Adds test for retrieving path parameters

Author: MaggieKimani1

Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
 using System;
@@ -135,5 +135,22 @@ public void ThrowsInvalidOperationExceptionInCreatePredicateWhenInvalidArguments
             var message2 = Assert.Throws<InvalidOperationException>(() => OpenApiFilterService.CreatePredicate("users.user.ListUser", "users.user")).Message;
             Assert.Equal("Cannot specify both operationIds and tags at the same time.", message2);
         }
+
+        [Theory]
+        [InlineData("reports.getTeamsUserActivityUserDetail-a3f1", null)]
+        [InlineData(null, "reports.Functions")]
+        public void ReturnsPathParametersOnSlicingBasedOnOperationIdsOrTags(string operationIds, string tags)
+        {
+            // Act
+            var predicate = OpenApiFilterService.CreatePredicate(operationIds, tags);
+            var subsetOpenApiDocument = OpenApiFilterService.CreateFilteredDocument(_openApiDocumentMock, predicate);
+
+            // Assert
+            foreach (var pathItem in subsetOpenApiDocument.Paths)
+            {
+                Assert.True(pathItem.Value.Parameters.Any());
+                Assert.Equal(1, pathItem.Value.Parameters.Count);
+            }
+        }
     }
 }

Microsoft.OpenApi.Hidi.Tests/UtilityFiles/OpenApiDocumentMock.cs

@@ -116,6 +116,21 @@ public static OpenApiDocument CreateOpenApiDocument()
                                     }
                                 }
                             }
+                        },
+                        Parameters = new List<OpenApiParameter>
+                        {
+                            {
+                                new OpenApiParameter()
+                                {
+                                    Name = "period",
+                                    In = ParameterLocation.Path,
+                                    Required = true,
+                                    Schema = new OpenApiSchema()
+                                    {
+                                        Type = "string"
+                                    }
+                                }
+                            }
                         }
                     },
                     ["/reports/microsoft.graph.getTeamsUserActivityUserDetail(date={date})"] = new OpenApiPathItem()
@@ -175,7 +190,20 @@ public static OpenApiDocument CreateOpenApiDocument()
                                     }
                                 }
                             }
-                        }
+                        },
+                        Parameters = new List<OpenApiParameter>
+                        {
+                            new OpenApiParameter
+                            {
+                                Name = "period",
+                                In = ParameterLocation.Path,
+                                Required = true,
+                                Schema = new OpenApiSchema()
+                                {
+                                    Type = "string"
+                                }
+                            }
+                        }                                    
                     },
                     ["/users"] = new OpenApiPathItem()
                     {