diff --git a/tests/scripts/ci.py b/tests/scripts/ci.py
index 1ffd2d20e7ae..022d19200232 100755
--- a/tests/scripts/ci.py
+++ b/tests/scripts/ci.py
@@ -372,12 +372,14 @@ def fn(
         if precheck is not None:
             precheck()
 
+        build_dir = get_build_dir(name)
+
         if skip_build:
             scripts = []
         else:
             scripts = [
-                f"./tests/scripts/task_config_build_{name}.sh {get_build_dir(name)}",
-                f"./tests/scripts/task_build.py --build-dir {get_build_dir(name)}",
+                f"./tests/scripts/task_config_build_{name}.sh {build_dir}",
+                f"./tests/scripts/task_build.py --build-dir {build_dir}",
             ]
 
         if post_build is not None:
@@ -394,7 +396,7 @@ def fn(
         # Add named test suites
         for option_name, (_, extra_scripts) in options.items():
             if kwargs.get(option_name, False):
-                scripts += extra_scripts
+                scripts.extend(script.format(build_dir=build_dir) for script in extra_scripts)
 
         docker(
             name=gen_name(f"ci-{name}"),
@@ -553,7 +555,7 @@ def add_subparser(
     return subparser
 
 
-CPP_UNITTEST = ("run c++ unitests", ["./tests/scripts/task_cpp_unittest.sh"])
+CPP_UNITTEST = ("run c++ unitests", ["./tests/scripts/task_cpp_unittest.sh {build_dir}"])
 
 generated = [
     generate_command(
@@ -610,7 +612,10 @@ def add_subparser(
     generate_command(
         name="wasm",
         help="Run WASM build and test(s)",
-        options={"test": ("run WASM tests", ["./tests/scripts/task_web_wasm.sh"])},
+        options={
+            "cpp": CPP_UNITTEST,
+            "test": ("run WASM tests", ["./tests/scripts/task_web_wasm.sh"]),
+        },
     ),
     generate_command(
         name="qemu",
diff --git a/tests/scripts/task_cpp_unittest.sh b/tests/scripts/task_cpp_unittest.sh
index a28efb0328ec..8ae2e9b1109f 100755
--- a/tests/scripts/task_cpp_unittest.sh
+++ b/tests/scripts/task_cpp_unittest.sh
@@ -18,6 +18,16 @@
 
 set -euxo pipefail
 
+if [ $# -gt 0 ]; then
+    BUILD_DIR="$1"
+elif [ -n "${TVM_BUILD_PATH:-}" ]; then
+    # TVM_BUILD_PATH may contain multiple space-separated paths.  If
+    # so, use the first one.
+    BUILD_DIR=$(IFS=" "; set -- $TVM_BUILD_PATH; echo $1)
+else
+    BUILD_DIR=build
+fi
+
 # Python is required by apps/bundle_deploy
 source tests/scripts/setup-pytest-env.sh
 
@@ -32,16 +42,17 @@ export OMP_NUM_THREADS=1
 # Build cpptest suite
 python3 tests/scripts/task_build.py \
     --sccache-bucket tvm-sccache-prod \
-    --cmake-target cpptest
+    --cmake-target cpptest \
+    --build-dir "${BUILD_DIR}"
 
 # crttest requires USE_MICRO to be enabled, which is currently the case
 # with all CI configs
-pushd build
+pushd "${BUILD_DIR}"
 ninja crttest
 popd
 
 
-pushd build
+pushd "${BUILD_DIR}"
 ctest --gtest_death_test_style=threadsafe
 popd