diff --git a/test/emulator_backend.go b/test/emulator_backend.go
index 18db2042..8ddb4ec1 100644
--- a/test/emulator_backend.go
+++ b/test/emulator_backend.go
@@ -69,6 +69,10 @@ type EmulatorBackend struct {
 	configuration *stdlib.Configuration
 
 	stdlibHandler stdlib.StandardLibraryHandler
+
+	// logCollection is a hook attached in the server logger, in order
+	// to aggregate and expose log messages from the blockchain.
+	logCollection *LogCollectionHook
 }
 
 type keyInfo struct {
@@ -112,14 +116,16 @@ func NewEmulatorBackend(
 	stdlibHandler stdlib.StandardLibraryHandler,
 	coverageReport *runtime.CoverageReport,
 ) *EmulatorBackend {
+	logCollectionHook := NewLogCollectionHook()
 	var blockchain *emulator.Blockchain
 	if coverageReport != nil {
 		excludeCommonLocations(coverageReport)
 		blockchain = newBlockchain(
+			logCollectionHook,
 			emulator.WithCoverageReport(coverageReport),
 		)
 	} else {
-		blockchain = newBlockchain()
+		blockchain = newBlockchain(logCollectionHook)
 	}
 
 	return &EmulatorBackend{
@@ -129,6 +135,7 @@ func NewEmulatorBackend(
 		fileResolver:  fileResolver,
 		configuration: baseConfiguration(),
 		stdlibHandler: stdlibHandler,
+		logCollection: logCollectionHook,
 	}
 }
 
@@ -430,17 +437,24 @@ func (e *EmulatorBackend) ReadFile(path string) (string, error) {
 	return e.fileResolver(path)
 }
 
+// Logs returns all the log messages from the blockchain.
+func (e *EmulatorBackend) Logs() []string {
+	return e.logCollection.Logs
+}
+
 // newBlockchain returns an emulator blockchain for testing.
-func newBlockchain(opts ...emulator.Option) *emulator.Blockchain {
+func newBlockchain(
+	hook *LogCollectionHook,
+	opts ...emulator.Option,
+) *emulator.Blockchain {
+	output := zerolog.ConsoleWriter{Out: os.Stdout}
+	logger := zerolog.New(output).With().Timestamp().Logger().Hook(hook)
+
 	b, err := emulator.New(
 		append(
 			[]emulator.Option{
 				emulator.WithStorageLimitEnabled(false),
-				emulator.WithServerLogger(
-					zerolog.New(
-						zerolog.ConsoleWriter{Out: os.Stdout},
-					).With().Timestamp().Logger(),
-				),
+				emulator.WithServerLogger(logger),
 				emulator.Contracts(emulator.CommonContracts),
 			},
 			opts...,
@@ -520,11 +534,6 @@ func (e *EmulatorBackend) Reset() {
 	e.blockOffset = 0
 }
 
-func (e *EmulatorBackend) Logs() []string {
-	// TODO
-	return nil
-}
-
 func (e *EmulatorBackend) ServiceAccount() (*stdlib.Account, error) {
 	// TODO
 	return nil, errors.New("TODO")
diff --git a/test/go.mod b/test/go.mod
index f3e1bc12..b14fe6c6 100644
--- a/test/go.mod
+++ b/test/go.mod
@@ -3,6 +3,7 @@ module github.com/onflow/cadence-tools/test
 go 1.18
 
 require (
+	github.com/logrusorgru/aurora v2.0.3+incompatible
 	github.com/onflow/cadence v0.39.1
 	github.com/onflow/flow-emulator v0.50.1
 	github.com/onflow/flow-go v0.30.1-0.20230602200347-2a0e824db380
@@ -69,7 +70,6 @@ require (
 	github.com/libp2p/go-buffer-pool v0.1.0 // indirect
 	github.com/libp2p/go-libp2p v0.24.2 // indirect
 	github.com/libp2p/go-openssl v0.1.0 // indirect
-	github.com/logrusorgru/aurora v2.0.3+incompatible // indirect
 	github.com/logrusorgru/aurora/v4 v4.0.0 // indirect
 	github.com/m4ksio/wal v1.0.1-0.20221209164835-154a17396e4c // indirect
 	github.com/magiconair/properties v1.8.6 // indirect
diff --git a/test/test_framework_test.go b/test/test_framework_test.go
index 9ffdb0b6..88ff20bd 100644
--- a/test/test_framework_test.go
+++ b/test/test_framework_test.go
@@ -37,7 +37,7 @@ import (
 func TestRunningMultipleTests(t *testing.T) {
 	t.Parallel()
 
