diff --git a/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.ets b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.ets
new file mode 100644
index 0000000000000000000000000000000000000000..b13df302b5d3a48f7f5f6d7d3f96bbe50a34ae87
--- /dev/null
+++ b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.ets
@@ -0,0 +1,12 @@
+{% for decl in package_declarations %}
+
+/*---
+desc: packages
+assert: "A compile-time error occurs if: a package module contains no package header, or package headers of two package modules in the same package have different identifiers."
+params: "{{decl}}"
+tags: [compile-only, negative]
+---*/
+
+{{decl}}
+
+{% endfor %}
diff --git a/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.params.yaml b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.params.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..4885bfa753e440974bddfe6ede9f977df5d11b49
--- /dev/null
+++ b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/bad_package_declarations.params.yaml
@@ -0,0 +1,5 @@
+package_declarations:
+  - package
+  - |
+    package P1;
+    package P2;
diff --git a/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.ets b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.ets
new file mode 100644
index 0000000000000000000000000000000000000000..1753522e66a0fbfa97afa3cff308634ccb3fa0c6
--- /dev/null
+++ b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.ets
@@ -0,0 +1,12 @@
+{% for decl in package_declarations %}
+
+/*---
+desc: packages
+assert: One or more package modules form a package
+params: "{{decl}}"
+tags: [compile-only]
+---*/
+
+{{decl}}
+
+{% endfor %}
diff --git a/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.params.yaml b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.params.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..a14979634d7f8468089fbe71ecde5f02cabd7aaa
--- /dev/null
+++ b/plugins/ets/tests/ets-templates/17.experimental_features/04.packages/package_declarations.params.yaml
@@ -0,0 +1,10 @@
+package_declarations:
+  - package P1
+  - package P1.A
+  - |
+    package P1
+    import {Uint8Array as Bytes} from 'std/core'
+  - |
+    package P1
+    const MY_PI = Math.PI
+    const MY_E = Math.E