diff --git a/tests/test_class_sh_basic.cpp b/tests/test_class_sh_basic.cpp
index fb1de946e..4457aa819 100644
--- a/tests/test_class_sh_basic.cpp
+++ b/tests/test_class_sh_basic.cpp
@@ -14,7 +14,7 @@ struct atyp { // Short for "any type".
     atyp() : mtxt("DefaultConstructor") {}
     atyp(const std::string &mtxt_) : mtxt(mtxt_) {}
     atyp(const atyp &other) { mtxt = other.mtxt + "_CpCtor"; }
-    atyp(atyp &&other) { mtxt = other.mtxt + "_MvCtor"; }
+    atyp(atyp &&other) noexcept { mtxt = other.mtxt + "_MvCtor"; }
 };
 
 struct uconsumer { // unique_ptr consumer
@@ -37,7 +37,7 @@ atyp&       rtrn_mref() { static atyp obj; obj.mtxt = "rtrn_mref"; return obj; }
 atyp const* rtrn_cptr() { return new atyp{"rtrn_cptr"}; }
 atyp*       rtrn_mptr() { return new atyp{"rtrn_mptr"}; }
 
-std::string pass_valu(atyp obj)        { return "pass_valu:" + obj.mtxt; }
+std::string pass_valu(atyp obj)        { return "pass_valu:" + obj.mtxt; } // NOLINT
 std::string pass_cref(atyp const& obj) { return "pass_cref:" + obj.mtxt; }
 std::string pass_mref(atyp& obj)       { return "pass_mref:" + obj.mtxt; }
 std::string pass_cptr(atyp const* obj) { return "pass_cptr:" + obj->mtxt; }
@@ -46,8 +46,8 @@ std::string pass_mptr(atyp* obj)       { return "pass_mptr:" + obj->mtxt; }
 std::shared_ptr<atyp>       rtrn_shmp() { return std::shared_ptr<atyp      >(new atyp{"rtrn_shmp"}); }
 std::shared_ptr<atyp const> rtrn_shcp() { return std::shared_ptr<atyp const>(new atyp{"rtrn_shcp"}); }
 
-std::string pass_shmp(std::shared_ptr<atyp>       obj) { return "pass_shmp:" + obj->mtxt; }
-std::string pass_shcp(std::shared_ptr<atyp const> obj) { return "pass_shcp:" + obj->mtxt; }
+std::string pass_shmp(std::shared_ptr<atyp>       obj) { return "pass_shmp:" + obj->mtxt; } // NOLINT
+std::string pass_shcp(std::shared_ptr<atyp const> obj) { return "pass_shcp:" + obj->mtxt; } // NOLINT
 
 std::unique_ptr<atyp>       rtrn_uqmp() { return std::unique_ptr<atyp      >(new atyp{"rtrn_uqmp"}); }
 std::unique_ptr<atyp const> rtrn_uqcp() { return std::unique_ptr<atyp const>(new atyp{"rtrn_uqcp"}); }
@@ -77,7 +77,7 @@ const std::unique_ptr<atyp> &unique_ptr_cref_roundtrip(const std::unique_ptr<aty
 
 struct SharedPtrStash {
     std::vector<std::shared_ptr<const atyp>> stash;
-    void Add(std::shared_ptr<const atyp> obj) { stash.push_back(obj); }
+    void Add(const std::shared_ptr<const atyp> &obj) { stash.push_back(obj); }
 };
 
 } // namespace class_sh_basic
diff --git a/tests/test_class_sh_inheritance.cpp b/tests/test_class_sh_inheritance.cpp
index 1c825d7f0..1ecb991e6 100644
--- a/tests/test_class_sh_inheritance.cpp
+++ b/tests/test_class_sh_inheritance.cpp
@@ -15,10 +15,10 @@ struct base_template {
     int base_id;
 
     // Some compilers complain about implicitly defined versions of some of the following:
-    base_template(const base_template &) = default;
-    base_template(base_template &&)      = default;
+    base_template(const base_template &)     = default;
+    base_template(base_template &&) noexcept = default;
     base_template &operator=(const base_template &) = default;
-    base_template &operator=(base_template &&) = default;
+    base_template &operator=(base_template &&) noexcept = default;
 };
 
 using base = base_template<100>;
@@ -37,8 +37,8 @@ inline int pass_cptr_drvd(drvd const *d) { return d->id() + 12; }
 inline std::shared_ptr<drvd> rtrn_shmp_drvd()         { return std::shared_ptr<drvd>(new drvd); }
 inline std::shared_ptr<base> rtrn_shmp_drvd_up_cast() { return std::shared_ptr<drvd>(new drvd); }
 
