feat: add p/demo/uassert & p/demo/urequire (gnolang#928)

Addresses gnolang#923 
Addresses gnolang#777

---------

Signed-off-by: Manfred Touron <[email protected]>
Signed-off-by: moul <[email protected]>

examples/gno.land/p/demo/ownable/gno.mod

@@ -1 +1,6 @@
 module gno.land/p/demo/ownable
+
+require (
+	gno.land/p/demo/testutils v0.0.0-latest
+	gno.land/p/demo/uassert v0.0.0-latest
+)

examples/gno.land/p/demo/ownable/ownable_test.gno

@@ -3,11 +3,14 @@ package ownable
 import (
 	"std"
 	"testing"
+
+	"gno.land/p/demo/testutils"
+	"gno.land/p/demo/uassert"
 )
 
 var (
-	firstCaller  = std.Address("g1l9aypkr8xfvs82zeux486ddzec88ty69lue9de")
-	secondCaller = std.Address("g127jydsh6cms3lrtdenydxsckh23a8d6emqcvfa")
+	firstCaller  = testutils.TestAddress("first")
+	secondCaller = testutils.TestAddress("second")
 )
 
 func TestNew(t *testing.T) {
@@ -16,18 +19,14 @@ func TestNew(t *testing.T) {
 
 	o := New()
 	got := o.Owner()
-	if firstCaller != got {
-		t.Fatalf("Expected %s, got: %s", firstCaller, got)
-	}
+	uassert.Equal(t, firstCaller, got)
 }
 
 func TestNewWithAddress(t *testing.T) {
 	o := NewWithAddress(firstCaller)
 
 	got := o.Owner()
-	if firstCaller != got {
-		t.Fatalf("Expected %s, got: %s", firstCaller, got)
-	}
+	uassert.Equal(t, firstCaller, got)
 }
 
 func TestOwner(t *testing.T) {
@@ -36,9 +35,7 @@ func TestOwner(t *testing.T) {
 	o := New()
 	expected := firstCaller
 	got := o.Owner()
-	if expected != got {
-		t.Fatalf("Expected %s, got: %s", expected, got)
-	}
+	uassert.Equal(t, expected, got)
 }
 
 func TestTransferOwnership(t *testing.T) {
@@ -47,14 +44,10 @@ func TestTransferOwnership(t *testing.T) {
 	o := New()
 
 	err := o.TransferOwnership(secondCaller)
-	if err != nil {
-		t.Fatalf("TransferOwnership failed, %v", err)
-	}
+	uassert.NoError(t, err, "TransferOwnership failed")
 
 	got := o.Owner()
-	if secondCaller != got {
-		t.Fatalf("Expected: %s, got: %s", secondCaller, got)
-	}
+	uassert.Equal(t, secondCaller, got)
 }
 
 func TestCallerIsOwner(t *testing.T) {
@@ -67,9 +60,7 @@ func TestCallerIsOwner(t *testing.T) {
 	std.TestSetOrigCaller(unauthorizedCaller) // TODO(bug): should not be needed
 
 	err := o.CallerIsOwner()
-	if err == nil {
-		t.Fatalf("Expected %s to not be owner", unauthorizedCaller)
-	}
+	uassert.Error(t, err) // XXX: IsError(..., unauthorizedCaller)
 }
 
 func TestDropOwnership(t *testing.T) {
@@ -78,14 +69,10 @@ func TestDropOwnership(t *testing.T) {
 	o := New()
 
 	err := o.DropOwnership()
-	if err != nil {
-		t.Fatalf("DropOwnership failed, %v", err)
-	}
+	uassert.NoError(t, err, "DropOwnership failed")
 
 	owner := o.Owner()
-	if owner != "" {
-		t.Fatalf("Expected owner to be empty, not %s", owner)
-	}
+	uassert.Empty(t, owner, "owner should be empty")
 }
 
 // Errors
@@ -100,14 +87,10 @@ func TestErrUnauthorized(t *testing.T) {
 	std.TestSetOrigCaller(secondCaller) // TODO(bug): should not be needed
 
 	err := o.TransferOwnership(firstCaller)
-	if err != ErrUnauthorized {
-		t.Fatalf("Should've been ErrUnauthorized, was %v", err)
-	}
+	uassert.ErrorContains(t, err, ErrUnauthorized.Error())
 
 	err = o.DropOwnership()
-	if err != ErrUnauthorized {
-		t.Fatalf("Should've been ErrUnauthorized, was %v", err)
-	}
+	uassert.ErrorContains(t, err, ErrUnauthorized.Error())
 }
 
