AK: Get rid of ConstVectorIterator.

We can achieve the same with just a VectorIterator<const Vector, const T>.

AK/Tests/.gitignore

@@ -1,2 +1,5 @@
 TestString
 TestQueue
+TestVector
+*.d
+*.o

AK/Tests/Makefile

@@ -1,4 +1,4 @@
-all: TestString TestQueue
+all: TestString TestQueue TestVector
 
 CXXFLAGS = -std=c++17 -Wall -Wextra
 
@@ -8,5 +8,8 @@ TestString: TestString.cpp ../String.cpp ../StringImpl.cpp ../StringBuilder.cpp
 TestQueue: TestQueue.cpp ../String.cpp ../StringImpl.cpp ../StringBuilder.cpp ../StringView.cpp TestHelpers.h
 	$(CXX) $(CXXFLAGS) -I../ -I../../ -o $@ TestQueue.cpp ../String.cpp ../StringImpl.cpp ../StringBuilder.cpp ../StringView.cpp
 
+TestVector: TestVector.cpp ../String.cpp ../StringImpl.cpp ../StringBuilder.cpp ../StringView.cpp TestHelpers.h
+	$(CXX) $(CXXFLAGS) -I../ -I../../ -o $@ TestVector.cpp ../String.cpp ../StringImpl.cpp ../StringBuilder.cpp ../StringView.cpp
+
 clean:
 	rm -f TestString TestQueue

AK/Tests/TestVector.cpp

@@ -0,0 +1,45 @@
+#include "TestHelpers.h"
+#include <AK/AKString.h>
+#include <AK/Vector.h>
+
+int main()
+{
+    EXPECT(Vector<int>().is_empty());
+    EXPECT(Vector<int>().size() == 0);
+
+    Vector<int> ints;
+    ints.append(1);
+    ints.append(2);
+    ints.append(3);
+    EXPECT_EQ(ints.size(), 3);
+    EXPECT_EQ(ints.take_last(), 3);
+    EXPECT_EQ(ints.size(), 2);
+    EXPECT_EQ(ints.take_last(), 2);
+    EXPECT_EQ(ints.size(), 1);
+    EXPECT_EQ(ints.take_last(), 1);
+    EXPECT_EQ(ints.size(), 0);
+
+    ints.clear();
+    EXPECT_EQ(ints.size(), 0);
+
+    Vector<String> strings;
+    strings.append("ABC");
+    strings.append("DEF");
+
+    int loop_counter = 0;
+    for (const String& string : strings) {
+        EXPECT(!string.is_null());
+        EXPECT(!string.is_empty());
+        ++loop_counter;
+    }
+
+    loop_counter = 0;
+    for (auto& string : (const_cast<const Vector<String>&>(strings))) {
+        EXPECT(!string.is_null());
+        EXPECT(!string.is_empty());
+        ++loop_counter;
+    }
+    EXPECT_EQ(loop_counter, 2);
+
+    return 0;
+}