-	code := `
+	const code = `
         pub fun testFunc1() {
             assert(false)
         }
@@ -65,7 +65,7 @@ func TestRunningMultipleTests(t *testing.T) {
 func TestRunningSingleTest(t *testing.T) {
 	t.Parallel()
 
-	code := `
+	const code = `
         pub fun testFunc1() {
             assert(false)
         }
@@ -89,7 +89,7 @@ func TestRunningSingleTest(t *testing.T) {
 func TestAssertFunction(t *testing.T) {
 	t.Parallel()
 
-	code := `
+	const code = `
         import Test
 
         pub fun testAssertWithNoArgs() {
@@ -136,7 +136,7 @@ func TestExecuteScript(t *testing.T) {
 	t.Run("no args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -157,7 +157,7 @@ func TestExecuteScript(t *testing.T) {
 	t.Run("with args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -180,7 +180,7 @@ func TestExecuteScript(t *testing.T) {
 	t.Run("array returns", func(t *testing.T) {
 		t.Parallel()
 
-		code := ` pub fun main(): [UInt64] { return [1, 2, 3]} `
+		const code = ` pub fun main(): [UInt64] { return [1, 2, 3]} `
 
 		testScript := fmt.Sprintf(
 			`
@@ -210,7 +210,7 @@ func TestExecuteScript(t *testing.T) {
 	t.Run("dictionary returns", func(t *testing.T) {
 		t.Parallel()
 
-		code := ` pub fun main(): {String: Int} { return {\"foo\": 5, \"bar\": 10}} `
+		const code = ` pub fun main(): {String: Int} { return {\"foo\": 5, \"bar\": 10}} `
 
 		testScript := fmt.Sprintf(
 			`
@@ -242,7 +242,7 @@ func TestImportContract(t *testing.T) {
 	t.Run("init no params", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {
@@ -252,7 +252,7 @@ func TestImportContract(t *testing.T) {
             }
         `
 
-		fooContract := `
+		const fooContract = `
             pub contract FooContract {
                 init() {}
 
@@ -276,7 +276,7 @@ func TestImportContract(t *testing.T) {
 	t.Run("init with params", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {
@@ -286,7 +286,7 @@ func TestImportContract(t *testing.T) {
             }
         `
 
-		fooContract := `
+		const fooContract = `
             pub contract FooContract {
 
                 pub var greeting: String
@@ -315,7 +315,7 @@ func TestImportContract(t *testing.T) {
 	t.Run("invalid import", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {
@@ -344,7 +344,7 @@ func TestImportContract(t *testing.T) {
 	t.Run("import resolver not provided", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {
@@ -373,20 +373,20 @@ func TestImportContract(t *testing.T) {
 			Name:    "BarContract",
 		}
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {}
         `
 
-		fooContract := `
+		const fooContract = `
            import BarContract from 0x01
 
             pub contract FooContract {
                 init() {}
             }
         `
-		barContract := `
+		const barContract = `
             pub contract BarContract {
                 init() {}
             }
@@ -528,7 +528,7 @@ func TestUsingEnv(t *testing.T) {
 	t.Run("public key creation", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub fun test() {
                 var publicKey = PublicKey(
                     publicKey: "1234".decodeHex(),
@@ -550,7 +550,7 @@ func TestUsingEnv(t *testing.T) {
 	t.Run("public account", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub fun test() {
                 var acc = getAccount(0x01)
                 var bal = acc.balance
@@ -568,7 +568,7 @@ func TestUsingEnv(t *testing.T) {
 	t.Run("account access in imported program", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import FooContract from "./FooContract"
 
             pub fun test() {
@@ -578,7 +578,7 @@ func TestUsingEnv(t *testing.T) {
             }
         `
 
-		fooContract := `
+		const fooContract = `
             pub contract FooContract {
                 init() {}
 
