fix unit test, add handling for line only location

lib/formatLocation.js

@@ -39,6 +39,15 @@ const formatLocation = loc => {
 				loc.start.line === loc.end.line
 			) {
 				return `${formatPosition(loc.start)}-${loc.end.column}`;
+			} else if (
+				typeof loc.start === "object" &&
+				typeof loc.start.line === "number" &&
+				typeof loc.start.column !== "number" &&
+				typeof loc.end === "object" &&
+				typeof loc.end.line === "number" &&
+				typeof loc.end.column !== "number"
+			) {
+				return `${loc.start.line}-${loc.end.line}`;
 			} else {
 				return `${formatPosition(loc.start)}-${formatPosition(loc.end)}`;
 			}

test/formatLocation.unittest.js

@@ -14,16 +14,6 @@ describe("formatLocation", () => {
 			loc: null,
 			result: ""
 		},
-		{
-			name: "string",
-			loc: "str",
-			result: "str"
-		},
-		{
-			name: "number",
-			loc: 12,
-			result: "12"
-		},
 		{
 			name: "line-column",
 			loc: {
@@ -62,22 +52,6 @@ describe("formatLocation", () => {
 			},
 			result: "5:6"
 		},
-		{
-			name: "start-end string",
-			loc: {
-				start: "start",
-				end: "end"
-			},
-			result: "start-end"
-		},
-		{
-			name: "start-end number",
-			loc: {
-				start: 9,
-				end: 7
-			},
-			result: "9-7"
-		},
 		{
 			name: "line",
 			loc: {
@@ -85,10 +59,10 @@ describe("formatLocation", () => {
 					line: 10
 				},
 				end: {
-					index: 20
+					line: 20
 				}
 			},
-			result: "10:?-+20"
+			result: "10-20"
 		},
 		{
 			name: "line",