arena: clean up tests. (pingcap#1150)

util/arena/arena_test.go

@@ -24,62 +24,44 @@ func TestSimpleArenaAllocator(t *testing.T) {
 		t.Error("off not match, expect 10 bug got", arena.off)
 	}
 
-	if len(slice) != 0 {
-		t.Error("slice len not match, expect 0 bug got", len(slice))
-	}
-
-	if cap(slice) != 10 {
-		t.Error("slice len not match, expect 10 bug got", cap(slice))
+	if len(slice) != 0 || cap(slice) != 10 {
+		t.Error("slice length or cap not match")
 	}
 
 	slice = arena.Alloc(20)
 	if arena.off != 30 {
 		t.Error("off not match, expect 30 bug got", arena.off)
 	}
 
-	if len(slice) != 0 {
-		t.Error("slice len not match, expect 0 bug got", len(slice))
-	}
-
-	if cap(slice) != 20 {
-		t.Error("slice len not match, expect 20 bug got", cap(slice))
+	if len(slice) != 0 || cap(slice) != 20 {
+		t.Error("slice length or cap not match")
 	}
 
 	slice = arena.Alloc(1024)
-
 	if arena.off != 30 {
 		t.Error("off not match, expect 30 bug got", arena.off)
 	}
 
-	if len(slice) != 0 {
-		t.Error("slice len not match, expect 0 bug got", len(slice))
-	}
-
-	if cap(slice) != 1024 {
-		t.Error("slice len not match, expect 1024 bug got", cap(slice))
+	if len(slice) != 0 || cap(slice) != 1024 {
+		t.Error("slice length or cap not match")
 	}
 
 	slice = arena.AllocWithLen(2, 10)
-
 	if arena.off != 40 {
 		t.Error("off not match, expect 40 bug got", arena.off)
 	}
 
-	if len(slice) != 2 {
-		t.Error("slice len not match, expect 2 bug got", len(slice))
-	}
-
-	if cap(slice) != 10 {
-		t.Error("slice len not match, expect 10 bug got", cap(slice))
+	if len(slice) != 2 || cap(slice) != 10 {
+		t.Error("slice length or cap not match")
 	}
 
 	arena.Reset()
 	if arena.off != 0 || cap(arena.arena) != 1000 {
-		t.Error("off should be 0")
+		t.Error("off or cap not match")
 	}
 
 	if cap(arena.arena) != 1000 {
-		t.Error("off should be 0")
+		t.Error("cap not match")
 	}
 }