@@ -603,7 +603,7 @@ func TestUsingEnv(t *testing.T) {
 	t.Run("verify using public key of account", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -629,7 +629,7 @@ func TestUsingEnv(t *testing.T) {
 	t.Run("verify using public key returned from blockchain", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -684,7 +684,7 @@ func TestUsingEnv(t *testing.T) {
 func TestCreateAccount(t *testing.T) {
 	t.Parallel()
 
-	code := `
+	const code = `
         import Test
 
         pub fun test() {
@@ -705,7 +705,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("add transaction", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -732,7 +732,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run next transaction", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -762,7 +762,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run next transaction with authorizer", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -792,7 +792,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("transaction failure", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -822,7 +822,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run non existing transaction", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -841,7 +841,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("commit block", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -859,7 +859,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("commit un-executed block", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -890,7 +890,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("commit partially executed block", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -927,7 +927,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("multiple commit block", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -946,7 +946,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run given transaction", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -974,7 +974,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run transaction with args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1002,7 +1002,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run transaction with multiple authorizers", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1031,7 +1031,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run given transaction unsuccessful", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1059,7 +1059,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run multiple transactions", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1114,7 +1114,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run empty transactions", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1135,7 +1135,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("run transaction with pending transactions", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1174,7 +1174,7 @@ func TestExecutingTransactions(t *testing.T) {
 	t.Run("transaction with array typed args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1206,7 +1206,7 @@ func TestSetupAndTearDown(t *testing.T) {
 	t.Run("setup", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub(set) var setupRan = false
 
             pub fun setup() {
@@ -1232,7 +1232,7 @@ func TestSetupAndTearDown(t *testing.T) {
 	t.Run("setup failed", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub fun setup() {
                 panic("error occurred")
             }
@@ -1251,7 +1251,7 @@ func TestSetupAndTearDown(t *testing.T) {
 	t.Run("teardown", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub(set) var tearDownRan = false
 
             pub fun testFunc() {
@@ -1276,7 +1276,7 @@ func TestSetupAndTearDown(t *testing.T) {
 	t.Run("teardown failed", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             pub(set) var tearDownRan = false
 
             pub fun testFunc() {
@@ -1414,7 +1414,7 @@ func TestBeforeAndAfterEach(t *testing.T) {
 func TestPrettyPrintTestResults(t *testing.T) {
 	t.Parallel()
 
-	code := `
+	const code = `
         import Test
 
         pub fun testFunc1() {
@@ -1440,7 +1440,7 @@ func TestPrettyPrintTestResults(t *testing.T) {
 
 	resultsStr := PrettyPrintResults(results, "test_script.cdc")
 
-	expected := `Test results: "test_script.cdc"
+	const expected = `Test results: "test_script.cdc"
 - PASS: testFunc1
 - FAIL: testFunc2
 		Execution failed:
@@ -1464,7 +1464,7 @@ func TestLoadingProgramsFromLocalFile(t *testing.T) {
 	t.Run("read script", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1506,7 +1506,7 @@ func TestLoadingProgramsFromLocalFile(t *testing.T) {
 	t.Run("read invalid", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1543,7 +1543,7 @@ func TestLoadingProgramsFromLocalFile(t *testing.T) {
 	t.Run("no resolver set", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1569,7 +1569,7 @@ func TestDeployingContracts(t *testing.T) {
 	t.Run("no args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1612,7 +1612,7 @@ func TestDeployingContracts(t *testing.T) {
 	t.Run("with args", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1659,7 +1659,7 @@ func TestErrors(t *testing.T) {
 	t.Run("contract deployment error", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1691,7 +1691,7 @@ func TestErrors(t *testing.T) {
 	t.Run("script error", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1721,7 +1721,7 @@ func TestErrors(t *testing.T) {
 	t.Run("transaction error", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub fun test() {
@@ -1755,7 +1755,7 @@ func TestInterpretFailFunction(t *testing.T) {
 	t.Parallel()
 
 	t.Run("without message", func(t *testing.T) {
-		script := `
+		const script = `
         import Test
 
         pub fun test() {
@@ -1771,7 +1771,7 @@ func TestInterpretFailFunction(t *testing.T) {
 	})
 
 	t.Run("with message", func(t *testing.T) {
-		script := `
+		const script = `
         import Test
 
