Add tests

Author: JustinGrote

src/PowerShellEditorServices/Services/TextDocument/Handlers/CompletionHandler.cs

@@ -455,7 +455,7 @@ private static string GetTypeFilterText(string textToBeReplaced, string completi
         /// <param name="documentation">The remaining text after the type, if any</param>
         /// <param name="label">The label to check for in the documentation prefix</param>
         /// <returns>Whether or not the type was found.</returns>
-        private static bool TryExtractType(string toolTipText, string label, out string type, out string documentation)
+        internal static bool TryExtractType(string toolTipText, string label, out string type, out string documentation)
         {
             MatchCollection matches = s_typeRegex.Matches(toolTipText);
             type = string.Empty;

test/PowerShellEditorServices.Test/Language/CompletionHandlerTests.cs

@@ -126,5 +126,28 @@ public async Task CompletesFilePath()
             Assert.Equal(actual.TextEdit.TextEdit with { NewText = "" }, CompleteFilePath.ExpectedEdit);
             Assert.All(results, r => Assert.True(r.Kind is CompletionItemKind.File or CompletionItemKind.Folder));
         }
+
+        // TODO: These should be an integration tests at a higher level if/when https://github.com/PowerShell/PowerShell/pull/25108 is merged. As of today, we can't actually test this in the PS engine currently.
+        [Fact]
+        public void CanExtractTypeAndDescriptionFromTooltip()
+        {
+            string expectedType = "[string]";
+            string expectedDescription = "Test String";
+            string paramName = "TestParam";
+            string testHelp = $"{expectedType} {paramName} - {expectedDescription}";
+            Assert.True(PsesCompletionHandler.TryExtractType(testHelp, paramName, out string type, out string description));
+            Assert.Equal(expectedType, type);
+            Assert.Equal(expectedDescription, description);
+        }
+
+        [Fact]
+        public void CanExtractTypeFromTooltip()
+        {
+            string expectedType = "[string]";
+            string testHelp = $"{expectedType}";
+            Assert.True(PsesCompletionHandler.TryExtractType(testHelp, string.Empty, out string type, out string description));
+            Assert.Null(description);
+            Assert.Equal(expectedType, type);
+        }
     }
 }