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diff --git a/test/test_column_namer.cc b/test/test_column_namer.cc
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+/**
+ * Copyright (c) 2022, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <iostream>
+
+#include "config.h"
+
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "column_namer.hh"
+#include "doctest/doctest.h"
+
+TEST_CASE("column_namer::default")
+{
+    column_namer cn{column_namer::language::SQL};
+
+    auto def_name0 = cn.add_column(string_fragment{});
+    CHECK(def_name0 == "col_0");
+    auto def_name1 = cn.add_column(string_fragment{});
+    CHECK(def_name1 == "col_1");
+}
+
+TEST_CASE("column_namer::no-collision")
+{
+    column_namer cn{column_namer::language::SQL};
+
+    auto name0 = cn.add_column(string_fragment{"abc"});
+    CHECK(name0 == "abc");
+    auto name1 = cn.add_column(string_fragment{"def"});
+    CHECK(name1 == "def");
+}
+
+TEST_CASE("column_namer::collisions")
+{
+    column_namer cn{column_namer::language::SQL};
+
+    auto name0 = cn.add_column(string_fragment{"abc"});
+    CHECK(name0 == "abc");
+    auto name1 = cn.add_column(string_fragment{"abc"});
+    CHECK(name1 == "abc_0");
+    auto name2 = cn.add_column(string_fragment{"abc"});
+    CHECK(name2 == "abc_1");
+}