add various suggestion tests

_testdata/suggestions.json

@@ -1,2 +1,8 @@
 {"message":"suggestion test","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":3}}}, "suggestions": [{"range":{"start":{"line":3}},"text": "func Suggestions() {"}]}
 {"message":"multiline suggestion test","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":3},"end":{"line":4}}}, "suggestions": [{"range":{"start":{"line":3},"end":{"line":4}}, "text": "func Suggestions() {\n// Multiline suggestion!\n} // end of suggestion func"}]}
+{"message":"range suggestion test (replace)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":6,"column":5},"end":{"line":6,"column":7}}}, "suggestions": [{"range":{"start":{"line":6,"column":5},"end":{"line":6,"column":7}}, "text": "14"}]}
+{"message":"range suggestion test (insert)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":7,"column":5},"end":{"line":7,"column":5}}}, "suggestions": [{"range":{"start":{"line":7,"column":5},"end":{"line":7,"column":5}}, "text": "14"}]}
+{"message":"range suggestion test (remove)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":8,"column":5},"end":{"line":8,"column":7}}}, "suggestions": [{"range":{"start":{"line":8,"column":5},"end":{"line":8,"column":7}}, "text": ""}]}
+{"message":"range suggestion test (remove line-break)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":10,"column":5},"end":{"line":11,"column":1}}}, "suggestions": [{"range":{"start":{"line":10,"column":5},"end":{"line":11,"column":1}}, "text": ""}]}
+{"message":"suggestion test (remove line)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":13}}}, "suggestions": [{"range":{"start":{"line":13}}, "text": ""}]}
+{"message":"suggestion test (insert line)","location":{"path":"_testdata/suggestions.txt","range":{"start":{"line":16,"column":1}}}, "suggestions": [{"range":{"start":{"line":16,"column":1}}, "text": "inserted line 1\ninserted line 2\n"}]}

_testdata/suggestions.txt

@@ -2,3 +2,15 @@ package testdata
 
 func suggestions() {
 }
+
+haya13busa (replace)
+hayabusa (insert)
+haya14busa (remove)
+
+--->
+<--- (remove line-break)
+
+remove line
+
+insert line ↓
+insert line ↑