Added Remove Tests and Remove Methods

FlexArray.Test/FlexArrayStringTests.cs

@@ -180,4 +180,166 @@ public class FlexArrayStringTests
             array[i].Should().Be(i.ToString());
         }
     }
+    
+    // Remove tests
+    [Fact]
+    public void Remove_ByIndex_Simple()
+    {
+        var array = new FlexArrayString();
+        array.Add("Hello");
+
+        array.Count.Should().Be(1);
+        array.RemoveAt(0).Should().BeTrue("index exists");
+        array.Count.Should().Be(0, "count has to be reduced");
+    }
+
+    [Fact]
+    public void Remove_ByIndex_Shifting()
+    {
+        var array = new FlexArrayString();
+        array.Add("Goodbye");
+        array.Add("World");
+        array.Add("!");
+
+        array.Count.Should().Be(3);
+        array.RemoveAt(1).Should().BeTrue();
+        array.Count.Should().Be(2);
+        array[1].Should().Be("!", "items to the right have to be shifted left after removal");
+        array.RemoveAt(2)
+             .Should().BeFalse("not a valid index any longer, despite a value still being there");
+    }
+
+    [Fact]
+    public void Remove_ByIndex_FromEnd()
+    {
+        var array = new FlexArrayString();
+        array.Add("Hello");
+        array.Add("World");
+        array.Add("!");
+
+        array.Count.Should().Be(3);
+        array.RemoveAt(2).Should().BeTrue();
+        array.Count.Should().Be(2);
+        array[1].Should().Be("World");
+    }
+
+    [Fact]
+    public void Remove_ByIndex_Invalid()
+    {
+        var array = new FlexArrayString();
+        array.Add("This is a test!");
+
+        array.RemoveAt(1)
+             .Should().BeFalse("the array is big enough for this index, but no value has been set there");
+        array.Count.Should().Be(1, "unchanged");
+
+        array.RemoveAt(-1)
+             .Should().BeFalse("negative index doesn't make any sense");
+    }
+    
+    [Fact]
+    public void Remove_Single_OneOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("Hello");
+        array.Add("corrupted");
+        array.Add("World!");
+
+        array.Remove("corrupted", true)
+            .Should().BeTrue("element was found");
+        array.Count.Should().Be(2, "element was removed");
+    }
+
+    [Fact]
+    public void Remove_Single_OnlyOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("Hello");
+
+        array.Remove("Hello", true)
+            .Should().BeTrue("element was found");
+        array.Count.Should().Be(0, "element was removed");
+    }
+
+    [Fact] public void Remove_Single_MultipleOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("Ever");
+        array.Add("used");
+        array.Add("kubernetes?");
+        
+        array.Remove("kubernetes?", true)
+            .Should().BeTrue("element was found");
+        array.Count.Should().Be(2, "only one element was removed");
+    }
+
+    [Fact]
+    public void Remove_Single_NotFound()
+    {
+        var array = new FlexArrayString();
+        array.Add("1");
+        array.Add("2");
+        array.Add("3");
+
+        array.Remove("4", true)
+            .Should().BeFalse("element was not found");
+        array.Count.Should().Be(3, "unchanged");
+    }
+
+    [Fact]
+    public void Remove_Multiple_OneOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("1");
+        array.Add("2");
+        array.Add("3");
+
+        array.Remove("2", false)
+            .Should().BeTrue("element was found");
+        array.Count.Should().Be(2, "only one element was removed");
+    }
+
+    [Fact]
+    public void Remove_Multiple_MultipleOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("1");
+        array.Add("2");
+        array.Add("2");
+        array.Add("3");
+        array.Add("2");
+        array.Add("4");
+        array.Add("2");
+
+        array.Remove("2", false)
+            .Should().BeTrue("elements were found");
+        array.Count.Should().Be(3, "four elements were removed");
+    }
+
+    [Fact]
+    public void Remove_Multiple_OnlyOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("1");
+        array.Add("1");
+        array.Add("1");
+
+
+        array.Remove("1", false)
+            .Should().BeTrue("elements were found");
+        array.Count.Should().Be(0, "all elements were removed");
+    }
+
+    [Fact]
+    public void Remove_Multiple_NoOccurrence()
+    {
+        var array = new FlexArrayString();
+        array.Add("1");
+        array.Add("2");
+        array.Add("3");
+
+        array.Remove("4", false)
+            .Should().BeFalse("element was not found");
+        array.Count.Should().Be(3, "unchanged");
+    }
 }