23 fix only whitespaces + conditional attributes

backend/service/functions/string.go

@@ -1,15 +1,13 @@
 package functions
 
-import "unicode"
+import "strings"
 
-// check if course is empty or contains only whitespaces
+// check if string is empty or contains only whitespaces
 func OnlyWhitespace(word string) bool {
-	for _, letter := range word {
-		if !unicode.IsSpace(letter) || !(letter == int32(160)) {
-			return false
-		}
+	if len(strings.TrimSpace(word)) == 0 {
+		return true
 	}
-	return true
+	return false
 }
 
 func Contains(s []string, e string) bool {

backend/service/functions/string_test.go

@@ -0,0 +1,33 @@
+package functions
+
+import "testing"
+
+func TestOnlyWhitespace(t *testing.T) {
+	type args struct {
+		word string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{"empty string", args{""}, true},
+		{"whitespace", args{" "}, true},
+		{"whitespaces", args{"   "}, true},
+		{"whitespaces and tabs", args{"   \t"}, true},
+		{"whitespaces and tabs and newlines", args{"   \t\n"}, true},
+		{"whitespaces and tabs and newlines and non-breaking spaces", args{"   \t\n\u00A0"}, true},
+		{"non-whitespace", args{"a"}, false},
+		{"non-whitespaces", args{"abc"}, false},
+		{"non-whitespaces and tabs", args{"abc\t"}, false},
+		{"non-whitespaces and tabs and newlines", args{"abc\t\n"}, false},
+		{"non-whitespaces and tabs and newlines and non-breaking spaces", args{"abc\t\n\u00A0"}, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := OnlyWhitespace(tt.args.word); got != tt.want {
+				t.Errorf("OnlyWhitespace() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}