unikernel/duniverse/dune_/test/blackbox-tests/test-cases/runtest-cmd.t

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+Here we test the features of the `dune runtest` command. 
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.16)
+  > EOF
+
+  $ cat > mytest.t <<EOF
+  >   $ echo "Hello, world!"
+  > "Goodbye, world!"
+  > EOF
+  $ mkdir -p tests/myothertest.t
+  $ echo 'Hello, world!' > tests/myothertest.t/hello.world
+  $ cat > tests/myothertest.t/run.t <<EOF
+  >   $ cat hello.world
+  > "Goodbye, world!"
+  > EOF
+  $ cat > tests/filetest.t <<EOF
+  >   $ echo "Hello, world!"
+  > "Goodbye, world!"
+  > EOF
+
+
+This should work:
+
+  $ dune test tests/myothertest.t
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+  Error: Files _build/default/tests/myothertest.t/run.t and
+  _build/default/tests/myothertest.t/run.t.corrected differ.
+  [1]
+
+There is no diff produced because the test passes
+
+  $ dune promotion diff tests/myothertest.t/run.t
+
+This should not work
+
+  $ dune test myotherttest.t
+  Error: "myotherttest.t" does not match any known test.
+  [1]
+
+This is a bug. Running the test this way does not correctly include the
+dependencies.
+
+  $ dune test tests/myothertest.t/run.t
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+  Error: Files _build/default/tests/myothertest.t/run.t and
+  _build/default/tests/myothertest.t/run.t.corrected differ.
+  [1]
+
+  $ dune promotion diff tests/myothertest.t/run.t
+
+  $ cat _build/.promotion-staging/tests/myothertest.t/run.t
+    $ cat hello.world
+    cat: hello.world: No such file or directory
+    [1]
+  "Goodbye, world!"
+
+Passing no arguments to $ dune runtest should be equivalent to $ dune build
+@runtest.
+
+  $ dune test 2>&1 | grep "^File"
+  File "mytest.t", line 1, characters 0-0:
+  File "tests/filetest.t", line 1, characters 0-0:
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+
+Passing the name of a test should only run that test.
+
+  $ dune test mytest.t 2>&1 | grep "^File"
+  File "mytest.t", line 1, characters 0-0:
+  $ dune test tests/myothertest.t 2>&1 | grep "^File"
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+
+Passing a directory should run all the tests in that directory (recursively).
+
+- The current working directory:
+  $ dune test . 2>&1 | grep "^File"
+  File "mytest.t", line 1, characters 0-0:
+  File "tests/filetest.t", line 1, characters 0-0:
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+
+- The tests/ subdirectory:
+  $ dune test tests/ 2>&1 | grep "^File"
+  File "tests/filetest.t", line 1, characters 0-0:
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+
+- We can also build in _build/ directories:
+  $ dune test _build/default 2>&1 | grep "^File"
+  File "mytest.t", line 1, characters 0-0:
+  File "tests/filetest.t", line 1, characters 0-0:
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+  $ dune test _build/default/tests 2>&1 | grep "^File"
+  File "tests/filetest.t", line 1, characters 0-0:
+  File "tests/myothertest.t/run.t", line 1, characters 0-0:
+
+- We can build in absolute paths:
+  $ dune test $PWD/mytest.t
+  File "mytest.t", line 1, characters 0-0:
+  Error: Files _build/default/mytest.t and _build/default/mytest.t.corrected
+  differ.
+  [1]
+  $ dune test $PWD/_build/default/mytest.t
+  File "mytest.t", line 1, characters 0-0:
+  Error: Files _build/default/mytest.t and _build/default/mytest.t.corrected
+  differ.
+  [1]
+
+Here we test some error cases a user may encounter and make sure the error
+messages are informative enough.
+
+- Giving a path outside the workspace gives an informative error:
+  $ dune test ..
+  Error: path outside the workspace: .. from .
+  [1]
+- Giving a nonexistent path gives an informative error:
+  $ dune test nonexistent
+  Error: "nonexistent" does not match any known test.
+  [1]
+  $ dune test tests/non
+  Error: "tests/non" does not match any known test.
+  [1]
+- Passing the _build directory on its own is an error.
+  $ dune test _build
+  Error: This path is internal to dune: _build
+  [1]
+- Typos are caught and aided with hints:
+  $ dune test mytest1.t
+  Error: "mytest1.t" does not match any known test.
+  Hint: did you mean mytest.t?
+  [1]
+- Running a non-test file should give a suitable error message
+  $ dune test dune-project
+  Error: "dune-project" does not match any known test.
+  [1]
+- Typos of diretories are also caught and aided:
+  $ dune test tests/myothertest1.t
+  Error: "tests/myothertest1.t" does not match any known test.
+  Hint: did you mean tests/myothertest.t?
+  [1]
+  $ dune test testt/
+  Error: "testt" does not match any known test.
+  Hint: did you mean tests?
+  [1]
+- Note that this does not handle the case where the path is mostly correct but
+the directory is mispelled.
+  $ dune test testss/myothertest.t
+  Error: "testss/myothertest.t" does not match any known test.
+  [1]
+- Private _build/ paths should be rejected.
+  $ dune test _build/_private
+  Error: This path is internal to dune: _build/_private
+  [1]
+- Install paths should be rejected.
+  $ dune test _build/install/default
+  Error: This path is internal to dune: _build/install/default
+  [1]
+- Absolute paths that are invalid are rejected clearly:
+  $ dune test $PWD/..
+  Error: path outside the workspace: .. from .
+  [1]
+  $ dune test /a/b/c/
+  Error: This path is outside the workspace: /a/b/c/
+  [1]
+
+Here we test behavour for running tests in specific contexts.
+
+  $ cat > dune-workspace <<EOF
+  > (lang dune 3.20)
+  > (context (default))
+  > (context (default (name alt)))
+  > EOF
+
+- Building a specific test now will run them in both contexts.
+
+  $ dune test mytest.t
+  File "mytest.t", line 1, characters 0-0:
+  Error: Files _build/alt/mytest.t and _build/alt/mytest.t.corrected differ.
+  File "mytest.t", line 1, characters 0-0:
+  Error: Files _build/default/mytest.t and _build/default/mytest.t.corrected
+  differ.
+  [1]
+
+- Building a specific test in a specific build directory will build only in
+that context as expected.
+
+  $ dune test _build/alt/mytest.t
+  File "mytest.t", line 1, characters 0-0:
+  Error: Files _build/alt/mytest.t and _build/alt/mytest.t.corrected differ.
+  [1]
+