test/test_pcm_*: use `using` instead of `typedef`

test/test_pcm_export.cxx

@@ -373,7 +373,7 @@ template<SampleFormat F, class Traits=SampleTraits<F>>
 static void
 TestAlsaChannelOrder51()
 {
-	typedef typename Traits::value_type value_type;
+	using value_type = typename Traits::value_type;
 
 	static constexpr value_type src[] = {
 		0, 1, 2, 3, 4, 5,
@@ -403,7 +403,7 @@ template<SampleFormat F, class Traits=SampleTraits<F>>
 static void
 TestAlsaChannelOrder71()
 {
-	typedef typename Traits::value_type value_type;
+	using value_type = typename Traits::value_type;
 
 	static constexpr value_type src[] = {
 		0, 1, 2, 3, 4, 5, 6, 7,

test/test_pcm_interleave.cxx

@@ -68,7 +68,7 @@ TEST(PcmTest, Interleave16)
 
 TEST(PcmTest, Interleave24)
 {
-	typedef uint8_t T;
+	using T = uint8_t;
 	static constexpr T src1[] = { 1, 2, 3, 4, 5, 6 };
 	static constexpr T src2[] = { 7, 8, 9, 10, 11, 12 };
 	static constexpr T src3[] = { 13, 14, 15, 16, 17, 18 };

test/test_pcm_volume.cxx

@@ -33,7 +33,7 @@ template<SampleFormat F, class Traits=SampleTraits<F>,
 static void
 TestVolume(G g=G())
 {
-	typedef typename Traits::value_type value_type;
+	using value_type = typename Traits::value_type;
 
 	PcmVolume pv;
 	EXPECT_EQ(pv.Open(F, false), F);
@@ -80,7 +80,7 @@ TEST(PcmTest, Volume16)
 TEST(PcmTest, Volume16to32)
 {
 	constexpr SampleFormat F = SampleFormat::S16;
-	typedef int16_t value_type;
+	using value_type = int16_t;
 	RandomInt<value_type> g;
 
 	PcmVolume pv;