Add relevant test files

test/PowerShellEditorServices.Test.Shared/Symbols/FindSymbolsInPSDFile.cs

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+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.PowerShell.EditorServices.Test.Shared.Symbols
+{
+    public class FindSymbolsInPSDFile
+    {
+        public static readonly ScriptRegion SourceDetails =
+            new ScriptRegion
+            {
+                File = @"Symbols\PowerShellDataFile.psd1"
+            };
+    }
+}
+

test/PowerShellEditorServices.Test.Shared/Symbols/FindSymbolsInPesterFile.cs

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+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.PowerShell.EditorServices.Test.Shared.Symbols
+{
+    public class FindSymbolsInPesterFile
+    {
+        public static readonly ScriptRegion SourceDetails =
+            new ScriptRegion
+            {
+                File = @"Symbols\PesterFile.tests.ps1"
+            };
+    }
+}
+

test/PowerShellEditorServices.Test.Shared/Symbols/PesterFile.tests.ps1

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+Describe "A dummy test" {
+    Context "When a pester file is given" {
+        It "Should return it symbols" {
+
+        }
+
+        It "Should return context symbols" {
+
+        }
+
+        It "Should return describe symbols" {
+
+        }
+    }
+}

test/PowerShellEditorServices.Test.Shared/Symbols/PowerShellDataFile.psd1

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+@{
+    property1 = "value1"
+    property2 = "value2"
+    property3 = "value3"
+}