         pub fun test() {
@@ -1795,7 +1795,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom matcher", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1821,7 +1821,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom matcher primitive type", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1843,7 +1843,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom matcher invalid type usage", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1867,7 +1867,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom resource matcher", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1901,7 +1901,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom resource matcher invalid type", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1925,7 +1925,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom matcher with explicit type", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1947,7 +1947,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("custom matcher with mismatching types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -1969,7 +1969,7 @@ func TestInterpretMatcher(t *testing.T) {
 	t.Run("combined matcher mismatching types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2004,7 +2004,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("equal matcher with primitive", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2022,7 +2022,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("equal matcher with struct", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2043,7 +2043,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("equal matcher with resource", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2067,7 +2067,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("with explicit types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2084,7 +2084,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("with incorrect types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2104,7 +2104,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("matcher or", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2127,7 +2127,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("matcher or fail", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2150,7 +2150,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("matcher and", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2173,7 +2173,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("chained matchers", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2196,7 +2196,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("resource matcher or", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2230,7 +2230,7 @@ func TestInterpretEqualMatcher(t *testing.T) {
 	t.Run("resource matcher and", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2267,7 +2267,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("success", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2284,7 +2284,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("fail", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2302,7 +2302,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("different types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2320,7 +2320,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("with explicit types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2337,7 +2337,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("mismatching types", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2356,7 +2356,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("resource with resource matcher", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2380,7 +2380,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("resource with struct matcher", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2404,7 +2404,7 @@ func TestInterpretExpectFunction(t *testing.T) {
 	t.Run("struct with resource matcher", func(t *testing.T) {
 		t.Parallel()
 
-		script := `
+		const script = `
             import Test
 
             pub fun test() {
@@ -2432,7 +2432,7 @@ func TestReplacingImports(t *testing.T) {
 	t.Run("file location", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub var blockchain = Test.newEmulatorBlockchain()
@@ -2510,7 +2510,7 @@ func TestReplacingImports(t *testing.T) {
 	t.Run("address location", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub var blockchain = Test.newEmulatorBlockchain()
@@ -2592,7 +2592,7 @@ func TestReplacingImports(t *testing.T) {
 	t.Run("config not provided", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub var blockchain = Test.newEmulatorBlockchain()
@@ -2670,7 +2670,7 @@ func TestReplacingImports(t *testing.T) {
 	t.Run("config with missing imports", func(t *testing.T) {
 		t.Parallel()
 
-		code := `
+		const code = `
             import Test
 
             pub var blockchain = Test.newEmulatorBlockchain()
@@ -2737,14 +2737,14 @@ func TestReplaceImports(t *testing.T) {
 		},
 	})
 
-	code := `
+	const code = `
         import C1 from "./sample/contract1.cdc"
         import C2 from "./sample/contract2.cdc"
         import C3 from "./sample/contract3.cdc"
 
         pub fun main() {}
     `
-	expected := `
+	const expected = `
         import C1 from 0x0100000000000000
         import C2 from 0x0200000000000000
         import C3 from 0x0300000000000000
@@ -2798,7 +2798,7 @@ func TestCoverageReportForUnitTests(t *testing.T) {
 	    }
 	`
 
-	code := `
+	const code = `
 	    import FooContract from "FooContract.cdc"
 
 	    pub let foo = FooContract()
@@ -2962,7 +2962,7 @@ func TestCoverageReportForIntegrationTests(t *testing.T) {
 	    }
 	`
 
-	testCode := `
+	const testCode = `
 	    import Test
 
 	    pub let blockchain = Test.newEmulatorBlockchain()
@@ -3010,7 +3010,7 @@ func TestCoverageReportForIntegrationTests(t *testing.T) {
 	    }
 	`
 
-	transactionCode := `
+	const transactionCode = `
 	    import FooContract from "../contracts/FooContract.cdc"
 
