From 78d73f21d1287d4b40a0d98cb9b68eca1f833be2 Mon Sep 17 00:00:00 2001
From: Iarek Kovtunenko <16271112+iarekk@users.noreply.github.com>
Date: Thu, 2 Jul 2026 10:54:25 +0100
Subject: [PATCH] Build solution in PR pipeline before running tests

The PR pipeline ran VSTest against pre-built assemblies in tests\**\bin but never built the solution. On the old persistent MwWilson1EsHostedPool this happened to work because build output lingered between runs; on the Microsoft-hosted windows-2022 pool each run starts clean, so VSTest reported 'No test sources found' and zero unit tests executed.

Add build/template-build.yaml (install wasm-tools workload + 'dotnet msbuild ... -r -t:build' in Release, mirroring the GitHub Actions build) and run it between dependency install and the test steps. Structure follows the MSAL.NET ADO pipeline (discrete DotNetCoreCLI@2 steps); the dotnet-SDK MSBuild is used instead of VSBuild@1 to reliably resolve the net10.0 SDK.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 azure-pipelines.yml       |  1 +
 build/template-build.yaml | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 build/template-build.yaml

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0f611f3cc..b2fcfe3c9 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -16,4 +16,5 @@ jobs:
     - visualstudio
   steps:
     - template: build/template-install-dependencies.yaml
+    - template: build/template-build.yaml
     - template: build/template-run-unit-tests.yaml
diff --git a/build/template-build.yaml b/build/template-build.yaml
new file mode 100644
index 000000000..785dbef2f
--- /dev/null
+++ b/build/template-build.yaml
@@ -0,0 +1,19 @@
+# template-build.yaml
+# Restore and build the solution so that the test assemblies exist before
+# the VSTest steps run. This is required on Microsoft-hosted (ephemeral)
+# agents, which start from a clean workspace with no pre-built output.
+
+steps:
+- task: DotNetCoreCLI@2
+  displayName: 'Install wasm-tools workload'
+  inputs:
+    command: 'custom'
+    custom: 'workload'
+    arguments: 'install wasm-tools'
+
+- task: DotNetCoreCLI@2
+  displayName: 'Build solution (Release)'
+  inputs:
+    command: 'custom'
+    custom: 'msbuild'
+    arguments: 'Microsoft.Identity.Web.sln -r -t:build -verbosity:m -property:Configuration=Release'