added where condition

test/CMakeLists.txt

@@ -0,0 +1,13 @@
+Include(FetchContent)
+
+FetchContent_Declare(
+        Catch2
+        GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+        GIT_TAG        v3.4.0 # or a later release
+)
+
+FetchContent_MakeAvailable(Catch2)
+
+add_executable(tests builder.cpp)
+target_link_libraries(tests PRIVATE Catch2::Catch2WithMain matador)
+target_include_directories(tests PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>/include)

test/builder.cpp

@@ -0,0 +1,77 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include <matador/sql/column.hpp>
+#include <matador/sql/condition.hpp>
+#include <matador/sql/dialect.hpp>
+#include <matador/sql/query_builder.hpp>
+
+using namespace matador::sql;
+
+TEST_CASE("Create table", "[query]") {
+    dialect d;
+    query_builder query(d);
+    const auto sql = query.create().table("person", {
+        make_pk_column<unsigned long>("id"),
+        make_column<std::string>("name", 255),
+        make_column<unsigned short>("age")
+    }).compile();
+
+    REQUIRE(sql == R"##(CREATE TABLE "person" ("id" BIGINT NOT NULL PRIMARY KEY, "name" VARCHAR(255), "age" INTEGER))##");
+}
+
+TEST_CASE("Drop table", "[query]") {
+  dialect d;
+  query_builder query(d);
+  const auto sql = query.drop().table("person").compile();
+
+  REQUIRE(sql == R"(DROP TABLE "person")");
+}
+
+TEST_CASE("Select", "[query]") {
+    dialect d;
+    query_builder query(d);
+    const auto sql = query.select({"id", "name", "age"}).from("person").compile();
+
+    REQUIRE(sql == R"(SELECT "id", "name", "age" FROM "person")");
+}
+
+TEST_CASE("Insert", "[query]") {
+  dialect d;
+  query_builder query(d);
+  const auto sql = query.insert().into("person", {
+    "id", "name", "age"
+  }).values({7UL, "george", 65U}).compile();
+
+  REQUIRE(sql == R"(INSERT INTO "person" ("id", "name", "age") VALUES (7, 'george', 65))");
+}
+
+TEST_CASE("Update", "[query]") {
+  dialect d;
+  query_builder query(d);
+  const auto sql = query.update("person").set({
+    {"id", 7UL},
+    {"name", "george"},
+    {"age", 65U}
+  }).compile();
+
+  REQUIRE(sql == R"(UPDATE "person" SET "id"=7, "name"='george', "age"=65)");
+}
+
+TEST_CASE("Delete", "[query]") {
+  dialect d;
+  query_builder query(d);
+  const auto sql = query.remove().from("person").compile();
+
+  REQUIRE(sql == R"(DELETE FROM "person")");
+}
+
+TEST_CASE("Where", "[query]") {
+  dialect d;
+  query_builder query(d);
+  const auto sql = query.select({"id", "name", "age"})
+                        .from("person")
+                        .where("id"_col == 8)
+                        .compile();
+
+  REQUIRE(sql == R"(SELECT "id", "name", "age" FROM "person" WHERE "id" = 8)");
+}