fix: Avoid throwing an exception when the length of the params list i…

…s zero

src/Loader/YeSqlLoader.cs

@@ -33,20 +33,22 @@ public partial class YeSqlLoader
     /// </summary>
     /// <param name="sqlFiles">The SQL files to load.</param>
     /// <returns>A collection containing the tags with their associated SQL statements.</returns>
-    /// <exception cref="ArgumentNullException"><c>sqlFiles</c> is <c>null</c>.</exception>
+    /// <exception cref="ArgumentNullException">
+    /// <c>sqlFiles</c> is <c>null</c>.
+    /// </exception>
     /// <exception cref="ArgumentException">
     /// One or more files in <paramref name="sqlFiles"/> is null, empty or consists only of white-space characters.
-    /// -or-
-    /// The length of the <paramref name="sqlFiles"/> list is zero.
     /// </exception>
-    /// <exception cref="AggregateException">If the parser and/or loader encounters one or more errors.</exception>
+    /// <exception cref="AggregateException">
+    /// If the parser and/or loader encounters one or more errors.
+    /// </exception>
     public IYeSqlCollection LoadFromFiles(params string[] sqlFiles)
     {
         if (sqlFiles is null)
             throw new ArgumentNullException(nameof(sqlFiles));
 
         if (sqlFiles.IsEmpty())
-            throw new ArgumentException(ExceptionMessages.LengthOfParamsListIsZero);
+            return _parser.SqlStatements;
 
         if (sqlFiles.ContainsNullOrWhiteSpace())
             throw new ArgumentException(string.Format(ExceptionMessages.CollectionHasNullValueOrOnlyWhitespace, nameof(sqlFiles)));
@@ -67,20 +69,22 @@ public IYeSqlCollection LoadFromFiles(params string[] sqlFiles)
     /// </summary>
     /// <param name="directories">A set of directories where the SQL files are located.</param>
     /// <returns>A collection containing the tags with their associated SQL statements.</returns>
-    /// <exception cref="ArgumentNullException"><c>directories</c> is <c>null</c>.</exception>
+    /// <exception cref="ArgumentNullException">
+    /// <c>directories</c> is <c>null</c>.
+    /// </exception>
     /// <exception cref="ArgumentException">
     /// One or more directories in <paramref name="directories"/> is null, empty or consists only of white-space characters.
-    /// -or-
-    /// The length of the <paramref name="directories"/> list is zero.
     /// </exception>
-    /// <exception cref="AggregateException">If the parser and/or loader encounters one or more errors.</exception>
+    /// <exception cref="AggregateException">
+    /// If the parser and/or loader encounters one or more errors.
+    /// </exception>
     public IYeSqlCollection LoadFromDirectories(params string[] directories)
     {
         if (directories is null)
             throw new ArgumentNullException(nameof(directories));
 
         if (directories.IsEmpty())
-            throw new ArgumentException(ExceptionMessages.LengthOfParamsListIsZero);
+            return _parser.SqlStatements;
 
         if(directories.ContainsNullOrWhiteSpace())
             throw new ArgumentException(string.Format(ExceptionMessages.CollectionHasNullValueOrOnlyWhitespace, nameof(directories)));

src/Models/ExceptionMessages.cs

@@ -18,5 +18,4 @@ internal class ExceptionMessages
     public const string DuplicateTagName                        = "The given tag '{0}' is duplicated.";
     public const string TagIsEmptyOrWhitespace                  = "The tag name is empty.";
     public const string LineIsNotAssociatedWithAnyTag           = "'{0}' line is not associated with any tag.";
-    public const string LengthOfParamsListIsZero                = "The length of the params list is zero.";
 }

tests/Loader/YeSqlLoaderTests.Directories.cs

@@ -147,18 +147,15 @@ public void LoadFromDirectories_WhenDirectoryNotExists_ShouldThrowAggregateExcep
     }
 
     [Test]
-    public void LoadFromDirectories_WhenParamsListIsZero_ShouldThrowArgumentException()
+    public void LoadFromDirectories_WhenParamsListIsZero_ShouldNotThrowException()
     {
         // Arrange
         var loader = new YeSqlLoader();
-        var expectedMessage = ExceptionMessages.LengthOfParamsListIsZero;
 
         // Act
-        Action action = () => loader.LoadFromDirectories();
+        var sqlStatements = loader.LoadFromDirectories();
 
         // Assert
-        action.Should()
-              .Throw<ArgumentException>()
-              .WithMessage(expectedMessage);
+        sqlStatements.Should().BeEmpty();
     }
 }

tests/Loader/YeSqlLoaderTests.Files.cs

@@ -155,18 +155,15 @@ public void LoadFromFiles_WhenCollectionHasNullValueOrOnlyWhitespace_ShouldThrow
     }
 
     [Test]
-    public void LoadFromFiles_WhenParamsListIsZero_ShouldThrowArgumentException()
+    public void LoadFromFiles_WhenParamsListIsZero_ShouldNotThrowException()
     {
         // Arrange
         var loader = new YeSqlLoader();
-        var expectedMessage = ExceptionMessages.LengthOfParamsListIsZero;
 
         // Act
-        Action action = () => loader.LoadFromFiles();
+        var sqlStatements = loader.LoadFromFiles();
 
         // Assert
-        action.Should()
-              .Throw<ArgumentException>()
-              .WithMessage(expectedMessage);
+        sqlStatements.Should().BeEmpty();
     }
 }