 	    transaction(number: Int, trait: String) {
@@ -3111,3 +3111,426 @@ func TestCoverageReportForIntegrationTests(t *testing.T) {
 		coverageReport.String(),
 	)
 }
+
+func TestRetrieveLogsFromUnitTests(t *testing.T) {
+	t.Parallel()
+
+	const fooContract = `
+	    pub contract FooContract {
+	        pub let specialNumbers: {Int: String}
+
+	        init() {
+	            self.specialNumbers = {1729: "Harshad"}
+	            log("init successful")
+	        }
+
+	        pub fun addSpecialNumber(_ n: Int, _ trait: String) {
+	            self.specialNumbers[n] = trait
+	            log("specialNumbers updated")
+	        }
+
+	        pub fun getIntegerTrait(_ n: Int): String {
+	            if self.specialNumbers.containsKey(n) {
+	                return self.specialNumbers[n]!
+	            }
+
+	            return "Unknown"
+	        }
+	    }
+	`
+
+	const code = `
+	    import FooContract from "FooContract.cdc"
+
+	    pub let foo = FooContract()
+
+	    pub fun setup() {
+	        log("setup successful")
+	    }
+
+	    pub fun testGetIntegerTrait() {
+	        // Act
+	        let result = foo.getIntegerTrait(1729)
+
+	        // Assert
+	        assert(result == "Harshad")
+	        log("getIntegerTrait works")
+	    }
+
+	    pub fun testAddSpecialNumber() {
+	        // Act
+	        foo.addSpecialNumber(78557, "Sierpinski")
+
+	        // Assert
+	        assert("Sierpinski" == foo.getIntegerTrait(78557))
+	        log("addSpecialNumber works")
+	    }
+	`
+
+	importResolver := func(location common.Location) (string, error) {
+		if location == common.StringLocation("FooContract.cdc") {
+			return fooContract, nil
+		}
+
+		return "", fmt.Errorf("unsupported import %s", location)
+	}
+
+	runner := NewTestRunner().WithImportResolver(importResolver)
+
+	results, err := runner.RunTests(code)
+	require.NoError(t, err)
+	for _, result := range results {
+		require.NoError(t, result.Error)
+	}
+
+	logs := runner.Logs()
+	assert.ElementsMatch(
+		t,
+		[]string{
+			"init successful",
+			"setup successful",
+			"getIntegerTrait works",
+			"specialNumbers updated",
+			"addSpecialNumber works",
+		},
+		logs,
+	)
+}
+
+func TestRetrieveEmptyLogsFromUnitTests(t *testing.T) {
+	t.Parallel()
+
+	const fooContract = `
+	    pub contract FooContract {
+	        pub let specialNumbers: {Int: String}
+
+	        init() {
+	            self.specialNumbers = {1729: "Harshad"}
+	        }
+
+	        pub fun addSpecialNumber(_ n: Int, _ trait: String) {
+	            self.specialNumbers[n] = trait
+	        }
+
+	        pub fun getIntegerTrait(_ n: Int): String {
+	            if self.specialNumbers.containsKey(n) {
+	                return self.specialNumbers[n]!
+	            }
+
+	            return "Unknown"
+	        }
+	    }
+	`
+
+	const code = `
+	    import FooContract from "FooContract.cdc"
+
+	    pub let foo = FooContract()
+
+	    pub fun testGetIntegerTrait() {
+	        // Act
+	        let result = foo.getIntegerTrait(1729)
+
+	        // Assert
+	        assert(result == "Harshad")
+	    }
+
+	    pub fun testAddSpecialNumber() {
+	        // Act
+	        foo.addSpecialNumber(78557, "Sierpinski")
+
+	        // Assert
+	        assert("Sierpinski" == foo.getIntegerTrait(78557))
+	    }
+	`
+
+	importResolver := func(location common.Location) (string, error) {
+		if location == common.StringLocation("FooContract.cdc") {
+			return fooContract, nil
+		}
+
+		return "", fmt.Errorf("unsupported import %s", location)
+	}
+
+	runner := NewTestRunner().WithImportResolver(importResolver)
+
+	results, err := runner.RunTests(code)
+	require.NoError(t, err)
+	for _, result := range results {
+		require.NoError(t, result.Error)
+	}
+
+	logs := runner.Logs()
+	assert.Equal(t, []string{}, logs)
+}
+
+func TestRetrieveLogsFromIntegrationTests(t *testing.T) {
+	t.Parallel()
+
+	const contractCode = `
+	    pub contract FooContract {
+	        pub let specialNumbers: {Int: String}
+
+	        init() {
+	            self.specialNumbers = {1729: "Harshad"}
