Equal & Len assert better messages

Author: lainio

assert/assert.go

@@ -147,7 +147,11 @@ var (
 )
 
 const (
-	assertionMsg      = "assertion violation"
+	assertionMsg         = "assertion violation"
+	assertionEqualMsg    = "assert equal"
+	assertionNotEqualMsg = "assert not equal"
+	assertionLenMsg      = "assert len"
+
 	gotWantFmt        = ": got '%v', want '%v'"
 	gotWantLongerFmt  = ": got '%v', should be longer than '%v'"
 	gotWantShorterFmt = ": got '%v', should be shorter than '%v'"
@@ -438,7 +442,7 @@ func MNotNil[M ~map[T]U, T comparable, U any](m M, a ...any) {
 // assert violation message.
 func NotEqual[T comparable](val, want T, a ...any) {
 	if want == val {
-		doShouldNotBeEqual(val, want, a)
+		doShouldNotBeEqual(assertionNotEqualMsg, val, want, a)
 	}
 }
 
@@ -450,17 +454,17 @@ func NotEqual[T comparable](val, want T, a ...any) {
 // are used to override the auto-generated assert violation message.
 func Equal[T comparable](val, want T, a ...any) {
 	if want != val {
-		doShouldBeEqual(val, want, a)
+		doShouldBeEqual(assertionEqualMsg, val, want, a)
 	}
 }
 
-func doShouldBeEqual[T comparable](val, want T, a []any) {
-	defMsg := fmt.Sprintf(assertionMsg+gotWantFmt, val, want)
+func doShouldBeEqual[T comparable](aname string, val, want T, a []any) {
+	defMsg := fmt.Sprintf(aname+gotWantFmt, val, want)
 	current().reportAssertionFault(1, defMsg, a)
 }
 
-func doShouldNotBeEqual[T comparable](val, want T, a []any) {
-	defMsg := fmt.Sprintf(assertionMsg+": got '%v' want (!= '%v')", val, want)
+func doShouldNotBeEqual[T comparable](aname string, val, want T, a []any) {
+	defMsg := fmt.Sprintf(aname+": got '%v' want (!= '%v')", val, want)
 	current().reportAssertionFault(1, defMsg, a)
 }
 
@@ -492,7 +496,11 @@ func DeepEqual(val, want any, a ...any) {
 //	assert.DeepEqual(pubKey, ed25519.PublicKey(pubKeyBytes))
 func NotDeepEqual(val, want any, a ...any) {
 	if reflect.DeepEqual(val, want) {
-		defMsg := fmt.Sprintf(assertionMsg+": got '%v', want (!= '%v')", val, want)
+		defMsg := fmt.Sprintf(
+			assertionMsg+": got '%v', want (!= '%v')",
+			val,
+			want,
+		)
 		current().reportAssertionFault(0, defMsg, a)
 	}
 }
@@ -511,7 +519,7 @@ func Len(obj string, length int, a ...any) {
 	l := len(obj)
 
 	if l != length {
-		doShouldBeEqual(l, length, a)
+		doShouldBeEqual(assertionLenMsg, l, length, a)
 	}
 }
 
@@ -575,7 +583,7 @@ func SLen[S ~[]T, T any](obj S, length int, a ...any) {
 	l := len(obj)
 
 	if l != length {
-		doShouldBeEqual(l, length, a)
+		doShouldBeEqual(assertionLenMsg, l, length, a)
 	}
 }
 
@@ -629,7 +637,7 @@ func MLen[M ~map[T]U, T comparable, U any](obj M, length int, a ...any) {
 	l := len(obj)
 
 	if l != length {
-		doShouldBeEqual(l, length, a)
+		doShouldBeEqual(assertionLenMsg, l, length, a)
 	}
 }
 
@@ -683,7 +691,7 @@ func CLen[C ~chan T, T any](obj C, length int, a ...any) {
 	l := len(obj)
 
 	if l != length {
-		doShouldBeEqual(l, length, a)
+		doShouldBeEqual(assertionLenMsg, l, length, a)
 	}
 }
 
@@ -728,7 +736,11 @@ func CShorter[C ~chan T, T any](obj C, length int, a ...any) {
 //
 // Note that when [Plain] asserter is used ([SetDefault]), optional arguments
 // are used to override the auto-generated assert violation message.
-func MKeyExists[M ~map[T]U, T comparable, U any](obj M, key T, a ...any) (val U) {
+func MKeyExists[M ~map[T]U, T comparable, U any](
+	obj M,
+	key T,
+	a ...any,
+) (val U) {
 	var ok bool
 	val, ok = obj[key]
 

assert/assert_test.go

@@ -82,7 +82,7 @@ func ExampleEqual() {
 	}
 	err := sample([]byte{1, 2})
 	fmt.Printf("%v", err)
-	// Output: sample: assert_test.go:80: ExampleEqual.func1(): assertion violation: got '2', want '3'
+	// Output: sample: assert_test.go:80: ExampleEqual.func1(): assert equal: got '2', want '3'
 }
 
 func ExampleSLen() {
@@ -94,7 +94,7 @@ func ExampleSLen() {
 	}
 	err := sample([]byte{1, 2})
 	fmt.Printf("%v", err)
-	// Output: sample: assert_test.go:92: ExampleSLen.func1(): assertion violation: got '2', want '3'
+	// Output: sample: assert_test.go:92: ExampleSLen.func1(): assert len: got '2', want '3'
 }
 
 func ExampleSNotEmpty() {