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-* Build
-** bootstrapping
-Libraries that are part of the "bootstrap set" cannot rely on
-autoloading.  Example: =files.el= must ~(eval-when-compile (require
-'pcase))~, even though it only uses autoloaded macros.
-* Tests
-** Running
-Somehow I can never remember how to ask =make= how to run a specific
-set of tests.
-
-tl;dr, running =$testcases_regexp= from =test/$testfile.el=, to test
-changes in =lisp/$sourcefile.el=:
-#+begin_src sh
-make -C test $testfile \
-     TEST_LOAD_EL=yes \
-     TEST_BACKTRACE_LINE_LENGTH=nil \
-     SELECTOR="\"$testcases_regexp\"" \
-     EMACS_EXTRAOPT="-l ../lisp/$sourcefile.el"
-#+end_src
-
-Relevant bits from test/Makefile:
-
-#+begin_src makefile
-## filename.log: run tests from filename.el(c) if .log file needs updating
-## filename: re-run tests from filename.el(c), with no logging
-#+end_src
-
-#+begin_src makefile
-# Whether to run tests from .el files in preference to .elc, we do
-# this by default since it gives nicer stacktraces.
-# If you just want a pass/fail, setting this to no is much faster.
-export TEST_LOAD_EL ?= \
-    $(if $(findstring $(MAKECMDGOALS), all check check-maybe),no,yes)
-#+end_src
-
-#+begin_src makefile
-TEST_RUN_ERT = --batch --eval '(ert-run-tests-batch-and-exit (quote ${SELECTOR_ACTUAL}))' ${WRITE_LOG}
-#+end_src
-
-#+begin_src makefile
-ifdef SELECTOR
-SELECTOR_ACTUAL=$(SELECTOR)
-#+end_src
-
-Selector documentation from ~ert-select-tests~:
-#+begin_quote
-Valid SELECTORs:
-
-nil  -- Selects the empty set.
-t    -- Selects UNIVERSE.
-:new -- Selects all tests that have not been run yet.
-:failed, :passed       -- Select tests according to their most recent result.
-:expected, :unexpected -- Select tests according to their most recent result.
-a string -- A regular expression selecting all tests with matching names.
-a test   -- (i.e., an object of the ert-test data-type) Selects that test.
-a symbol -- Selects the test that the symbol names, signals an
-    ‘ert-test-unbound’ error if none.
-(member TESTS...) -- Selects the elements of TESTS, a list of tests
-    or symbols naming tests.
-(eql TEST) -- Selects TEST, a test or a symbol naming a test.
-(and SELECTORS...) -- Selects the tests that match all SELECTORS.
-(or SELECTORS...)  -- Selects the tests that match any of the SELECTORS.
-(not SELECTOR)     -- Selects all tests that do not match SELECTOR.
-(tag TAG) -- Selects all tests that have TAG on their tags list.
-    A tag is an arbitrary label you can apply when you define a test.
-(satisfies PREDICATE) -- Selects all tests that satisfy PREDICATE.
-    PREDICATE is a function that takes an ert-test object as argument,
-    and returns non-nil if it is selected.
-#+end_quote
-** Writing
-*** Mocking functions
-#+begin_src elisp
-(cl-letf (((symbol-function 'read-something)
-           (lambda (&rest _) "result")))
-  (some-command))
-#+end_src
-
-* Third-party packages
-** forge
-*** build
-Use =config.mk= to set =LOAD_PATH=:
-#+begin_src makefile
-find-lib = $(dir $(shell emacs -Q -batch                \
-	-eval "(require 'find-func)"                    \
-	-eval "(package-initialize)"                    \
-	-eval "(require '$(1))"                         \
-	-eval "(princ (find-library-name \"$(1)\"))"))
-
-sources = ~/src/emacs/magit/lisp
-
-elpa =                                          \
-	closql                                  \
-	compat                                  \
-	dash                                    \
-	emacsql                                 \
-	ghub                                    \
-	markdown-mode                           \
-	transient                               \
-	treepy                                  \
-	with-editor                             \
-	yaml
-elpa_dirs = $(foreach d,$(elpa),$(call find-lib,$(d)))
-
-LOAD_PATH = $(addprefix -L ,$(elpa_dirs) $(sources))
-#+end_src
-
-*** load sources
-~emacs -Q -L ./lisp~ does not seem to work: after running
-~(package-initialize)~, =M-x find-library forge= returns the instance
-installed under ~package-user-dir~.
-
-This can be circumvented with ~(setq pacakge-load-list '((forge nil)
-all))~.
-
-Full command line for easy startup:
-
-#+begin_src sh
-emacs -Q -L ./lisp \
-      -eval "(setq pacakge-load-list '((forge nil) all))" \
-      -f package-initialize \
-#+end_src