+	            log("init successful")
+	        }
+
+	        pub fun addSpecialNumber(_ n: Int, _ trait: String) {
+	            self.specialNumbers[n] = trait
+	            log("specialNumbers updated")
+	        }
+
+	        pub fun getIntegerTrait(_ n: Int): String {
+	            if self.specialNumbers.containsKey(n) {
+	                return self.specialNumbers[n]!
+	            }
+
+	            return "Unknown"
+	        }
+	    }
+	`
+
+	const scriptCode = `
+	    import FooContract from "../contracts/FooContract.cdc"
+
+	    pub fun main(): Bool {
+	        // Act
+	        let trait = FooContract.getIntegerTrait(1729)
+
+	        // Assert
+	        assert(trait == "Harshad")
+
+	        log("getIntegerTrait works")
+	        return true
+	    }
+	`
+
+	const testCode = `
+	    import Test
+
+	    pub let blockchain = Test.newEmulatorBlockchain()
+	    pub let account = blockchain.createAccount()
+
+	    pub fun setup() {
+	        let contractCode = Test.readFile("../contracts/FooContract.cdc")
+	        let err = blockchain.deployContract(
+	            name: "FooContract",
+	            code: contractCode,
+	            account: account,
+	            arguments: []
+	        )
+
+	        if err != nil {
+	            panic(err!.message)
+	        }
+
+	        blockchain.useConfiguration(Test.Configuration({
+	            "../contracts/FooContract.cdc": account.address
+	        }))
+	    }
+
+	    pub fun testGetIntegerTrait() {
+	        let script = Test.readFile("../scripts/get_integer_traits.cdc")
+	        let result = blockchain.executeScript(script, [])
+
+	        if result.status != Test.ResultStatus.succeeded {
+	            panic(result.error!.message)
+	        }
+	        assert(result.returnValue! as! Bool)
+	    }
+
+	    pub fun testAddSpecialNumber() {
+	        let code = Test.readFile("../transactions/add_special_number.cdc")
+	        let tx = Test.Transaction(
+	            code: code,
+	            authorizers: [account.address],
+	            signers: [account],
+	            arguments: [78557, "Sierpinski"]
+	        )
+
+	        let result = blockchain.executeTransaction(tx)
+	        assert(result.status == Test.ResultStatus.succeeded)
+	    }
+
+	    pub fun tearDown() {
+	        let expectedLogs = [
+	            "init successful",
+	            "getIntegerTrait works",
+	            "specialNumbers updated",
+	            "addSpecialNumber works"
+	        ]
+
+	        for logMsg in blockchain.logs() {
+	            Test.assert(expectedLogs.contains(logMsg))
+	        }
+	    }
+	`
+
+	const transactionCode = `
+	    import FooContract from "../contracts/FooContract.cdc"
+
+	    transaction(number: Int, trait: String) {
+	        prepare(acct: AuthAccount) {}
+
+	        execute {
+	            // Act
+	            FooContract.addSpecialNumber(number, trait)
+
+	            // Assert
+	            assert(trait == FooContract.getIntegerTrait(number))
+	            log("addSpecialNumber works")
+	        }
+	    }
+	`
+
+	fileResolver := func(path string) (string, error) {
+		switch path {
+		case "../contracts/FooContract.cdc":
+			return contractCode, nil
+		case "../scripts/get_integer_traits.cdc":
+			return scriptCode, nil
+		case "../transactions/add_special_number.cdc":
+			return transactionCode, nil
+		default:
+			return "", fmt.Errorf("cannot find import location: %s", path)
+		}
+	}
+
+	runner := NewTestRunner().WithFileResolver(fileResolver)
+
+	results, err := runner.RunTests(testCode)
+	require.NoError(t, err)
+	for _, result := range results {
+		require.NoError(t, result.Error)
+	}
+}
+
+func TestRetrieveEmptyLogsFromIntegrationTests(t *testing.T) {
+	t.Parallel()
+
+	const contractCode = `
+	    pub contract FooContract {
+	        pub let specialNumbers: {Int: String}
+
+	        init() {
+	            self.specialNumbers = {1729: "Harshad"}
+	        }
+
+	        pub fun addSpecialNumber(_ n: Int, _ trait: String) {
+	            self.specialNumbers[n] = trait
