SERVER-17635 Add Unittests for new parts of SDI::Cursor API

1 files changed, 139 insertions, 0 deletions

diff --git a/src/mongo/db/storage/sorted_data_interface_test_cursor_seek_exact.cpp b/src/mongo/db/storage/sorted_data_interface_test_cursor_seek_exact.cpp
new file mode 100644
index 00000000000..926b23b5237
--- /dev/null
+++ b/src/mongo/db/storage/sorted_data_interface_test_cursor_seek_exact.cpp
@@ -0,0 +1,139 @@
+/**
+ *    Copyright (C) 2015 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/db/storage/sorted_data_interface_test_harness.h"
+
+#include <memory>
+
+#include "mongo/db/storage/sorted_data_interface.h"
+#include "mongo/unittest/unittest.h"
+
+namespace mongo {
+    // Tests seekExact when it hits something.
+    void testSeekExact_Hit(bool unique, bool forward) {
+        auto harnessHelper = newHarnessHelper();
+        auto opCtx = harnessHelper->newOperationContext();
+        auto sorted = harnessHelper->newSortedDataInterface(unique, {
+            {key1, loc1},
+            {key2, loc1},
+            {key3, loc1},
+        });
+
+        auto cursor = sorted->newCursor(opCtx.get(), forward);
+
+        ASSERT_EQ(cursor->seekExact(key2), IndexKeyEntry(key2, loc1));
+
+        // Make sure iterating works. We may consider loosening this requirement if it is a hardship
+        // for some storage engines.
+        ASSERT_EQ(cursor->next(), IndexKeyEntry(forward ? key3 : key1, loc1));
+        ASSERT_EQ(cursor->next(), boost::none);
+    }
+    TEST(SortedDataInterface, SeekExact_Hit_Unique_Forward) {
+        testSeekExact_Hit(true, true);
+    }
+    TEST(SortedDataInterface, SeekExact_Hit_Unique_Reverse) {
+        testSeekExact_Hit(true, false);
+    }
+    TEST(SortedDataInterface, SeekExact_Hit_Standard_Forward) {
+        testSeekExact_Hit(false, true);
+    }
+    TEST(SortedDataInterface, SeekExact_Hit_Standard_Reverse) {
+        testSeekExact_Hit(false, false);
+    }
+
+    // Tests seekExact when it doesn't hit the query.
+    void testSeekExact_Miss(bool unique, bool forward) {
+        auto harnessHelper = newHarnessHelper();
+        auto opCtx = harnessHelper->newOperationContext();
+        auto sorted = harnessHelper->newSortedDataInterface(unique, {
+            {key1, loc1},
+            // No key2.
+            {key3, loc1},
+        });
+
+        auto cursor = sorted->newCursor(opCtx.get(), forward);
+
+        ASSERT_EQ(cursor->seekExact(key2), boost::none);
+
+        // Not testing iteration since the cursors position following a failed seekExact is
+        // undefined. However, you must be able to seek somewhere else.
+        ASSERT_EQ(cursor->seekExact(key1), IndexKeyEntry(key1, loc1));
+    }
+    TEST(SortedDataInterface, SeekExact_Miss_Unique_Forward) {
+        testSeekExact_Miss(true, true);
+    }
+    TEST(SortedDataInterface, SeekExact_Miss_Unique_Reverse) {
+        testSeekExact_Miss(true, false);
+    }
+    TEST(SortedDataInterface, SeekExact_Miss_Standard_Forward) {
+        testSeekExact_Miss(false, true);
+    }
+    TEST(SortedDataInterface, SeekExact_Miss_Standard_Reverse) {
+        testSeekExact_Miss(false, false);
+    }
+    
+    // Tests seekExact on forward cursor when it hits something with dup keys. Doesn't make sense
+    // for unique indexes.
+    TEST(SortedDataInterface, SeekExact_HitWithDups_Forward) {
+        auto harnessHelper = newHarnessHelper();
+        auto opCtx = harnessHelper->newOperationContext();
+        auto sorted = harnessHelper->newSortedDataInterface(false, {
+            {key1, loc1},
+            {key2, loc1},
+            {key2, loc2},
+            {key3, loc1},
+        });
+
+        auto cursor = sorted->newCursor(opCtx.get());
+
+        ASSERT_EQ(cursor->seekExact(key2), IndexKeyEntry(key2, loc1));
+        ASSERT_EQ(cursor->next(), IndexKeyEntry(key2, loc2));
+        ASSERT_EQ(cursor->next(), IndexKeyEntry(key3, loc1));
+        ASSERT_EQ(cursor->next(), boost::none);
+    }
+
+    // Tests seekExact on reverse cursor when it hits something with dup keys. Doesn't make sense
+    // for unique indexes.
+    TEST(SortedDataInterface, SeekExact_HitWithDups_Reverse) {
+        auto harnessHelper = newHarnessHelper();
+        auto opCtx = harnessHelper->newOperationContext();
+        auto sorted = harnessHelper->newSortedDataInterface(false, {
+            {key1, loc1},
+            {key2, loc1},
+            {key2, loc2},
+            {key3, loc1},
+        });
+
+        auto cursor = sorted->newCursor(opCtx.get(), false);
+
+        ASSERT_EQ(cursor->seekExact(key2), IndexKeyEntry(key2, loc2));
+        ASSERT_EQ(cursor->next(), IndexKeyEntry(key2, loc1));
+        ASSERT_EQ(cursor->next(), IndexKeyEntry(key1, loc1));
+        ASSERT_EQ(cursor->next(), boost::none);
+    }
+} // namespace mongo