refactor: move test name into test class

chapters/chapter_02/include/constexp.h

@@ -5,4 +5,5 @@
 class ConstExpTest : public ChapterTest {
 public:
   virtual void run() override;
+  virtual const char *name() const override { return "Constexpr test"; }
 };

chapters/chapter_02/include/ifswitch.h

@@ -5,4 +5,5 @@
 class IfswitchTest : public ChapterTest {
 public:
   virtual void run() override;
+  virtual const char *name() const override { return "If/switch test"; }
 };

chapters/chapter_02/include/initlist.h

@@ -5,4 +5,5 @@
 class InitListTest : public ChapterTest {
 public:
   virtual void run() override;
+  virtual const char *name() const override { return "Initializer list test"; }
 };

chapters/chapter_02/include/null.h

@@ -5,4 +5,5 @@
 class NullTest : public ChapterTest {
 public:
   virtual void run() override;
+  virtual const char *name() const override { return "Nullptr test"; }
 };

chapters/chapter_02/include/structured_binding.h

@@ -5,4 +5,7 @@
 class StructuredBindingTest : public ChapterTest {
 public:
   virtual void run() override;
+  virtual const char *name() const override {
+    return "Structured binding test";
+  }
 };

chapters/interface/include/chapter_interface.h

@@ -4,4 +4,5 @@ class ChapterTest {
 public:
   virtual ~ChapterTest() = default;
   virtual void run() = 0;
+  virtual const char *name() const = 0;
 };