diff --git a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletWebContractTest.kt b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletWebContractTest.kt
index 656ebcc1a6..61ce841117 100644
--- a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletWebContractTest.kt
+++ b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletWebContractTest.kt
@@ -20,7 +20,6 @@
  */
 package com.vitorpamplona.amethyst.commons.napplet
 
-import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
 import kotlin.test.assertContains
 import kotlin.test.assertFalse
@@ -64,16 +63,4 @@ class NappletWebContractTest {
         assertContains(csp, "form-action 'none'")
         assertFalse(csp.contains("'self'"))
     }
-
-    @Test
-    fun shellTemplateKeepsTheOpaqueIframeAndSourceChecks() =
-        runTest {
-            val shell = NappletWebContract.shellHtml().decodeToString()
-
-            assertContains(shell, "sandbox=\"${NappletWebContract.APP_SANDBOX_PLACEHOLDER}\"")
-            assertContains(shell, NappletWebContract.APP_BOOTSTRAP_PLACEHOLDER)
-            assertContains(shell, "e.source !== iframe.contentWindow")
-            assertContains(shell, "iframe.contentWindow.postMessage(msg, '*')")
-            assertFalse(shell.contains("allow-same-origin"))
-        }
 }
diff --git a/commons/src/jvmTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletShellResourceTest.kt b/commons/src/jvmTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletShellResourceTest.kt
new file mode 100644
index 0000000000..43bd4b9159
--- /dev/null
+++ b/commons/src/jvmTest/kotlin/com/vitorpamplona/amethyst/commons/napplet/NappletShellResourceTest.kt
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.napplet
+
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertContains
+import kotlin.test.assertFalse
+
+/**
+ * The shell page's own contents, asserted where the resource can actually be read.
+ *
+ * This lives in `jvmTest` rather than `commonTest` because [NappletWebContract.shellHtml] goes
+ * through Compose Resources, and that reader needs an initialised Android `Context` on the
+ * android target. A host unit test has none, so running this in `commonTest` failed
+ * `:commons:testAndroidHostTest` with `MissingResourceException` while passing `:commons:jvmTest`
+ * — the same assertion, red or green depending only on which target ran it.
+ *
+ * Nothing about the assertions is platform-specific: `shell.html` is one shared file, so reading
+ * it once on the JVM checks its contents everywhere. What is *not* covered here is the Android
+ * resource plumbing itself, which needs a `Context` — an instrumented test, or Robolectric, which
+ * commons does not use.
+ *
+ * The rest of the contract's tests stay in `commonTest` and still run on both targets; they never
+ * touch a resource.
+ */
+class NappletShellResourceTest {
+    @Test
+    fun shellTemplateKeepsTheOpaqueIframeAndSourceChecks() =
+        runTest {
+            val shell = NappletWebContract.shellHtml().decodeToString()
+
+            assertContains(shell, "sandbox=\"${NappletWebContract.APP_SANDBOX_PLACEHOLDER}\"")
+            assertContains(shell, NappletWebContract.APP_BOOTSTRAP_PLACEHOLDER)
+            assertContains(shell, "e.source !== iframe.contentWindow")
+            assertContains(shell, "iframe.contentWindow.postMessage(msg, '*')")
+            assertFalse(shell.contains("allow-same-origin"))
+        }
+}