SERVER-24153 Split document_source_test.cpp into one file per stage.

1 files changed, 173 insertions, 0 deletions

diff --git a/src/mongo/db/pipeline/document_source_project_test.cpp b/src/mongo/db/pipeline/document_source_project_test.cpp
new file mode 100644
index 00000000000..12c5f72f087
--- /dev/null
+++ b/src/mongo/db/pipeline/document_source_project_test.cpp
@@ -0,0 +1,173 @@
+/**
+ *    Copyright (C) 2016 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects
+ *    for all of the code used other than as permitted herein. If you modify
+ *    file(s) with this exception, you may extend this exception to your
+ *    version of the file(s), but you are not obligated to do so. If you do not
+ *    wish to do so, delete this exception statement from your version. If you
+ *    delete this exception statement from all source files in the program,
+ *    then also delete it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include <vector>
+
+#include "mongo/bson/bsonelement.h"
+#include "mongo/bson/bsonmisc.h"
+#include "mongo/bson/bsonobj.h"
+#include "mongo/bson/json.h"
+#include "mongo/db/pipeline/aggregation_context_fixture.h"
+#include "mongo/db/pipeline/dependencies.h"
+#include "mongo/db/pipeline/document_source.h"
+#include "mongo/db/pipeline/value.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+namespace {
+using boost::intrusive_ptr;
+using std::vector;
+
+//
+// DocumentSourceProject delegates much of its responsibilities to the ParsedAggregationProjection.
+// Most of the functional tests are testing ParsedAggregationProjection directly. These are meant as
+// simpler integration tests.
+//
+
+// This provides access to getExpCtx(), but we'll use a different name for this test suite.
+using ProjectStageTest = AggregationContextFixture;
+
+TEST_F(ProjectStageTest, InclusionProjectionShouldRemoveUnspecifiedFields) {
+    auto project =
+        DocumentSourceProject::create(BSON("a" << true << "c" << BSON("d" << true)), getExpCtx());
+    auto source = DocumentSourceMock::create("{_id: 0, a: 1, b: 1, c: {d: 1}}");
+    project->setSource(source.get());
+    // The first result exists and is as expected.
+    auto next = project->getNext();
+    ASSERT_TRUE(next.isAdvanced());
+    ASSERT_EQUALS(1, next.getDocument().getField("a").getInt());
+    ASSERT(next.getDocument().getField("b").missing());
+    // The _id field is included by default in the root document.
+    ASSERT_EQUALS(0, next.getDocument().getField("_id").getInt());
+    // The nested c.d inclusion.
+    ASSERT_EQUALS(1, next.getDocument()["c"]["d"].getInt());
+}
+
+TEST_F(ProjectStageTest, ShouldOptimizeInnerExpressions) {
+    auto project = DocumentSourceProject::create(
+        BSON("a" << BSON("$and" << BSON_ARRAY(BSON("$const" << true)))), getExpCtx());
+    project->optimize();
+    // The $and should have been replaced with its only argument.
+    vector<Value> serializedArray;
+    project->serializeToArray(serializedArray);
+    ASSERT_BSONOBJ_EQ(serializedArray[0].getDocument().toBson(),
+                      fromjson("{$project: {_id: true, a: {$const: true}}}"));
+}
+
+TEST_F(ProjectStageTest, ShouldErrorOnNonObjectSpec) {
+    BSONObj spec = BSON("$project"
+                        << "foo");
+    BSONElement specElement = spec.firstElement();
+    ASSERT_THROWS(DocumentSourceProject::createFromBson(specElement, getExpCtx()), UserException);
+}
+
+/**
+ * Basic sanity check that two documents can be projected correctly with a simple inclusion
+ * projection.
+ */
+TEST_F(ProjectStageTest, InclusionShouldBeAbleToProcessMultipleDocuments) {
+    auto project = DocumentSourceProject::create(BSON("a" << true), getExpCtx());
+    auto source = DocumentSourceMock::create({"{a: 1, b: 2}", "{a: 3, b: 4}"});
+    project->setSource(source.get());
+    auto next = project->getNext();
+    ASSERT(next.isAdvanced());
+    ASSERT_EQUALS(1, next.getDocument().getField("a").getInt());
+    ASSERT(next.getDocument().getField("b").missing());
+
+    next = project->getNext();
+    ASSERT(next.isAdvanced());
+    ASSERT_EQUALS(3, next.getDocument().getField("a").getInt());
+    ASSERT(next.getDocument().getField("b").missing());
+
+    ASSERT(project->getNext().isEOF());
+    ASSERT(project->getNext().isEOF());
+    ASSERT(project->getNext().isEOF());
+}
+
+/**
+ * Basic sanity check that two documents can be projected correctly with a simple inclusion
+ * projection.
+ */
+TEST_F(ProjectStageTest, ExclusionShouldBeAbleToProcessMultipleDocuments) {
+    auto project = DocumentSourceProject::create(BSON("a" << false), getExpCtx());
+    auto source = DocumentSourceMock::create({"{a: 1, b: 2}", "{a: 3, b: 4}"});
+    project->setSource(source.get());
+    auto next = project->getNext();
+    ASSERT(next.isAdvanced());
+    ASSERT(next.getDocument().getField("a").missing());
+    ASSERT_EQUALS(2, next.getDocument().getField("b").getInt());
+
+    next = project->getNext();
+    ASSERT(next.isAdvanced());
+    ASSERT(next.getDocument().getField("a").missing());
+    ASSERT_EQUALS(4, next.getDocument().getField("b").getInt());
+
+    ASSERT(project->getNext().isEOF());
+    ASSERT(project->getNext().isEOF());
+    ASSERT(project->getNext().isEOF());
+}
+
+TEST_F(ProjectStageTest, InclusionShouldAddDependenciesOfIncludedAndComputedFields) {
+    auto project = DocumentSourceProject::create(
+        fromjson("{a: true, x: '$b', y: {$and: ['$c','$d']}, z: {$meta: 'textScore'}}"),
+        getExpCtx());
+    DepsTracker dependencies(DepsTracker::MetadataAvailable::kTextScore);
+    ASSERT_EQUALS(DocumentSource::EXHAUSTIVE_FIELDS, project->getDependencies(&dependencies));
+    ASSERT_EQUALS(5U, dependencies.fields.size());
+
+    // Implicit _id dependency.
+    ASSERT_EQUALS(1U, dependencies.fields.count("_id"));
+
+    // Inclusion dependency.
+    ASSERT_EQUALS(1U, dependencies.fields.count("a"));
+
+    // Field path expression dependency.
+    ASSERT_EQUALS(1U, dependencies.fields.count("b"));
+
+    // Nested expression dependencies.
+    ASSERT_EQUALS(1U, dependencies.fields.count("c"));
+    ASSERT_EQUALS(1U, dependencies.fields.count("d"));
+    ASSERT_EQUALS(false, dependencies.needWholeDocument);
+    ASSERT_EQUALS(true, dependencies.getNeedTextScore());
+}
+
+TEST_F(ProjectStageTest, ExclusionShouldNotAddDependencies) {
+    auto project = DocumentSourceProject::create(fromjson("{a: false, 'b.c': false}"), getExpCtx());
+
+    DepsTracker dependencies;
+    ASSERT_EQUALS(DocumentSource::SEE_NEXT, project->getDependencies(&dependencies));
+
+    ASSERT_EQUALS(0U, dependencies.fields.size());
+    ASSERT_EQUALS(false, dependencies.needWholeDocument);
+    ASSERT_EQUALS(false, dependencies.getNeedTextScore());
+}
+
+}  // namespace
+}  // namespace mongo