diff --git a/server/tests/python_tests/test_def_symbols.py b/server/tests/python_tests/test_def_symbols.py
new file mode 100644
index 0000000..b7afc86
--- /dev/null
+++ b/server/tests/python_tests/test_def_symbols.py
@@ -0,0 +1,200 @@
+"""Completion of .def block templates and addresses from PSC DefinedEvents."""
+
+import itertools
+from pathlib import Path
+
+import lsprotocol.types as lsp  # type: ignore
+from pygls.workspace import Workspace
+
+import lsp_server
+from lsp_tclserver import TclLanguageServer
+from tools.def_symbols import parse_def_symbols
+from tools.file_sourcing import psc_defined_event_files
+
+PSC = """<?xml version="1.0" encoding="UTF-8"?>
+<Configuration>
+  <Sourcing><Sequence>
+    <Layer Name="Service" SubFolder="service">
+      <Scripts><Filename Name="service"/></Scripts>
+      <DefinedEvents><Filename Name="service" Processing="auto"/></DefinedEvents>
+    </Layer>
+    <Layer Name="Empty"><DefinedEvents/></Layer>
+  </Sequence></Sourcing>
+</Configuration>
+"""
+
+DEF = """MACHINE Default
+
+FORMATTING
+{
+	ADDRESS SPOS
+	{
+		FORMAT      Coordinate
+	}
+	ADDRESS X {
+	}
+\tBLOCK_TEMPLATE external_subprogram
+\t{
+\t\tText[$lib_spf(value,subprogram_output_name)]
+\t}
+\tBLOCK_TEMPLATE steady_rest
+\t{
+\t\tText[M60]
+\t}
+#\tBLOCK_TEMPLATE commented_out
+}
+"""
+
+
+def _project(tmp_path: Path, monkeypatch):
+    (tmp_path / "service").mkdir()
+    psc = tmp_path / "post.psc"
+    psc.write_text(PSC, encoding="utf-8")
+    (tmp_path / "service" / "service.def").write_text(DEF, encoding="utf-8")
+    (tmp_path / "service" / "service.tcl").write_text("proc svc {} {}\n", encoding="utf-8")
+
+    server = TclLanguageServer(name="block-template-test", version="1", max_workers=1)
+    server.protocol._workspace = Workspace(  # pylint: disable=protected-access
+        root_uri=tmp_path.as_uri(),
+        sync_kind=lsp.TextDocumentSyncKind.Incremental,
+        workspace_folders=[lsp.WorkspaceFolder(uri=tmp_path.as_uri(), name="root")],
+        position_encoding=lsp.PositionEncodingKind.Utf16,
+    )
+    monkeypatch.setattr(lsp_server, "LSP_SERVER", server)
+    server.refresh_psc_scripts([tmp_path])
+    return server, psc
+
+
+_versions = itertools.count(1)
+
+
+def _complete(server, tmp_path: Path, source: str, trigger: str | None = None):
+    uri = (tmp_path / "caller.tcl").as_uri()
+    # A new version per request, the server caches lines by (uri, version).
+    server.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=uri, language_id="tcl", version=next(_versions), text=source)
+    )
+    lines = source.split("\n")
+    context = None
+    if trigger is not None:
+        context = lsp.CompletionContext(
+            trigger_kind=lsp.CompletionTriggerKind.TriggerCharacter,
+            trigger_character=trigger,
+        )
+    result = lsp_server.on_completion(
+        lsp.CompletionParams(
+            text_document=lsp.TextDocumentIdentifier(uri=uri),
+            position=lsp.Position(line=len(lines) - 1, character=len(lines[-1])),
+            context=context,
+        )
+    )
+    return sorted(result.items, key=lambda item: item.sort_text or "")
+
+
+def test_parse_def_symbols_ignores_comments():
+    symbols = parse_def_symbols(DEF)
+    assert symbols.block_templates == ("external_subprogram", "steady_rest")
+    assert symbols.addresses == ("SPOS", "X")
+
+
+def test_psc_defined_event_files_resolve_def_paths(tmp_path, monkeypatch):
+    _, psc = _project(tmp_path, monkeypatch)
+    assert psc_defined_event_files(psc) == [(tmp_path / "service" / "service.def").resolve()]
+
+
+def test_mom_do_template_offers_templates_then_variables_on_space(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    items = _complete(server, tmp_path, "set globalValue 1\nMOM_do_template ", trigger=" ")
+    labels = [item.label for item in items]
+    assert labels[:2] == ["external_subprogram", "steady_rest"]
+    assert items[0].detail == "Block template (service.def)"
+    variable = next(item for item in items if item.label == "globalValue")
+    assert variable.insert_text == "$globalValue"
+    assert "svc" not in labels
+
+
+def test_mom_do_template_ranks_templates_before_variables(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    items = _complete(server, tmp_path, "set globalValue 1\nMOM_do_template st")
+    labels = [item.label for item in items]
+    assert labels[:2] == ["external_subprogram", "steady_rest"]
+    assert "globalValue" in labels
+
+
+def test_mom_do_template_dollar_still_completes_variables(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    items = _complete(server, tmp_path, "set globalValue 1\nMOM_do_template $glob")
+    labels = {item.label for item in items}
