diff --git a/tests/unit/csv.cc b/tests/unit/csv.cc
index fcb27da..2135081 100644
--- a/tests/unit/csv.cc
+++ b/tests/unit/csv.cc
@@ -1,6 +1,9 @@
+#include <sstream>
+
 #include <gtest/gtest.h>
 
 #include "csv/read-csv.hh"
+#include "csv/write-csv.hh"
 
 // Allow namespace pollution in tests for convenience
 using namespace kraken::csv;
@@ -36,3 +39,32 @@ TEST(read_csv, single_line_with_header) {
     };
     ASSERT_EQ(read_csv("a,b,c\n1,2,3", CsvHeader::KEEP), expected);
 }
+
+TEST(write_csv, empty) {
+    auto const csv = csv_type{};
+    auto const expected = "";
+    auto output = std::ostringstream{};
+    write_csv(output, csv);
+    ASSERT_EQ(output.str(), expected);
+}
+
+TEST(write_csv, DISABLED_single_line) {
+    auto const csv = csv_type{
+        {"a", "b", "c"},
+    };
+    auto const expected = "a,b,c\n";
+    auto output = std::ostringstream{};
+    write_csv(output, csv);
+    ASSERT_EQ(output.str(), expected);
+}
+
+TEST(write_csv, DISABLED_multiple_lines) {
+    auto const csv = csv_type{
+        {"a", "b", "c"},
+        {"1", "2", "3"},
+    };
+    auto const expected = "a,b,c\n1,2,3\n";
+    auto output = std::ostringstream{};
+    write_csv(output, csv);
+    ASSERT_EQ(output.str(), expected);
+}