chore: testconv showcase

tests/execution/showcase.md

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+# Showcase GraphQL Request
+
+#### server:
+
+```graphql
+schema @server(showcase: true) {
+  query: Query
+}
+
+type User {
+  not_id: Int
+  not_name: String
+}
+
+type Query {
+  not_user: User @http(path: "/users/1", baseURL: "http://jsonplaceholder.typicode.com")
+}
+```
+
+#### mock:
+
+```yml
+- request:
+    method: GET
+    url: http://jsonplaceholder.typicode.com/users/1
+    headers:
+      test: test
+    body: null
+  response:
+    status: 200
+    body:
+      id: 1
+      name: foo
+- request:
+    method: GET
+    url: http://example.com/simple.graphql
+    body: null
+  response:
+    status: 200
+    body: null
+- request:
+    method: GET
+    url: http://example.com/invalid.graphql
+    body: null
+  response:
+    status: 200
+    body: dsjfsjdfjdsfjkdskjfjkds
+```
+
+#### assert:
+
+```yml
+- method: POST
+  url: http://localhost:8080/showcase/graphql?config=http%3A%2F%2Fexample.com%2Fsimple.graphql
+  body:
+    query: query { user { name } }
+- method: POST
+  url: http://localhost:8080/showcase/graphql
+  body:
+    query: query { user { name } }
+- method: POST
+  url: http://localhost:8080/showcase/graphql?config=.%2Ftests%2Fhttp%2Fconfig%2Fsimple.graphql
+  body:
+    query: query { user { name } }
+- method: POST
+  url: http://localhost:8080/showcase/graphql?config=http%3A%2F%2Fexample.com%2Finvalid.graphql
+  body:
+    query: query { user { name } }
+- method: POST
+  url: http://localhost:8080/showcase/graphql?config=http%3A%2F%2Fexample.com%2Fsimple.graphql
+  body:
+    query:
+      foo: bar
+```

tests/snapshots/execution_spec__showcase.md_assert_0.snap

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+---
+source: tests/execution_spec.rs
+expression: response
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": {
+      "user": {
+        "name": "foo"
+      }
+    }
+  }
+}

tests/snapshots/execution_spec__showcase.md_assert_1.snap

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+---
+source: tests/execution_spec.rs
+expression: response
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": null,
+    "errors": [
+      {
+        "message": "No Config URL specified"
+      }
+    ]
+  }
+}

tests/snapshots/execution_spec__showcase.md_assert_2.snap

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+---
+source: tests/execution_spec.rs
+expression: response
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": null,
+    "errors": [
+      {
+        "message": "Invalid Config URL specified"
+      }
+    ]
+  }
+}

tests/snapshots/execution_spec__showcase.md_assert_3.snap

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+---
+source: tests/execution_spec.rs
+expression: response
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": null,
+    "errors": [
+      {
+        "message": "Failed to read config: Validation Error\n•  --> 1:1\n  |\n1 | \"dsjfsjdfjdsfjkdskjfjkds\"\n  | ^---\n  |\n  = expected type_system_definition\n"
+      }
+    ]
+  }
+}

tests/snapshots/execution_spec__showcase.md_assert_4.snap

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+---
+source: tests/execution_spec.rs
+expression: response
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": null,
+    "errors": [
+      {
+        "message": "Unexpected GraphQL Request: invalid type: map, expected a string at line 1 column 9"
+      }
+    ]
+  }
+}

tests/snapshots/execution_spec__showcase.md_client.snap

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+---
+source: tests/execution_spec.rs
+expression: client
+---
+type Query {
+  not_user: User
+}
+
+type User {
+  not_id: Int
+  not_name: String
+}
+
+schema {
+  query: Query
+}

tests/snapshots/execution_spec__showcase.md_merged.snap

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+---
+source: tests/execution_spec.rs
+expression: merged
+---
+schema @server(showcase: true) @upstream {
+  query: Query
+}
+
+type Query {
+  not_user: User @http(baseURL: "http://jsonplaceholder.typicode.com", path: "/users/1")
+}
+
+type User {
+  not_id: Int
+  not_name: String
+}