Make average field length configurable for bm25 rank feature.

1 files changed, 15 insertions, 0 deletions

diff --git a/searchlib/src/tests/features/bm25/bm25_test.cpp b/searchlib/src/tests/features/bm25/bm25_test.cpp
index 3a9dfffa8d7..a3a19762101 100644
--- a/searchlib/src/tests/features/bm25/bm25_test.cpp
+++ b/searchlib/src/tests/features/bm25/bm25_test.cpp
@@ -77,6 +77,12 @@ TEST_F(Bm25BlueprintTest, blueprint_setup_fails_when_b_param_is_malformed)
     expect_setup_fail({"is"});
 }
 
+TEST_F(Bm25BlueprintTest, blueprint_setup_fails_when_avg_field_length_is_malformed)
+{
+    index_env.getProperties().add("bm25(is).averageFieldLength", "malformed");
+    expect_setup_fail({"is"});
+}
+
 TEST_F(Bm25BlueprintTest, blueprint_setup_succeeds_for_index_field)
 {
     expect_setup_succeed({"is"});
@@ -243,6 +249,15 @@ TEST_F(Bm25ExecutorTest, b_param_can_be_overriden)
     EXPECT_TRUE(execute(score(3.0, 20, idf(25))));
 }
 
+TEST_F(Bm25ExecutorTest, avg_field_length_can_be_overriden)
+{
+    test.getIndexEnv().getProperties().add("bm25(foo).averageFieldLength", "15");
+    setup();
+    prepare_term(0, 0, 3, 20);
+    scorer.avg_field_length = 15;
+    EXPECT_TRUE(execute(score(3.0, 20, idf(25))));
+}
+
 TEST_F(Bm25ExecutorTest, inverse_document_frequency_can_be_overriden_with_significance)
 {
     test.getQueryEnv().getProperties().add("vespa.term.0.significance", "0.35");