testdata: move map growth test to map.go

Author: dgryski

main_test.go

@@ -57,7 +57,6 @@ func TestBuild(t *testing.T) {
 		"json.go",
 		"map.go",
 		"math.go",
-		"mapgrowth.go",
 		"print.go",
 		"reflect.go",
 		"slice.go",

testdata/map.go

@@ -126,6 +126,8 @@ func main() {
 	println("tested growing of a map")
 
 	floatcmplx()
+
+	mapgrow()
 }
 
 func floatcmplx() {
@@ -205,3 +207,67 @@ func testBigMap(squares map[int]int, n int) {
 		}
 	}
 }
+
+func mapgrow() {
+	m := make(map[int]int)
+
+	const (
+		Delete = 500
+		N      = Delete * 2
+	)
+
+	for i := 0; i < Delete; i++ {
+		m[i] = i
+	}
+
+	var deleted bool
+	for k, v := range m {
+		if k == 0 {
+			// grow map
+			for i := Delete; i < N; i++ {
+				m[i] = i
+			}
+
+			// delete some elements
+			for i := 0; i < Delete; i++ {
+				delete(m, i)
+			}
+			deleted = true
+			continue
+		}
+
+		// make sure we never see a deleted element later in our iteration
+		if deleted && v < Delete {
+			println("saw deleted element", v)
+		}
+	}
+
+	if len(m) != N-Delete {
+		println("bad length post grow/delete", len(m))
+	}
+
+	seen := make([]bool, 500)
+
+	var mcount int
+	for k, v := range m {
+		if k != v {
+			println("element mismatch", k, v)
+		}
+		if k < Delete {
+			println("saw deleted element post-grow", k)
+		}
+		seen[v-Delete] = true
+		mcount++
+	}
+
+	for _, v := range seen {
+		if !v {
+			println("missing key", v)
+		}
+	}
+
+	if mcount != N-Delete {
+		println("bad number of elements post-grow:", mcount)
+	}
+	println("done")
+}

testdata/map.txt

@@ -79,3 +79,4 @@ tested growing of a map
 2
 2
 2
+done