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ArrayEnumeratorTest.cs
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ArrayEnumeratorTest.cs
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using System;
using System.Collections.Generic;
using Xunit;
using ModuleManager.Collections;
namespace ModuleManagerTests.Collections
{
public class ArrayEnumeratorTest
{
[Fact]
public void Test__Constructor__ArrayNull()
{
ArgumentNullException ex = Assert.Throws<ArgumentNullException>(delegate
{
new ArrayEnumerator<string>(null);
});
Assert.Equal("array", ex.ParamName);
}
[Fact]
public void Test__Constructor__StartIndex__Negative()
{
string[] arr = { "abc", "def", "ghi" };
ArgumentException ex = Assert.Throws<ArgumentException>(delegate
{
new ArrayEnumerator<string>(arr, -1);
});
Assert.Equal("startIndex", ex.ParamName);
Assert.Contains("must be non-negative (got -1)", ex.Message);
}
[Fact]
public void Test__Constructor__StartIndex__TooLarge()
{
string[] arr = { "abc", "def", "ghi" };
ArgumentException ex = Assert.Throws<ArgumentException>(delegate
{
new ArrayEnumerator<string>(arr, 4);
});
Assert.Equal("startIndex", ex.ParamName);
Assert.Contains("must be less than or equal to array length (array length 3, startIndex 4)", ex.Message);
}
[Fact]
public void Test__Constructor__Length__Negative()
{
string[] arr = { "abc", "def", "ghi" };
ArgumentException ex = Assert.Throws<ArgumentException>(delegate
{
new ArrayEnumerator<string>(arr, 1, -1);
});
Assert.Equal("length", ex.ParamName);
Assert.Contains("must be non-negative (got -1)", ex.Message);
}
[Fact]
public void Test__Constructor__Length__TooLong()
{
string[] arr = { "abc", "def", "ghi" };
ArgumentException ex = Assert.Throws<ArgumentException>(delegate
{
new ArrayEnumerator<string>(arr, 1, 3);
});
Assert.Equal("length", ex.ParamName);
Assert.Contains("must fit within the string (array length 3, startIndex 1, length 3)", ex.Message);
}
[Fact]
public void TestArrayEnumerator()
{
string[] arr = { "abc", "def", "ghi" };
IEnumerator<string> enumerator = new ArrayEnumerator<string>(arr);
Assert.True(enumerator.MoveNext());
Assert.Equal("abc", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("def", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("ghi", enumerator.Current);
Assert.False(enumerator.MoveNext());
}
[Fact]
public void TestArrayEnumerator__Reset()
{
string[] arr = { "abc", "def" };
IEnumerator<string> enumerator = new ArrayEnumerator<string>(arr);
Assert.True(enumerator.MoveNext());
Assert.Equal("abc", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("def", enumerator.Current);
Assert.False(enumerator.MoveNext());
enumerator.Reset();
Assert.True(enumerator.MoveNext());
Assert.Equal("abc", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("def", enumerator.Current);
Assert.False(enumerator.MoveNext());
}
[Fact]
public void TestArrayEnumerator__Empty()
{
string[] arr = new string[0];
IEnumerator<string> enumerator = new ArrayEnumerator<string>(arr);
Assert.False(enumerator.MoveNext());
}
[Fact]
public void TestArrayEnumerator__StartIndex()
{
string[] arr = { "abc", "def", "ghi" };
IEnumerator<string> enumerator = new ArrayEnumerator<string>(arr, 1);
Assert.True(enumerator.MoveNext());
Assert.Equal("def", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("ghi", enumerator.Current);
Assert.False(enumerator.MoveNext());
}
[Fact]
public void TestArrayEnumerator__StartIndex__Length()
{
string[] arr = { "abc", "def", "ghi", "jkl" };
IEnumerator<string> enumerator = new ArrayEnumerator<string>(arr, 1, 2);
Assert.True(enumerator.MoveNext());
Assert.Equal("def", enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal("ghi", enumerator.Current);
Assert.False(enumerator.MoveNext());
}
}
}