #:use-module ((git oid) #:select (oid->string))
   #:use-module ((git reference) #:select (reference-name->oid))
@@ -295,8 +295,6 @@  (define* (directory-contents dir #:optional (slurp get-bytevector-all))
                          get-string-all)
                        text))))))
 
-;; 'with-temporary-git-repository' relies on the 'git' command.
-(unless (which (git-command)) (test-skip 1))
 (test-equal "'git-download' built-in builder"
   `(("/a.txt" . "AAA")
     ("/b.scm" . "#t"))
@@ -325,7 +323,6 @@  (define* (directory-contents dir #:optional (slurp get-bytevector-all))
         (build-derivations %store (list drv))
         (directory-contents (derivation->output-path drv) get-string-all)))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "'git-download' built-in builder, invalid hash"
   (with-temporary-git-repository directory
       `((add "a.txt" "AAA")
@@ -349,7 +346,6 @@  (define* (directory-contents dir #:optional (slurp get-bytevector-all))
         (build-derivations %store (list drv))
         #f))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "'git-download' built-in builder, invalid commit"
   (with-temporary-git-repository directory
       `((add "a.txt" "AAA")
diff --git a/tests/git-authenticate.scm b/tests/git-authenticate.scm
index c063920c12..4de223d422 100644
--- a/tests/git-authenticate.scm
+++ b/tests/git-authenticate.scm
@@ -44,7 +44,6 @@  (define (gpg+git-available?)
 
 (test-begin "git-authenticate")
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "unsigned commits"
   (with-temporary-git-repository directory
       '((add "a.txt" "A")
diff --git a/tests/git.scm b/tests/git.scm
index 9c944d65b1..ad43435b67 100644
--- a/tests/git.scm
+++ b/tests/git.scm
@@ -21,7 +21,6 @@  (define-module (test-git)
   #:use-module (git)
   #:use-module (guix git)
   #:use-module (guix tests git)
-  #:use-module (guix build utils)
   #:use-module ((guix utils) #:select (call-with-temporary-directory))
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-64)
@@ -33,8 +32,6 @@  (define-module (test-git)
 
 (test-begin "git")
 
-;; 'with-temporary-git-repository' relies on the 'git' command.
-(unless (which (git-command)) (test-skip 1))
 (test-assert "commit-difference, linear history"
   (with-temporary-git-repository directory
       '((add "a.txt" "A")
@@ -61,7 +58,6 @@  (define-module (test-git)
              ;; empty list.
              (null? (commit-difference commit1 commit4)))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "commit-difference, fork"
   (with-temporary-git-repository directory
       '((add "a.txt" "A")
@@ -101,7 +97,6 @@  (define-module (test-git)
              (lset= eq? (commit-difference master4 master2)
                     (list master4 merge master3 devel1 devel2)))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "commit-difference, excluded commits"
   (with-temporary-git-repository directory
       '((add "a.txt" "A")
@@ -126,7 +121,6 @@  (define-module (test-git)
                     (list commit4))
              (null? (commit-difference commit4 commit1 (list commit5))))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "commit-relation"
   '(self                                          ;master3 master3
     ancestor                                      ;master1 master3
@@ -166,7 +160,6 @@  (define-module (test-git)
               (commit-relation master1 merge)
               (commit-relation merge master1))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "commit-descendant?"
   '((master3 master3 => #t)
     (master1 master3 => #f)
@@ -216,7 +209,6 @@  (define-module (test-git)
                   (master1 merge)
                   (merge master1)))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "remote-refs"
   '("refs/heads/develop" "refs/heads/master"
     "refs/tags/v1.0" "refs/tags/v1.1")
@@ -231,7 +223,6 @@  (define-module (test-git)
         (tag "v1.1" "release-1.1"))
     (remote-refs directory)))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "remote-refs: only tags"
  '("refs/tags/v1.0" "refs/tags/v1.1")
   (with-temporary-git-repository directory
@@ -243,7 +234,6 @@  (define-module (test-git)
         (tag "v1.1" "Release 1.1"))
     (remote-refs directory #:tags? #t)))
 
