fix(core): add test projects to solution

Add generated test projects to the same solution as the main project
Co-authored-by: Ben Callaghan <bcallaghan@selectbankcard.com>

Author: Ben Callaghan

e2e/core-e2e/tests/nx-dotnet.spec.ts

@@ -304,5 +304,17 @@ describe('nx-dotnet e2e', () => {
       expect(slnFile).toContain(app1);
       expect(slnFile).toContain(app2);
     });
+
+    it('should add test project to same solution as app project', async () => {
+      const app = uniq('app');
+      await runNxCommandAsync(
+        `generate @nx-dotnet/core:app ${app} --language="C#" --template="webapi" --test-template="xunit" --solutionFile`,
+      );
+
+      const slnFile = readFile('proj.nx-dotnet.sln');
+      expect(() => checkFilesExist(`apps/${app}`)).not.toThrow();
+      expect(slnFile).toContain(app);
+      expect(slnFile).toContain(app + '-test');
+    });
   });
 });

packages/core/src/generators/utils/generate-test-project.ts

@@ -8,6 +8,7 @@ import {
   GetLintExecutorConfiguration,
   GetTestExecutorConfig,
 } from '../../models';
+import { addToSolutionFile } from './add-to-sln';
 
 import {
   NormalizedSchema,
@@ -56,6 +57,9 @@ export async function GenerateTestProject(
   }
 
   dotnetClient.new(schema.testTemplate, newParams);
+  if (!isDryRun()) {
+    addToSolutionFile(host, testRoot, dotnetClient, schema.solutionFile);
+  }
 
   if (!isDryRun() && !schema.skipOutputPathManipulation) {
     await manipulateXmlProjectFile(host, {