+    assert "globalValue" in labels
+    assert "steady_rest" not in labels
+
+
+def test_def_change_refreshes_block_templates(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    def_file = tmp_path / "service" / "service.def"
+    def_file.write_text("BLOCK_TEMPLATE new_block\n{\n}\n", encoding="utf-8")
+    lsp_server.did_change_watched_files(lsp.DidChangeWatchedFilesParams(changes=[
+        lsp.FileEvent(uri=def_file.as_uri(), type=lsp.FileChangeType.Changed)]))
+    assert [item.label for item in server.block_template_items()] == ["new_block"]
+    assert server.address_items() == []
+
+
+def test_mom_ask_address_value_offers_addresses_then_variables(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    items = _complete(server, tmp_path, "set globalValue 1\nMOM_ask_address_value ", trigger=" ")
+    labels = [item.label for item in items]
+    assert labels[:2] == ["SPOS", "X"]
+    assert items[0].detail == "Address (service.def)"
+    assert "globalValue" in labels
+    assert "steady_rest" not in labels
+
+
+def test_mom_force_and_suppress_offer_mode_or_variable_then_addresses(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    for command in ("MOM_force", "MOM_suppress"):
+        items = _complete(server, tmp_path, f"set globalValue 1\n{command} ", trigger=" ")
+        labels = [item.label for item in items]
+        assert set(labels[:3]) == {"Always", "Once", "Off"}
+        variable = next(item for item in items if item.label == "globalValue")
+        assert variable.insert_text == "$globalValue"
+        assert "SPOS" not in labels
+
+        for source in (f"{command} Once ", f"{command} Always SPOS "):
+            labels = [item.label for item in _complete(server, tmp_path, source, trigger=" ")]
+            assert labels[:2] == ["SPOS", "X"]
+            assert "Once" not in labels
+
+
+def _edit(items, label):
+    item = next(item for item in items if item.label == label)
+    return item.text_edit.new_text, (item.text_edit.range.start.character, item.text_edit.range.end.character)
+
+
+def test_def_symbols_and_modes_are_inserted_quoted(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    source = "MOM_do_template st"
+    assert _edit(_complete(server, tmp_path, source), "steady_rest") == ('"steady_rest"', (16, 18))
+    source = "MOM_force "
+    assert _edit(_complete(server, tmp_path, source, trigger=" "), "Once") == ('"Once"', (10, 10))
+    source = "MOM_force Once SP"
+    assert _edit(_complete(server, tmp_path, source), "SPOS") == ('"SPOS"', (15, 17))
+
+
+def test_typed_quotes_are_replaced_not_doubled(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    # Opening quote typed by the user.
+    source = 'MOM_ask_address_value "SP'
+    assert _edit(_complete(server, tmp_path, source), "SPOS") == ('"SPOS"', (22, 25))
+    # Closing quote inserted by the editor after the cursor.
+    uri = (tmp_path / "caller.tcl").as_uri()
+    source = 'MOM_ask_address_value "SP"'
+    server.workspace.put_text_document(
+        lsp.TextDocumentItem(uri=uri, language_id="tcl", version=next(_versions), text=source)
+    )
+    items = lsp_server.on_completion(
+        lsp.CompletionParams(
+            text_document=lsp.TextDocumentIdentifier(uri=uri),
+            position=lsp.Position(line=0, character=25),
+        )
+    ).items
+    assert _edit(items, "SPOS") == ('"SPOS"', (22, 26))
diff --git a/server/tests/python_tests/test_format_uplevel.py b/server/tests/python_tests/test_format_uplevel.py
new file mode 100644
index 0000000..3532b7c
--- /dev/null
+++ b/server/tests/python_tests/test_format_uplevel.py
@@ -0,0 +1,33 @@
+"""Formatting of uplevel bodies."""
+
+from tclint.format import FormatterOpts
+from tools.formatter import NxFormatter
+from tools.parser import CustomParser
+
+
+def _format(source: str) -> str:
+    formatter = NxFormatter(
+        FormatterOpts(
+            indent="\t",
+            spaces_in_braces=False,
+            balanced_spaces_in_braces=False,
+            max_blank_lines=500,
+            indent_namespace_eval=True,
+            indent_mixed_tab_size=0,
+            emacs=False,
+            debug_whitespace=False,
+        )
+    )
+    return formatter.format_top(source, CustomParser())
+
+
+def test_uplevel_body_is_indented():
+    source = "proc a {} {\n\tuplevel #0 {\n\tset x 1\n\t\tset y 2\n   }\n}\n"
+    assert _format(source) == "proc a {} {\n\tuplevel #0 {\n\t\tset x 1\n\t\tset y 2\n\t}\n}\n"
+
+
+def test_uplevel_without_level_and_with_variable_level():
+    source = "uplevel {\nset x 1\n}\nuplevel $lvl {\nset y 2\n}\nuplevel set z 3\n"
+    assert _format(source) == (
+        "uplevel {\n\tset x 1\n}\nuplevel $lvl {\n\tset y 2\n}\nuplevel set z 3\n"
+    )