snapshot of https://github.com/mattermost/mattermost.git (master, 2026-09-16; blobs > 131072B omitted)

tools/mattermost-govet/emptyStrCmp/testdata/src/a/a.go

@@ -0,0 +1,96 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package a
+
+// Valid: idiomatic empty string comparisons
+func validEmptyStringChecks() {
+	var s string
+
+	// Valid: direct comparison with empty string
+	if s == "" {
+		// This is idiomatic
+	}
+
+	if s != "" {
+		// This is idiomatic
+	}
+
+	str := "hello"
+	if str == "" {
+		// This is idiomatic
+	}
+
+	if str != "" {
+		// This is idiomatic
+	}
+}
+
+// Invalid: using len for empty string checks
+func invalidEmptyStringChecks() {
+	var s string
+
+	// Invalid: len(s) == 0
+	if len(s) == 0 { // want "calling len\\(s\\) == 0 where s is string, please use s == \\\"\\\" instead"
+		// Should use s == "" instead
+	}
+
+	// Invalid: len(s) != 0
+	if len(s) != 0 { // want "calling len\\(s\\) != 0 where s is string, please use s != \\\"\\\" instead"
+		// Should use s != "" instead
+	}
+
+	str := "hello"
+
+	// Invalid: len(str) == 0
+	if len(str) == 0 { // want "calling len\\(s\\) == 0 where s is string, please use s == \\\"\\\" instead"
+		// Should use str == "" instead
+	}
+
+	// Invalid: len(str) != 0
+	if len(str) != 0 { // want "calling len\\(s\\) != 0 where s is string, please use s != \\\"\\\" instead"
+		// Should use str != "" instead
+	}
+
+	// Invalid: len(s) > 0
+	if len(s) > 0 { // want "calling len\\(s\\) > 0 where s is string, please use s != \\\"\\\" instead"
+		// Should use s != "" instead
+	}
+
+	// Invalid: len(s) <= 0
+	if len(s) <= 0 { // want "calling len\\(s\\) <= 0 where s is string, please use s == \\\"\\\" instead"
+		// Should use s == "" instead
+	}
+}
+
+// Valid: len for non-zero comparisons
+func validLenComparisons() {
+	s := "hello"
+
+	// Valid: comparing length to non-zero values
+	if len(s) == 5 {
+		// This is fine
+	}
+
+	if len(s) > 5 {
+		// This is fine
+	}
+
+	if len(s) < 10 {
+		// This is fine
+	}
+}
+
+// Valid: len for slices
+func validSliceLenComparisons() {
+	slice := []int{1, 2, 3}
+
+	// Valid: len on slices (not strings)
+	if len(slice) == 0 {
+		// This is acceptable for slices
+	}
+
+	if len(slice) != 0 {
+		// This is acceptable for slices
+	}
+}