Add test for sourcetext variation

tests/fixtures/sourcetext.json

@@ -0,0 +1,30 @@
+{
+  "key.offset": 0,
+  "key.length": 14,
+  "key.diagnostic_stage": "source.diagnostic.stage.swift.parse",
+  "key.syntaxmap": [
+    {
+      "key.kind": "source.lang.swift.syntaxtype.keyword",
+      "key.offset": 0,
+      "key.length": 6
+    },
+    {
+      "key.kind": "source.lang.swift.syntaxtype.identifier",
+      "key.offset": 7,
+      "key.length": 3
+    }
+  ],
+  "key.substructure": [
+    {
+      "key.kind": "source.lang.swift.decl.struct",
+      "key.accessibility": "source.lang.swift.accessibility.internal",
+      "key.name": "Foo",
+      "key.offset": 0,
+      "key.length": 13,
+      "key.nameoffset": 7,
+      "key.namelength": 3,
+      "key.bodyoffset": 12,
+      "key.bodylength": 0
+    }
+  ]
+}

tests/fixtures/valid_text_request.yaml

@@ -0,0 +1,3 @@
+key.request: source.request.editor.open
+key.name: "example.swift"
+key.sourcetext: "struct Foo {}\n"

tests/test_executable.py

@@ -32,6 +32,12 @@ def test_valid_request(self):
         self.assertEqual(out, open("tests/fixtures/valid.json").read())
         self.assertEqual(err, "")
 
+    def test_text_request(self):
+        code, out, err = run_command("tests/fixtures/valid_text_request.yaml")
+        self.assertEqual(code, 0)
+        self.assertEqual(out, open("tests/fixtures/sourcetext.json").read())
+        self.assertEqual(err, "")
+
     def test_empty_argument(self):
         code, out, err = run_command("")
         self.assertEqual(code, 1)