Add MultiStringParser simple test

test/core/parser/parser_test.py

@@ -0,0 +1,28 @@
+"""The Test file for Parsers (Matchable Classes)."""
+
+from sqlfluff.core.parser import (
+    KeywordSegment,
+    MultiStringParser,
+)
+from sqlfluff.core.parser.context import RootParseContext
+
+
+def test__parser__multistringparser_match(generate_test_segments):
+    """Test the MultiStringParser matchable."""
+    parser = MultiStringParser(["foo", "bar"], KeywordSegment)
+    with RootParseContext(dialect=None) as ctx:
+        # Check directly
+        seg_list = generate_test_segments(["foo", "fo"])
+        # Matches when it should
+        assert parser.match(seg_list[:1], parse_context=ctx).matched_segments == (
+            KeywordSegment("foo", seg_list[0].pos_marker),
+        )
+        # Doesn't match when it shouldn't
+        assert parser.match(seg_list[1:], parse_context=ctx).matched_segments == tuple()
+
+
+def test__parser__multistringparser_simple():
+    """Test the MultiStringParser matchable."""
+    parser = MultiStringParser(["foo", "bar"], KeywordSegment)
+    with RootParseContext(dialect=None) as ctx:
+        assert parser.simple(ctx)