next integration tests (#1712)

* move integration tests pyscriptjs/tests/integration ->pyscript.core/tests/integration

* add information in regards to how to run integration tests to README

* fix fake server build paths

* fix paths to build and run tests. The change of path before integration tests is a glitch maybe due to pytest cache?

* remove test files created by mistake

* update readme with latest changes

---------

Co-authored-by: Fabio Pliger <fpliger@anaconda.com>

pyscript.core/tests/integration/test_importmap.py

@@ -0,0 +1,66 @@
+import pytest
+
+from .support import PyScriptTest
+
+
+@pytest.mark.xfail(reason="See PR #938")
+class TestImportmap(PyScriptTest):
+    def test_importmap(self):
+        src = """
+            export function say_hello(who) {
+                console.log("hello from", who);
+            }
+        """
+        self.writefile("mymod.js", src)
+        #
+        self.pyscript_run(
+            """
+            <script type="importmap">
+            {
+              "imports": {
+                "mymod": "/mymod.js"
+              }
+            }
+            </script>
+
+            <script type="module">
+                import { say_hello } from "mymod";
+                say_hello("JS");
+            </script>
+
+            <py-script>
+                import mymod
+                mymod.say_hello("Python")
+            </py-script>
+            """
+        )
+        assert self.console.log.lines == [
+            "hello from JS",
+            "hello from Python",
+        ]
+
+    def test_invalid_json(self):
+        self.pyscript_run(
+            """
+            <script type="importmap">
+            this is not valid JSON
+            </script>
+
+            <py-script>
+                print("hello world")
+            </py-script>
+            """,
+            wait_for_pyscript=False,
+        )
+        # this error is raised by the browser itself, when *it* tries to parse
+        # the import map
+        self.check_js_errors("Failed to parse import map")
+
+        self.wait_for_pyscript()
+        assert self.console.log.lines == [
+            "hello world",
+        ]
+        # this warning is shown by pyscript, when *we* try to parse the import
+        # map
+        banner = self.page.locator(".py-warning")
+        assert "Failed to parse import map" in banner.inner_text()