table testing with go routines only really works well when standard

assertions are ued. With suite.Required() there are issues in getting
the test results correct.

Instead, use standard assertions and use suite.T().Failed() to do
early returns.

Makefile

@@ -13,7 +13,7 @@ generate:
 vet: fmt
 	go vet ./...
 
-test: 
+test: build
 	go test -count=1 -v ./...
 
 build: generate vet

pkg/support/iowrappers/channelreadwritecloser.go

@@ -2,6 +2,7 @@ package iowrappers
 
 import (
 	"context"
+	"errors"
 	"io"
 	"log"
 )
@@ -28,17 +29,16 @@ func NewChannelReadWriter(ctx context.Context, receiver <-chan []byte,
 func (rw *ChannelReadWriter) Read(p []byte) (n int, err error) {
 	nread := copy(p, rw.readBuf)
 	if nread > 0 {
+		log.Printf("Read %v bytes", nread)
 		rw.readBuf = rw.readBuf[nread:]
 		return nread, nil
 	}
 
 	select {
 	case <-rw.ctx.Done():
-		log.Println("Context was canceled")
 		return 0, io.EOF
 	case data, ok := <-rw.receiver:
 		if !ok {
-			log.Println("Channel closed")
 			return 0, io.EOF
 		}
 		nread = copy(p, data)
@@ -48,13 +48,18 @@ func (rw *ChannelReadWriter) Read(p []byte) (n int, err error) {
 
 }
 func (rw *ChannelReadWriter) Write(p []byte) (n int, err error) {
+	if rw.closed {
+		return 0, errors.New("Write on closed channel")
+	}
 	select {
 	case <-rw.ctx.Done():
+		rw.Close()
 		return 0, io.EOF
 	case rw.sender <- p:
 	}
 	return len(p), nil
 }
+
 func (rw *ChannelReadWriter) Close() error {
 	if !rw.closed {
 		close(rw.sender)

pkg/support/iowrappers/channelreadwriter_test.go

@@ -35,7 +35,6 @@ func (suite *ChannelReadWriterTestSuite) createChannel() {
 		timeoutCancelFunc()
 		cancelFunc()
 	}
-	suite.cancelFunc = cancelFunc
 	suite.conn = NewChannelReadWriter(ctx, toChannel, fromChannel)
 }
 
@@ -49,47 +48,77 @@ func (suite *ChannelReadWriterTestSuite) TearDownTest() {
 
 type TestFunc func() any
 
-func runAndWait(functions ...TestFunc) []any {
+func (suite *ChannelReadWriterTestSuite) runAndWait(functions ...TestFunc) []any {
 	wg := sync.WaitGroup{}
 	wg.Add(len(functions))
 	res := make([]any, len(functions))
 	for i, function := range functions {
 		go func() {
+			defer func() {
+				wg.Done()
+			}()
 			res[i] = function()
-			wg.Done()
 		}()
 	}
 	wg.Wait()
 	return res
 }
 
-func (suite *ChannelReadWriterTestSuite) Test_SlicesLargeEnough() {
-	requires := suite.Require()
-	data := []byte("hello")
-
-	runAndWait(
-		func() any {
-			suite.toChannel <- data
-			log.Println("data sent")
-			return nil
+func (suite *ChannelReadWriterTestSuite) Test_SuccessfulCommunication() {
+	tests := []struct {
+		name       string
+		data       string
+		chunkSizes []int
+		chunks     []string
+	}{
+		{
+			name:       "buffer_large_enough",
+			data:       "hello",
+			chunkSizes: []int{10},
+			chunks:     []string{"hello"},
 		},
-		func() any {
-			buf := make([]byte, len(data)*2)
-			n, err := suite.conn.Read(buf)
-			requires.Nil(err)
-			requires.Equal(n, len(data))
-			requires.Equal(data, buf[:n])
-			return nil
+		{
+			name:       "two_reads_required",
+			data:       "hello",
+			chunkSizes: []int{3, 10},
+			chunks:     []string{"hel", "lo"},
 		},
-	)
-}
+		{
+			name:       "many_reads_required",
+			data:       "hello",
+			chunkSizes: []int{1, 1, 1, 1, 1},
+			chunks:     []string{"h", "e", "l", "l", "o"},
+		},
+	}
 
-func (suite *ChannelReadWriterTestSuite) Test_SliceTooSmallFullReadInTwoParts() {
-	suite.FailNow("todo")
-}
+	for _, test := range tests {
+		suite.Run(test.name, func() {
+			suite.runAndWait(
+				func() any {
+					select {
+					case <-suite.ctx.Done():
+						suite.FailNow("deadline reached")
+						log.Println("Write deadline exceeded")
+					case suite.toChannel <- []byte(test.data):
+					}
+					return nil
+				},
+				func() any {
+					remainder := test.data
+					for i, chunkSize := range test.chunkSizes {
+						buf := make([]byte, chunkSize)
+						n, err := suite.conn.Read(buf)
+						suite.Nil(err)
+						suite.Equal(n, len(test.chunks[i]))
+						suite.Equal([]byte(remainder[:n]), buf[:n])
+						remainder = remainder[n:]
+					}
+					return nil
+				},
+			)
+		})
+	}
 
-func (suite *ChannelReadWriterTestSuite) Test_SliceTooSmallFullREadInManyParts() {
-	suite.FailNow("todo")
 }
 
 func (suite *ChannelReadWriterTestSuite) Test_Close() {