--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/emsdk/test/test_activation.ps1	Fri Jan 23 22:38:59 2026 -0800
@@ -0,0 +1,88 @@
+# This test installs emsdk and activates the latest toolchain using `--system` or `--permanent` flags,
+# and checks if the environment variables and PATH are correctly updated. Set $env:SYSTEM_FLAG and $env:PERMANENT_FLAG to test each.
+# If no flag is provided the process/shell values are tested. See the CI file for an example.
+
+refreshenv
+
+$repo_root = [System.IO.Path]::GetDirectoryName((resolve-path "$PSScriptRoot"))
+
+$PATH_USER_BEFORE = [System.Environment]::GetEnvironmentVariable("PATH", "User")
+$PATH_MACHINE_BEFORE = [System.Environment]::GetEnvironmentVariable("PATH", "Machine")
+$PATH_Process_BEFORE = [System.Environment]::GetEnvironmentVariable("PATH", "Process")
+
+
+try {
+
+    & "$repo_root/emsdk.ps1" install latest
+
+    & "$repo_root/emsdk.ps1" activate latest $env:PERMANENT_FLAG $env:SYSTEM_FLAG
+
+    if ($env:SYSTEM_FLAG) {
+        $env_type = "Machine"
+    }
+    elseif ($env:PERMANENT_FLAG) {
+        $env_type = "User"
+    } else {
+        $env_type = "Process"
+    }
+
+    $EMSDK = [System.Environment]::GetEnvironmentVariable("EMSDK", $env_type)
+    $EMSDK_NODE = [System.Environment]::GetEnvironmentVariable("EMSDK_NODE", $env_type)
+    $EMSDK_PYTHON = [System.Environment]::GetEnvironmentVariable("EMSDK_PYTHON", $env_type)
+    $PATH = [System.Environment]::GetEnvironmentVariable("PATH", $env_type)
+
+    if (!$EMSDK) {
+        throw "EMSDK is not set for the user"
+    }
+    if (!$EMSDK_NODE) {
+        throw "EMSDK_NODE is not set for the user"
+    }
+    if (!$EMSDK_PYTHON) {
+        throw "EMSDK_PYTHON is not set for the user"
+    }
+
+
+    $path_split = $PATH.Split(';')
+
+    $EMSDK_Path = $path_split | Where-Object { $_ -like "$repo_root*" }
+    if (!$EMSDK_Path) {
+        throw "No path is added!"
+    }
+
+    $EMSDK_UPSTREAM_Path = $path_split | Where-Object { $_ -like "$repo_root\upstream\emscripten*" }
+    if (!$EMSDK_UPSTREAM_Path) {
+        throw "$repo_root\\upstream\emscripten is not added to path."
+    }
+
+
+}
+finally {
+    # Recover pre-split PATH
+    refreshenv
+
+    [Environment]::SetEnvironmentVariable("Path", $PATH_USER_BEFORE, "User")
+    try {
+        [Environment]::SetEnvironmentVariable("Path", $PATH_MACHINE_BEFORE, "Machine")
+    }
+    catch {}
+
+    [Environment]::SetEnvironmentVariable("Path", $PATH_Process_BEFORE, "Process")
+
+    # Recover pre activation env variables
+    [Environment]::SetEnvironmentVariable("EMSDK", $null, "User")
+    [Environment]::SetEnvironmentVariable("EMSDK_NODE", $null, "User")
+    [Environment]::SetEnvironmentVariable("EMSDK_PYTHON", $null, "User")
+
+    try {
+        [Environment]::SetEnvironmentVariable("EMSDK", $null, "Machine")
+        [Environment]::SetEnvironmentVariable("EMSDK_NODE", $null, "Machine")
+        [Environment]::SetEnvironmentVariable("EMSDK_PYTHON", $null, "Machine")
+    } catch {}
+
+
+    [Environment]::SetEnvironmentVariable("EMSDK", $null, "Process")
+    [Environment]::SetEnvironmentVariable("EMSDK_NODE", $null, "Process")
+    [Environment]::SetEnvironmentVariable("EMSDK_PYTHON", $null, "Process")
+
+    refreshenv
+}