Test the input-value-deprecation flag

As requested
#118 (review)

Author: ccouzens

README.md

@@ -31,7 +31,7 @@ $ graphql-schema-diff --help
     --left-schema-header         Header to send to left remote schema source
     --right-schema-header        Header to send to right remote schema source
     --sort-schema, -s            Sort schemas prior to diffing
-    --input-value-deprecation    Include deprecated input value fields   
+    --input-value-deprecation    Include deprecated input value fields when loading from URL
 
   Examples
     $ graphql-schema-diff https://example.com/graphql schema.graphql

src/__tests__/diff.test.ts

@@ -3,6 +3,8 @@ import path from "path";
 import { getDiff } from "../diff";
 import { getIntrospectionQuery, parse, print } from "graphql";
 import introspectionResponse from "./fixtures/introspectionResponse.json";
+import { graphql, buildSchema } from "graphql";
+import fs from "fs/promises";
 
 describe("getDiff", () => {
   describe("remote schema fetching", () => {
@@ -261,4 +263,63 @@ describe("getDiff", () => {
       expect(result).toBeUndefined();
     });
   });
+
+  describe("input arg deprecation", () => {
+    it("introspection misses deprecated input args fields by default", async () => {
+      const localSchemaInputValueDeprecated = path.join(
+        __dirname,
+        "fixtures/localSchemaInputValueDeprecated.graphql",
+      );
+      const testRemoteSchemaLocation = "http://test/graphql";
+      const schema = buildSchema(
+        await fs.readFile(localSchemaInputValueDeprecated, "utf-8"),
+      );
+
+      nock(testRemoteSchemaLocation)
+        .post(/.*/)
+        .reply(200, (_uri, source: { query: string }) => {
+          return graphql({ schema, source: source.query, rootValue: {} });
+        });
+
+      const result = await getDiff(
+        localSchemaInputValueDeprecated,
+        testRemoteSchemaLocation,
+      );
+
+      expect(result).toBeDefined();
+
+      if (result) {
+        expect(result.diff).toContain("+  field1(testInput1: String): String");
+      }
+    });
+
+    it("introspection sees deprecated input args when inputValueDeprecation specified", async () => {
+      const localSchemaInputValueDeprecated = path.join(
+        __dirname,
+        "fixtures/localSchemaInputValueDeprecated.graphql",
+      );
+      const testRemoteSchemaLocation = "http://test/graphql";
+      const schema = buildSchema(
+        await fs.readFile(localSchemaInputValueDeprecated, "utf-8"),
+      );
+
+      nock(testRemoteSchemaLocation)
+        .post(/.*/)
+        .reply(200, (_uri, source: { query: string }) => {
+          return graphql({ schema, source: source.query, rootValue: {} });
+        });
+
+      const result = await getDiff(
+        testRemoteSchemaLocation,
+        localSchemaInputValueDeprecated,
+        { inputValueDeprecation: true },
+      );
+
+      expect(result).toBeUndefined();
+    });
+
+    afterEach(() => {
+      nock.cleanAll();
+    });
+  });
 });

src/__tests__/fixtures/localSchemaInputValueDeprecated.graphql

@@ -0,0 +1,6 @@
+type Query {
+  field1(
+    testInput1: String
+    testInput2: Float @deprecated(reason: "test2 is deprecated")
+  ): String
+}

src/cli.ts

@@ -20,7 +20,7 @@ const cli = meow(
     --left-schema-header \t Header to send to left remote schema source
     --right-schema-header \t Header to send to right remote schema source
     --sort-schema, -s \t\t Sort schemas prior to diffing
-    --input-value-deprecation \t Include deprecated input value fields
+    --input-value-deprecation \t Include deprecated input value fields when loading from URL
 
   Examples
     $ graphql-schema-diff https://example.com/graphql schema.graphql