Added tests for vectors with zero dimensions [skip ci]

Author: ankane

test/halfvec_test.cpp

@@ -16,6 +16,11 @@ static void test_constructor_span() {
     assert_equal(vec.dimensions(), 3u);
 }
 
+static void test_constructor_empty() {
+    HalfVector vec{std::vector<pgvector::Half>{}};
+    assert_equal(vec.dimensions(), 0u);
+}
+
 static void test_values() {
     HalfVector vec{{1, 2, 3}};
     assert_equal(vec.values() == std::vector<pgvector::Half>{1, 2, 3}, true);
@@ -24,5 +29,6 @@ static void test_values() {
 void test_halfvec() {
     test_constructor_vector();
     test_constructor_span();
+    test_constructor_empty();
     test_values();
 }

test/pqxx_test.cpp

@@ -231,6 +231,7 @@ void test_sparsevec_to_string() {
 void test_sparsevec_from_string() {
     assert_equal(pqxx::from_string<pgvector::SparseVector>("{1:1,3:2,5:3}/6"), pgvector::SparseVector{{1, 0, 2, 0, 3, 0}});
     assert_equal(pqxx::from_string<pgvector::SparseVector>("{}/6"), pgvector::SparseVector{{0, 0, 0, 0, 0, 0}});
+    assert_equal(pqxx::from_string<pgvector::SparseVector>("{}/0"), pgvector::SparseVector{std::vector<float>{}});
 
     assert_exception<pqxx::conversion_error>([] {
         auto _ = pqxx::from_string<pgvector::SparseVector>("");

test/sparsevec_test.cpp

@@ -35,8 +35,17 @@ static void test_constructor_map() {
     }, "sparsevec index out of bounds");
 }
 
+static void test_constructor_empty() {
+    SparseVector vec{std::vector<float>{}};
+    assert_equal(vec.dimensions(), 0);
+
+    SparseVector vec2{{}, 0};
+    assert_equal(vec2.dimensions(), 0);
+}
+
 void test_sparsevec() {
     test_constructor_vector();
     test_constructor_span();
+    test_constructor_empty();
     test_constructor_map();
 }

test/vector_test.cpp

@@ -16,6 +16,11 @@ static void test_constructor_span() {
     assert_equal(vec.dimensions(), 3u);
 }
 
+static void test_constructor_empty() {
+    Vector vec{std::vector<float>{}};
+    assert_equal(vec.dimensions(), 0u);
+}
+
 static void test_values() {
     Vector vec{{1, 2, 3}};
     assert_equal(vec.values() == std::vector<float>{1, 2, 3}, true);
@@ -24,5 +29,6 @@ static void test_values() {
 void test_vector() {
     test_constructor_vector();
     test_constructor_span();
+    test_constructor_empty();
     test_values();
 }