Kekun commented on code in PR #1994:
URL: https://github.com/apache/buildstream/pull/1994#discussion_r2081191058


##########
tests/frontend/show_artifact_cas_digest.py:
##########
@@ -0,0 +1,291 @@
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+# Pylint doesn't play well with fixtures and dependency injection from pytest
+# pylint: disable=redefined-outer-name
+
+import os
+import shutil
+
+import pytest
+
+from buildstream._testing import cli  # pylint: disable=unused-import
+from buildstream.exceptions import ErrorDomain
+
+from tests.testutils import (
+    create_artifact_share,
+    assert_shared,
+    assert_not_shared,
+)
+
+
+DATA_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), 
"show_artifact_cas_digest_project")
+
+
+# This tests that a target that hasn't been built locally
+# and that isn't cached remotely has not artifact CAS
+# digest.
+#
+# The test is performed without a remote cache.
+#
[email protected](DATA_DIR)
[email protected](
+    "target",
+    [
+        ("import-basic-files.bst"),
+        ("import-executable-files.bst"),
+        ("import-symlinks.bst"),
+    ],
+)
+def test_show_artifact_cas_digest_uncached_no_remote(cli, tmpdir, datafiles, 
target):
+    project = str(datafiles)
+    expected_no_digest = ""
+
+    # Check the target has not been built locally and is not existing in the 
remote cache
+    assert cli.get_element_state(project, target) != "cached" # May be 
"buildable" or "waiting" but shouldn't be "cached"
+
+    # Check the target has no artifact digest
+    result = cli.run(project=project, silent=True, args=["show", "--format", 
"%{name},%{artifact-cas-digest}", target])
+    result.assert_success()
+
+    received_digest = result.output.splitlines()[0]
+    assert received_digest == "{target},{digest}".format(target=target, 
digest=expected_no_digest)
+
+
+# This tests that a target that hasn't been built locally
+# and that isn't cached remotely has no artifact CAS
+# digest.
+#
+# The test is performed with a remote cache.
+#
[email protected](DATA_DIR)
[email protected](
+    "target",
+    [
+        ("import-basic-files.bst"),
+        ("import-executable-files.bst"),
+        ("import-symlinks.bst"),
+    ],
+)
+def test_show_artifact_cas_digest_uncached(cli, tmpdir, datafiles, target):
+    project = str(datafiles)
+    expected_no_digest = ""
+
+    # Configure a local cache
+    local_cache = os.path.join(str(tmpdir), "cache")
+    cli.configure({"cachedir": local_cache})
+
+    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as 
share:
+
+        cli.configure({"artifacts": {"servers": [{"url": share.repo}]}})
+
+        # Check the target has not been built locally and is not existing in 
the remote cache
+        assert cli.get_element_state(project, target) == "buildable"
+        assert_not_shared(cli, share, project, target)
+
+        # Check the target has no artifact digest
+        result = cli.run(project=project, silent=True, args=["show", 
"--format", "%{name},%{artifact-cas-digest}", target])
+        result.assert_success()
+
+        received_digest = result.output.splitlines()[0]
+        assert received_digest == "{target},{digest}".format(target=target, 
digest=expected_no_digest)
+
+
+# This tests that a target that has been built locally and
+# that isn't cached remotely has an artifact CAS digest.
+#
+# The test is performed with a remote cache.
+#
[email protected](DATA_DIR)
[email protected](
+    "target, expected_digest",
+    [
+        ("import-basic-files.bst", 
"7093d3c89029932ce1518bd2192e1d3cf60fd88e356b39195d10b87b598c78f0/168"),
+        ("import-executable-files.bst", 
"133a9ae2eda30945a363272ac14bb2c8a941770b5a37c2847c99934f2972ce4f/170"),
+        ("import-symlinks.bst", 
"95947ea55021e26cec4fd4f9de90d2b7f4f7d803ccc91656b3e1f2c9923ddf19/131"),
+    ],
+)
+def test_show_artifact_cas_digest_cached_locally(cli, tmpdir, datafiles, 
target, expected_digest):
+    project = str(datafiles)
+
+    # Configure a local cache
+    local_cache = os.path.join(str(tmpdir), "cache")
+    cli.configure({"cachedir": local_cache})
+
+    with create_artifact_share(os.path.join(str(tmpdir), "artifactshare")) as 
share:
+
+        cli.configure({"artifacts": {"servers": [{"url": share.repo}]}})
+
+        # Build the target locally
+        result = cli.run(project=project, silent=True, args=["build", target])
+        result.assert_success()
+
+        # Check the target has been built locally and is not existing in the 
remote cache
+        assert cli.get_element_state(project, target) == "cached"
+        assert_not_shared(cli, share, project, target)
+
+        # Check the target has an artifact digest
+        result = cli.run(project=project, silent=True, args=["show", 
"--format", "%{name},%{artifact-cas-digest}", target])
+        result.assert_success()
+
+        received_digest = result.output.splitlines()[0]
+        assert received_digest == "{target},{digest}".format(target=target, 
digest=expected_digest)
+
+
+# This tests that a target that has been built locally and
+# that is cached remotely has an artifact CAS digest.
+#
+# The test is performed with a remote cache.
+#
[email protected](DATA_DIR)
[email protected](
+    "target, expected_digest",
+    [
+        ("import-basic-files.bst", 
"7093d3c89029932ce1518bd2192e1d3cf60fd88e356b39195d10b87b598c78f0/168"),
+        ("import-executable-files.bst", 
"133a9ae2eda30945a363272ac14bb2c8a941770b5a37c2847c99934f2972ce4f/170"),
+        ("import-symlinks.bst", 
"95947ea55021e26cec4fd4f9de90d2b7f4f7d803ccc91656b3e1f2c9923ddf19/131"),
+    ],
+)
+def test_show_artifact_cas_digest_cached_remotely(cli, tmpdir, datafiles, 
target, expected_digest):

Review Comment:
   Alright I got you, setting up a remote cache is expensive, we should 
minimize the number of tests setting one up and what we test with the remote.



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