 func TestErrInvalidAddress(t *testing.T) {
@@ -116,12 +99,8 @@ func TestErrInvalidAddress(t *testing.T) {
 	o := New()
 
 	err := o.TransferOwnership("")
-	if err != ErrInvalidAddress {
-		t.Fatalf("Should've been ErrInvalidAddress, was %v", err)
-	}
+	uassert.ErrorContains(t, err, ErrInvalidAddress.Error())
 
 	err = o.TransferOwnership("10000000001000000000100000000010000000001000000000")
-	if err != ErrInvalidAddress {
-		t.Fatalf("Should've been ErrInvalidAddress, was %v", err)
-	}
+	uassert.ErrorContains(t, err, ErrInvalidAddress.Error())
 }

examples/gno.land/p/demo/uassert/doc.gno

@@ -0,0 +1 @@
+package uassert // import "gno.land/p/demo/uassert"

examples/gno.land/p/demo/uassert/gno.mod

@@ -0,0 +1 @@
+module gno.land/p/demo/uassert

examples/gno.land/p/demo/uassert/helpers.gno

@@ -0,0 +1,51 @@
+package uassert
+
+import "strings"
+
+func fail(t TestingT, customMsgs []string, failureMessage string, args ...interface{}) bool {
+	customMsg := ""
+	if len(customMsgs) > 0 {
+		customMsg = strings.Join(customMsgs, " ")
+	}
+	if customMsg != "" {
+		failureMessage += " - " + customMsg
+	}
+	t.Errorf(failureMessage, args...)
+	return false
+}
+
+func autofail(t TestingT, success bool, customMsgs []string, failureMessage string, args ...interface{}) bool {
+	if success {
+		return true
+	}
+	return fail(t, customMsgs, failureMessage, args...)
+}
+
+func checkDidPanic(f func()) (didPanic bool, message string) {
+	didPanic = true
+	defer func() {
+		r := recover()
+
+		if r == nil {
+			message = "nil"
+			return
+		}
+
+		err, ok := r.(error)
+		if ok {
+			message = err.Error()
+			return
+		}
+
+		errStr, ok := r.(string)
+		if ok {
+			message = errStr
+			return
+		}
+
+		message = "recover: unsupported type"
+	}()
+	f()
+	didPanic = false
+	return
+}

examples/gno.land/p/demo/uassert/mock_test.gno

@@ -0,0 +1,59 @@
+package uassert
+
+import (
+	"fmt"
+	"testing"
+)
+
+type mockTestingT struct {
+	fmt  string
+	args []interface{}
+}
+
+// --- interface mock
+
+var _ TestingT = (*mockTestingT)(nil)
+
+func (mockT *mockTestingT) Helper()                              { /* noop */ }
+func (mockT *mockTestingT) Skip(args ...interface{})             { /* not implmented */ }
+func (mockT *mockTestingT) Fail()                                { /* not implmented */ }
+func (mockT *mockTestingT) FailNow()                             { /* not implmented */ }
+func (mockT *mockTestingT) Logf(fmt string, args ...interface{}) { /* noop */ }
+
+func (mockT *mockTestingT) Fatalf(fmt string, args ...interface{}) {
+	mockT.fmt = "fatal: " + fmt
+	mockT.args = args
+}
+
+func (mockT *mockTestingT) Errorf(fmt string, args ...interface{}) {
+	mockT.fmt = "error: " + fmt
+	mockT.args = args
+}
+
+// --- helpers
+
+func (mockT *mockTestingT) actualString() string {
+	res := fmt.Sprintf(mockT.fmt, mockT.args...)
+	mockT.reset()
+	return res
+}
+
+func (mockT *mockTestingT) reset() {
+	mockT.fmt = ""
+	mockT.args = nil
+}
+
+func (mockT *mockTestingT) equals(t *testing.T, expected string) {
+	actual := mockT.actualString()
+
+	if expected != actual {
+		t.Errorf("mockT differs:\n- expected: %s\n- actual:   %s\n", expected, actual)
+	}
+}
+
+func (mockT *mockTestingT) empty(t *testing.T) {
+	if mockT.fmt != "" || mockT.args != nil {
+		actual := mockT.actualString()
+		t.Errorf("mockT should be empty, got %s", actual)
+	}
+}

examples/gno.land/p/demo/uassert/types.gno

@@ -0,0 +1,11 @@
+package uassert
+
+type TestingT interface {
+	Helper()
+	Skip(args ...interface{})
+	Fatalf(fmt string, args ...interface{})
+	Errorf(fmt string, args ...interface{})
+	Logf(fmt string, args ...interface{})
+	Fail()
+	FailNow()
+}