refactor: rename files to follow Go convention

testdata/string_of_int.go

@@ -0,0 +1,30 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+package fixtures
+
+type A string
+type B = string
+type C int
+type D = uintptr
+
+func StringTest() {
+	var (
+		i int
+		j rune
+		k byte
+		l C
+		m D
+		n = []int{0, 1, 2}
+		o struct{ x int }
+	)
+	const p = 0
+	_ = string(i) // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+	_ = string(j)
+	_ = string(k)
+	_ = string(p)    // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+	_ = A(l)         // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+	_ = B(m)         // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+	_ = string(n[1]) // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+	_ = string(o.x)  // MATCH /dubious conversion of an integer into a string, use strconv.Itoa/
+}