-inline int pass_shcp_base(std::shared_ptr<base const> b) { return b->id() + 21; }
-inline int pass_shcp_drvd(std::shared_ptr<drvd const> d) { return d->id() + 22; }
+inline int pass_shcp_base(const std::shared_ptr<base const>& b) { return b->id() + 21; }
+inline int pass_shcp_drvd(const std::shared_ptr<drvd const>& d) { return d->id() + 22; }
 // clang-format on
 
 using base1 = base_template<110>;
diff --git a/tests/test_class_sh_trampoline_basic.cpp b/tests/test_class_sh_trampoline_basic.cpp
index 935dafd94..48351c153 100644
--- a/tests/test_class_sh_trampoline_basic.cpp
+++ b/tests/test_class_sh_trampoline_basic.cpp
@@ -16,10 +16,10 @@ struct Abase {
     virtual int Add(int other_val) const = 0;
 
     // Some compilers complain about implicitly defined versions of some of the following:
-    Abase(const Abase &) = default;
-    Abase(Abase &&)      = default;
+    Abase(const Abase &)     = default;
+    Abase(Abase &&) noexcept = default;
     Abase &operator=(const Abase &) = default;
-    Abase &operator=(Abase &&) = default;
+    Abase &operator=(Abase &&) noexcept = default;
 };
 
 template <int SerNo>
diff --git a/tests/test_class_sh_trampoline_self_life_support.cpp b/tests/test_class_sh_trampoline_self_life_support.cpp
index ddbceaad4..ffcea710f 100644
--- a/tests/test_class_sh_trampoline_self_life_support.cpp
+++ b/tests/test_class_sh_trampoline_self_life_support.cpp
@@ -8,24 +8,25 @@
 
 #include <memory>
 #include <string>
+#include <utility>
 
 namespace {
 
 struct Big5 { // Also known as "rule of five".
     std::string history;
 
-    explicit Big5(std::string history_start) : history{history_start} {}
+    explicit Big5(std::string history_start) : history{std::move(history_start)} {}
 
     Big5(const Big5 &other) { history = other.history + "_CpCtor"; }
 
-    Big5(Big5 &&other) { history = other.history + "_MvCtor"; }
+    Big5(Big5 &&other) noexcept { history = other.history + "_MvCtor"; }
 
     Big5 &operator=(const Big5 &other) {
         history = other.history + "_OpEqLv";
         return *this;
     }
 
-    Big5 &operator=(Big5 &&other) {
+    Big5 &operator=(Big5 &&other) noexcept {
         history = other.history + "_OpEqRv";
         return *this;
     }
diff --git a/tests/test_class_sh_trampoline_shared_ptr_cpp_arg.cpp b/tests/test_class_sh_trampoline_shared_ptr_cpp_arg.cpp
index b6e2517b4..41dace8e2 100644
--- a/tests/test_class_sh_trampoline_shared_ptr_cpp_arg.cpp
+++ b/tests/test_class_sh_trampoline_shared_ptr_cpp_arg.cpp
@@ -2,8 +2,10 @@
 // All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#include "pybind11_tests.h"
+#include <utility>
+
 #include "pybind11/smart_holder.h"
+#include "pybind11_tests.h"
 
 namespace {
 
@@ -16,7 +18,7 @@ struct SpBase {
     // returns true if there's an associated python instance
     bool has_python_instance() {
         auto tinfo = py::detail::get_type_info(typeid(SpBase));
-        return (bool)py::detail::get_object_handle(this, tinfo);
+        return (bool) py::detail::get_object_handle(this, tinfo);
     }
 
     SpBase()               = default;
@@ -30,13 +32,11 @@ struct PySpBase : SpBase {
 
 struct SpBaseTester {
     std::shared_ptr<SpBase> get_object() const { return m_obj; }
-    void set_object(std::shared_ptr<SpBase> obj) { m_obj = obj; }
+    void set_object(std::shared_ptr<SpBase> obj) { m_obj = std::move(obj); }
     bool is_base_used() { return m_obj->is_base_used(); }
-    bool has_instance() { return (bool)m_obj; }
+    bool has_instance() { return (bool) m_obj; }
     bool has_python_instance() { return m_obj && m_obj->has_python_instance(); }
-    void set_nonpython_instance() {
-        m_obj = std::make_shared<SpBase>();
-    }
+    void set_nonpython_instance() { m_obj = std::make_shared<SpBase>(); }
     std::shared_ptr<SpBase> m_obj;
 };