neotest: POC of test coverage

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>

pkg/neotest/basic.go

@@ -335,7 +335,7 @@ func (e *Executor) AddNewBlock(t testing.TB, txs ...*transaction.Transaction) *b
 	return b
 }
 
-// GenerateNewBlocks adds the specified number of empty blocks to the chain.
+// GenerateNewBlocks adds the specified number of empty Blocks to the chain.
 func (e *Executor) GenerateNewBlocks(t testing.TB, count int) []*block.Block {
 	blocks := make([]*block.Block, count)
 	for i := 0; i < count; i++ {

pkg/neotest/client.go

@@ -1,6 +1,7 @@
 package neotest
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
@@ -48,8 +49,12 @@ func (e *Executor) ValidatorInvoker(h util.Uint160) *ContractInvoker {
 
 // TestInvoke creates test the VM and invokes the method with the args.
 func (c *ContractInvoker) TestInvoke(t testing.TB, method string, args ...interface{}) (*vm.Stack, error) {
+	fmt.Println("TEST INVOKE")
 	tx := c.PrepareInvokeNoSign(t, method, args...)
 	b := c.NewUnsignedBlock(t, tx)
+
+	calculateCoverage(t, c.Chain, tx, b)
+
 	ic := c.Chain.GetTestVM(trigger.Application, tx, b)
 	t.Cleanup(ic.Finalize)
 

pkg/neotest/compile.go

@@ -2,6 +2,7 @@ package neotest
 
 import (
 	"io"
+	"path/filepath"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/cli/smartcontract"
@@ -19,6 +20,7 @@ type Contract struct {
 	Hash      util.Uint160
 	NEF       *nef.File
 	Manifest  *manifest.Manifest
+	DebugInfo *compiler.DebugInfo
 }
 
 // contracts caches the compiled contracts from FS across multiple tests.
@@ -44,6 +46,11 @@ func CompileSource(t testing.TB, sender util.Uint160, src io.Reader, opts *compi
 
 // CompileFile compiles a contract from the file and returns its NEF, manifest and hash.
 func CompileFile(t testing.TB, sender util.Uint160, srcPath string, configPath string) *Contract {
+	absPath, err := filepath.Abs(srcPath)
+	if err == nil {
+		srcPath = absPath
+	}
+
 	if c, ok := contracts[srcPath]; ok {
 		return c
 	}
@@ -75,6 +82,7 @@ func CompileFile(t testing.TB, sender util.Uint160, srcPath string, configPath s
 		Hash:      state.CreateContractHash(sender, ne.Checksum, m.Name),
 		NEF:       ne,
 		Manifest:  m,
+		DebugInfo: di,
 	}
 	contracts[srcPath] = c
 	return c

pkg/neotest/coverage.go

@@ -0,0 +1,95 @@
+package neotest
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+var (
+	Blocks   map[string][]testing.CoverBlock
+	Counters map[string][]uint32
+)
+
+func init() {
+	var cover testing.Cover
+	cover.Mode = testing.CoverMode()
+	Blocks = make(map[string][]testing.CoverBlock)
+	Counters = make(map[string][]uint32)
+	cover.Blocks = Blocks
+	cover.Counters = Counters
+	testing.RegisterCover(cover)
+}
+
+func calculateCoverage(t testing.TB, bc blockchainer.Blockchainer, tx *transaction.Transaction, b *block.Block) {
+	fmt.Println("CALCULATE COVERAGE")
+	ic := bc.GetTestVM(trigger.Application, tx, b)
+	t.Cleanup(ic.Finalize)
+
+	ic.VM.LoadWithFlags(tx.Script, callflag.All)
+
+	hm := make(map[util.Uint160][]int)
+
+runLoop:
+	for {
+		switch {
+		case ic.VM.HasStopped():
+			break runLoop
+		default:
+			h := ic.VM.GetCurrentScriptHash()
+			if err := ic.VM.Step(); err != nil {
+				break runLoop
+			}
+			if ic.VM.Context() != nil {
+				hm[h] = append(hm[h], ic.VM.Context().IP())
+			}
+		}
+	}
+
+	// Calculate coverage.
+coverageLoop:
+	for h := range hm {
+		fmt.Println("TRY HASH", h)
+		for name, c := range contracts {
+			fmt.Println("TRY CONTRACT", name, c.Hash)
+			if !c.Hash.Equals(h) {
+				continue
+			}
+			if c.DebugInfo == nil {
+				continue coverageLoop
+			}
+
+			var coverBlocks []testing.CoverBlock
+			var coverCounts []uint32
+
+		ipLoop:
+			for _, ip := range hm[h] {
+				for _, m := range c.DebugInfo.Methods {
+					for _, sp := range m.SeqPoints {
+						if sp.Opcode == ip {
+							fmt.Println("FOUND COVER BLOCK")
+							coverCounts = append(coverCounts, 1)
+							coverBlocks = append(coverBlocks, testing.CoverBlock{
+								Line0: uint32(sp.StartLine),
+								Col0:  uint16(sp.StartCol),
+								Line1: uint32(sp.EndLine),
+								Col1:  uint16(sp.EndCol),
+								Stmts: 1,
+							})
+							continue ipLoop
+						}
+					}
+				}
+			}
+			Blocks[name] = coverBlocks
+			Counters[name] = coverCounts
+			continue coverageLoop
+		}
+	}
+}