diff --git a/test/function_view.cpp b/test/function_view.cpp
new file mode 100644
index 0000000..ff95f46
--- /dev/null
+++ b/test/function_view.cpp
@@ -0,0 +1,123 @@
+#include <function2/function2.hpp>
+#include <stdplus/function_view.hpp>
+
+#include <functional>
+
+#include <gtest/gtest.h>
+
+namespace stdplus
+{
+
+int add(int a, int b)
+{
+    return a + b;
+}
+
+int mul(int a, int b) noexcept
+{
+    return a * b;
+}
+
+struct Funcy
+{
+    int a = 0;
+
+    int operator()(float y) noexcept
+    {
+        return a += (int)y;
+    }
+
+    int operator()(int b) noexcept
+    {
+        return a += b;
+    }
+};
+
+struct FuncyPriv : private Funcy
+{
+    using Funcy::operator();
+};
+
+int callFv(stdplus::function_view<int(int, int)> fv)
+{
+    return fv(3, 5);
+}
+
+TEST(FunctionView, Ptr)
+{
+    function_view<int(int, int)> fv = add;
+    EXPECT_EQ(3, fv(1, 2));
+    EXPECT_EQ(14, fv(5, 9));
+    fv = mul;
+    EXPECT_EQ(14, fv(7, 2));
+    EXPECT_EQ(0, fv(0, 10));
+    function_view fv2 = add;
+    EXPECT_EQ(1, fv2(1, 0));
+
+    EXPECT_EQ(8, callFv(add));
+}
+
+TEST(FunctionView, Obj)
+{
+    Funcy f;
+    function_view<int(int)> fv = f;
+    EXPECT_EQ(2, fv(2));
+    EXPECT_EQ(5, fv(3));
+
+    FuncyPriv fp;
+    fv = fp;
+    EXPECT_EQ(2, fv(2));
+    EXPECT_EQ(5, fv(3));
+}
+
+TEST(FunctionView, Lambda)
+{
+    auto addl = [](int a, int b) { return a + b; };
+    function_view<int(int, int)> fv = addl;
+    EXPECT_EQ(3, fv(1, 2));
+    EXPECT_EQ(14, fv(5, 9));
+    function_view fv2 = addl;
+    EXPECT_EQ(1, fv2(1, 0));
+    fv = fv2;
+    EXPECT_EQ(1, fv(1, 0));
+    function_view<int(int, int) const> fv3 = addl;
+    EXPECT_EQ(1, fv3(1, 0));
+
+    auto mull = [old = 1](int a) mutable { return old *= a; };
+    function_view fvm = mull;
+    EXPECT_EQ(2, fvm(2));
+    EXPECT_EQ(4, fvm(2));
+
+    auto mula = [](auto a, auto b) { return a + b; };
+    fv = mula;
+    EXPECT_EQ(5, fv(3, 2));
+
+    EXPECT_EQ(8, callFv([](auto a, auto b) { return a + b; }));
+}
+
+TEST(FunctionView, StdFunction)
+{
+    std::function<int(int, int)> addf = add;
+    function_view<int(int, int)> fv = addf;
+    EXPECT_EQ(3, fv(1, 2));
+    EXPECT_EQ(14, fv(5, 9));
+    {
+        function_view fv2 = addf;
+        EXPECT_EQ(1, fv2(1, 0));
+        fv = fv2;
+    }
+    EXPECT_EQ(6, fv(3, 3));
+
+    fu2::unique_function<int(int, int) const noexcept> mulf = mul;
+    function_view<int(int, int) const> fv2 = mulf;
+    EXPECT_EQ(2, fv2(1, 2));
+
+    fu2::unique_function<int(int)> mulfa = [old = 1](auto a) mutable {
+        return old *= a;
+    };
+    function_view<int(int)> fva = mulfa;
+    EXPECT_EQ(3, fva(3));
+    EXPECT_EQ(9, fva(3));
+}
+
+} // namespace stdplus
diff --git a/test/meson.build b/test/meson.build
index fd62657..40ac624 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -1,6 +1,7 @@
 gtests = {
   'cancel': [stdplus_dep, gtest_main_dep],
   'exception': [stdplus_dep, gtest_main_dep],
+  'function_view': [stdplus_dep, gtest_main_dep],
   'handle/copyable': [stdplus_dep, gtest_main_dep],
   'handle/managed': [stdplus_dep, gtest_main_dep],
   'hash': [stdplus_dep, gtest_main_dep],