--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/emsdk/test/test.sh	Thu Jan 22 21:23:17 2026 -0800
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+echo "test the standard workflow (as close as possible to how a user would do it, in the shell)"
+echo "machine: $(uname -m)"
+echo "kernel: $(uname -s)"
+
+set -x
+set -e
+
+# Test that arbitrary (non-released) versions can be installed and
+# activated.
+# This test cannot run on linux-arm64 because only certain binaries
+# get uploaded for this architecture.
+if [[ !($(uname -s) == "Linux" && $(uname -m) == "aarch64") ]]; then
+  ./emsdk install sdk-upstream-1b7f7bc6002a3ca73647f41fc10e1fac7f06f804
+  ./emsdk activate sdk-upstream-1b7f7bc6002a3ca73647f41fc10e1fac7f06f804
+  source ./emsdk_env.sh
+  which emcc
+  emcc -v
+fi
+
+# Install an older version of the SDK that requires EM_CACHE to be
+# set in the environment, so that we can test it is later removed
+# This test only runs on x64 because we didn't build arm binaries
+# when this older version of the SDK was built.
+if [[ $(uname -m) == "x86_64" ]]; then
+  ./emsdk install sdk-1.39.15
+  ./emsdk activate sdk-1.39.15
+  source ./emsdk_env.sh
+  which emcc
+  emcc -v
+  test -n "$EM_CACHE"
+fi
+
+# Install the latest version of the SDK which is the expected precondition
+# of test.py.
+./emsdk install latest
+./emsdk activate latest
+source ./emsdk_env.sh --build=Release
+# Test that EM_CACHE was unset
+test -z "$EM_CACHE"
+
+# On mac and windows python3 should be in the path and point to the
+# bundled version.
+which python3
+which emcc
+emcc -v