Share the example scalar coercion adapter across suites

The whole-repo CI run failed coverage because two identical copies of
`ExampleScalarCoercionAdapter` (one per gem suite) shared the same
relative require path, so only one of them ever loaded and the other
reported 0% coverage. Moving the adapter into `spec_support/lib` leaves
a single copy that every suite loads from the same require path, which
also preserves the extension loader's same-path guarantee that the
prior commit relied on.

Author: jwils

elasticgraph-json_ingestion/spec/support/example_extensions/scalar_coercion_adapter.rb

@@ -209,10 +209,11 @@ def grouping_missing_value_placeholder_for(mapping_type, **json_schema_options)
           end
 
           def scalar_coercion_adapter_path
-            # Must match the `defined_at` path used by other specs (e.g. in `elasticgraph-schema_definition`)
-            # that load this adapter: the extension loader raises if the same extension is loaded from two
-            # different paths within one process, as can happen when one worker runs both suites.
-            "support/example_extensions/scalar_coercion_adapter"
+            # The adapter lives in `spec_support` so that every suite which loads it (e.g. this one and
+            # `elasticgraph-schema_definition`) uses the same require path: the extension loader raises
+            # if the same extension is loaded from two different paths within one process, as can happen
+            # when one worker runs multiple suites.
+            "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
           end
 
           def build_api

elasticgraph-json_ingestion/spec/unit/elastic_graph/json_ingestion/schema_definition/schema_elements/scalar_type_extension_spec.rb

@@ -21,13 +21,13 @@ module SchemaDefinition
         metadata = scalar_type_metadata_for "BigInt" do |s|
           s.scalar_type "BigInt" do |t|
             t.mapping type: "long"
-            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "support/example_extensions/scalar_coercion_adapter"
+            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
           end
         end
 
         expect(metadata).to eq scalar_type_with(coercion_adapter_ref: {
           "name" => "ExampleScalarCoercionAdapter",
-          "require_path" => "support/example_extensions/scalar_coercion_adapter"
+          "require_path" => "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
         })
       end
 
@@ -51,7 +51,7 @@ module SchemaDefinition
             t.mapping type: "long"
 
             expect {
-              t.coerce_with "NotAValidConstant", defined_at: "support/example_extensions/scalar_coercion_adapter"
+              t.coerce_with "NotAValidConstant", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
             }.to raise_error NameError, a_string_including("NotAValidConstant")
           end
         end
@@ -79,14 +79,14 @@ module SchemaDefinition
         metadata = scalar_type_metadata_for "Int" do |s|
           s.on_built_in_types do |t|
             if t.is_a?(SchemaElements::ScalarType)
-              t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "support/example_extensions/scalar_coercion_adapter"
+              t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
             end
           end
         end
 
         expect(metadata.coercion_adapter_ref).to eq({
           "name" => "ExampleScalarCoercionAdapter",
-          "require_path" => "support/example_extensions/scalar_coercion_adapter"
+          "require_path" => "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
         })
       end
 
@@ -191,7 +191,7 @@ module SchemaDefinition
 
           it "infers 'NaN' for safe integer type #{int_type} with custom coercion adapter" do
             grouping_missing_value_placeholder = grouping_missing_value_placeholder_for(int_type) do |t|
-              t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "support/example_extensions/scalar_coercion_adapter"
+              t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
             end
 
             expect(grouping_missing_value_placeholder).to eq(MISSING_NUMERIC_PLACEHOLDER)
@@ -200,15 +200,15 @@ module SchemaDefinition
 
         it "does not infer a placeholder for `long` types since core ElasticGraph cannot know their range is float-safe" do
           grouping_missing_value_placeholder = grouping_missing_value_placeholder_for("long") do |t|
-            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "support/example_extensions/scalar_coercion_adapter"
+            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
           end
 
           expect(grouping_missing_value_placeholder).to be_nil
         end
 
         it "does not infer a placeholder for `unsigned_long` types since core ElasticGraph cannot know their range is float-safe" do
           grouping_missing_value_placeholder = grouping_missing_value_placeholder_for("unsigned_long") do |t|
-            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "support/example_extensions/scalar_coercion_adapter"
+            t.coerce_with "ExampleScalarCoercionAdapter", defined_at: "elastic_graph/spec_support/example_extensions/scalar_coercion_adapter"
           end
 
           expect(grouping_missing_value_placeholder).to be_nil

elasticgraph-schema_definition/spec/support/example_extensions/scalar_coercion_adapter.rb

@@ -0,0 +1,20 @@
+# Copyright 2024 - 2026 Block, Inc.
+#
+# Use of this source code is governed by an MIT-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/MIT.
+#
+# frozen_string_literal: true
+
+# This example adapter is shared by multiple gem suites (e.g. `elasticgraph-schema_definition`
+# and `elasticgraph-json_ingestion`). It must live in `spec_support` (rather than being
+# duplicated under each gem's `spec/support`) so that every suite loads it from the same
+# require path: the extension loader raises if the same extension is loaded from two
+# different paths within one process, as can happen when one worker runs multiple suites.
+class ExampleScalarCoercionAdapter
+  def self.coerce_input(value, ctx)
+  end
+
+  def self.coerce_result(value, ctx)
+  end
+end