-(unless (which (git-command)) (test-skip 1))
 (test-assert "update-cached-checkout, tag"
   (call-with-temporary-directory
    (lambda (cache)
diff --git a/tests/import-git.scm b/tests/import-git.scm
index f1bce154bb..20255dedb3 100644
--- a/tests/import-git.scm
+++ b/tests/import-git.scm
@@ -24,7 +24,6 @@  (define-module (test-import-git)
   #:use-module (guix import git)
   #:use-module (guix git-download)
   #:use-module (guix tests git)
-  #:use-module (guix build utils)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-64))
 
@@ -46,7 +45,6 @@  (define* (make-package directory version #:optional (properties '()))
         (base32
          "0000000000000000000000000000000000000000000000000000"))))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: no custom prefix, suffix, and delimiter"
   "1.0.1"
   (with-temporary-git-repository directory
@@ -56,7 +54,6 @@  (define* (make-package directory version #:optional (properties '()))
     (let ((package (make-package directory "1.0.0")))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: custom prefix, no suffix and delimiter"
   "1.0.1"
   (with-temporary-git-repository directory
@@ -67,7 +64,6 @@  (define* (make-package directory version #:optional (properties '()))
                                  '((release-tag-prefix . "prefix-")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: custom suffix, no prefix and delimiter"
   "1.0.1"
   (with-temporary-git-repository directory
@@ -78,7 +74,6 @@  (define* (make-package directory version #:optional (properties '()))
                                  '((release-tag-suffix . "-suffix-[0-9]*")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: custom delimiter, no prefix and suffix"
   "2021.09.07"
   (with-temporary-git-repository directory
@@ -89,7 +84,6 @@  (define* (make-package directory version #:optional (properties '()))
                                  '((release-tag-version-delimiter . "-")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: empty delimiter, no prefix and suffix"
   "20210907"
   (with-temporary-git-repository directory
@@ -100,7 +94,6 @@  (define* (make-package directory version #:optional (properties '()))
                                  '((release-tag-version-delimiter . "")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: custom prefix and suffix, no delimiter"
   "2.0.0"
   (with-temporary-git-repository directory
@@ -112,7 +105,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-suffix . "suffix-[0-9]")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: custom prefix, suffix, and delimiter"
   "2.0.0"
   (with-temporary-git-repository directory
@@ -125,7 +117,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-version-delimiter . "_")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: only pre-releases available"
   #f
   (with-temporary-git-repository directory
@@ -135,7 +126,6 @@  (define* (make-package directory version #:optional (properties '()))
     (let ((package (make-package directory "1.0.0")))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases"
   "2.0.0-rc1"
   (with-temporary-git-repository directory
@@ -146,7 +136,6 @@  (define* (make-package directory version #:optional (properties '()))
                                  '((accept-pre-releases? . #t)))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, and custom prefix"
   "2.0.0-rc1"
   (with-temporary-git-repository directory
@@ -158,7 +147,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-prefix . "version-")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, and custom suffix"
   "2.0.0-rc1"
   (with-temporary-git-repository directory
@@ -170,7 +158,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-suffix . "-suffix")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, delimiter conflicts with pre-release part"
   "2.0.0_alpha"
   (with-temporary-git-repository directory
@@ -182,7 +169,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-version-delimiter . "_")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, and custom suffix and prefix"
   "2.0.0-alpha"
   (with-temporary-git-repository directory
@@ -195,7 +181,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-suffix . "-suffix")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, and custom suffix, prefix, and delimiter"
   "2.0.0-alpha"
   (with-temporary-git-repository directory
@@ -209,7 +194,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-version-delimiter . "-")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: accept pre-releases, no delimiter, and custom suffix, prefix"
   "2alpha"
   (with-temporary-git-repository directory
@@ -223,7 +207,6 @@  (define* (make-package directory version #:optional (properties '()))
                                    (release-tag-version-delimiter . "")))))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: no tags found"
   #f
   (with-temporary-git-repository directory
@@ -232,7 +215,6 @@  (define* (make-package directory version #:optional (properties '()))
     (let ((package (make-package directory "1.0.0")))
       (latest-git-tag-version package))))
 
-(unless (which (git-command)) (test-skip 1))
 (test-equal "latest-git-tag-version: no valid tags found"
   #f
   (with-temporary-git-repository directory