add all validator, simplify error messages

all_test.go

@@ -0,0 +1,46 @@
+package validate
+
+import "testing"
+
+func TestAll(t *testing.T) {
+	type TestCase[T any] struct {
+		Input T
+		F     func(T) error
+		Err   error
+	}
+
+	f := All(
+		MinLength(4),
+		MaxLength(8),
+		Chars("0123456789abcdef"),
+		In("abcd", "abcdef", "12345678"),
+	)
+
+	testCases := []TestCase[string]{
+		{Input: "abcd", F: f},
+		{Input: "abcdef", F: f},
+		{Input: "12345678", F: f},
+		{Input: "abc", F: f, Err: ErrTooFewChars},
+		{Input: "abcdef012", F: f, Err: ErrTooManyChars},
+		{Input: "abcdefgh", F: f, Err: ErrDisallowedChars},
+		{Input: "01abcd", F: f, Err: ErrValueNotAllowed},
+	}
+
+	for _, tc := range testCases {
+		t.Logf("%q", tc.Input)
+
+		err := tc.F(tc.Input)
+		if tc.Err != nil {
+			if err == nil {
+				t.Errorf("Expected %s; got nil", tc.Err)
+			}
+			if err != tc.Err {
+				t.Errorf("Expected %s; got %s", tc.Err, err)
+			}
+		} else {
+			if err != nil {
+				t.Errorf("Expected nil; got %s", err)
+			}
+		}
+	}
+}