+	        }
+
+	        pub fun getIntegerTrait(_ n: Int): String {
+	            if self.specialNumbers.containsKey(n) {
+	                return self.specialNumbers[n]!
+	            }
+
+	            return "Unknown"
+	        }
+	    }
+	`
+
+	const scriptCode = `
+	    import FooContract from "../contracts/FooContract.cdc"
+
+	    pub fun main(): Bool {
+	        // Act
+	        let trait = FooContract.getIntegerTrait(1729)
+
+	        // Assert
+	        assert(trait == "Harshad")
+
+	        return true
+	    }
+	`
+
+	const testCode = `
+	    import Test
+
+	    pub let blockchain = Test.newEmulatorBlockchain()
+	    pub let account = blockchain.createAccount()
+
+	    pub fun setup() {
+	        let contractCode = Test.readFile("../contracts/FooContract.cdc")
+	        let err = blockchain.deployContract(
+	            name: "FooContract",
+	            code: contractCode,
+	            account: account,
+	            arguments: []
+	        )
+
+	        if err != nil {
+	            panic(err!.message)
+	        }
+
+	        blockchain.useConfiguration(Test.Configuration({
+	            "../contracts/FooContract.cdc": account.address
+	        }))
+	    }
+
+	    pub fun testGetIntegerTrait() {
+	        let script = Test.readFile("../scripts/get_integer_traits.cdc")
+	        let result = blockchain.executeScript(script, [])
+
+	        if result.status != Test.ResultStatus.succeeded {
+	            panic(result.error!.message)
+	        }
+	        assert(result.returnValue! as! Bool)
+	    }
+
+	    pub fun testAddSpecialNumber() {
+	        let code = Test.readFile("../transactions/add_special_number.cdc")
+	        let tx = Test.Transaction(
+	            code: code,
+	            authorizers: [account.address],
+	            signers: [account],
+	            arguments: [78557, "Sierpinski"]
+	        )
+
+	        let result = blockchain.executeTransaction(tx)
+	        assert(result.status == Test.ResultStatus.succeeded)
+	    }
+
+	    pub fun tearDown() {
+	        Test.assert(blockchain.logs() == [])
+	    }
+	`
+
+	const transactionCode = `
+	    import FooContract from "../contracts/FooContract.cdc"
+
+	    transaction(number: Int, trait: String) {
+	        prepare(acct: AuthAccount) {}
+
+	        execute {
+	            // Act
+	            FooContract.addSpecialNumber(number, trait)
+
+	            // Assert
+	            assert(trait == FooContract.getIntegerTrait(number))
+	        }
+	    }
+	`
+
+	fileResolver := func(path string) (string, error) {
+		switch path {
+		case "../contracts/FooContract.cdc":
+			return contractCode, nil
+		case "../scripts/get_integer_traits.cdc":
+			return scriptCode, nil
+		case "../transactions/add_special_number.cdc":
+			return transactionCode, nil
+		default:
+			return "", fmt.Errorf("cannot find import location: %s", path)
+		}
+	}
+
+	runner := NewTestRunner().WithFileResolver(fileResolver)
+
+	results, err := runner.RunTests(testCode)
+	require.NoError(t, err)
+	for _, result := range results {
+		require.NoError(t, result.Error)
+	}
+}
diff --git a/test/test_runner.go b/test/test_runner.go
index f46140e0..eab14753 100644
--- a/test/test_runner.go
+++ b/test/test_runner.go
@@ -21,8 +21,10 @@ package test
 import (
 	"fmt"
 	"os"
+	"regexp"
 	"strings"
 
+	"github.com/logrusorgru/aurora"
 	"github.com/rs/zerolog"
 
 	"github.com/onflow/flow-go/engine/execution/testutil"
@@ -65,6 +67,36 @@ type Result struct {
 	Error    error
 }
 
+// LogCollectionHook can be attached to zerolog.Logger objects, in order
+// to aggregate the log messages in a string slice, containing only the
+// string message.
+type LogCollectionHook struct {
+	Logs []string
+}
+
+var _ zerolog.Hook = &LogCollectionHook{}
+
+// NewLogCollectionHook initializes and returns a *LogCollectionHook
+func NewLogCollectionHook() *LogCollectionHook {
+	return &LogCollectionHook{
+		Logs: make([]string, 0),
+	}
+}
+
+func (h *LogCollectionHook) Run(e *zerolog.Event, level zerolog.Level, msg string) {
+	if level != zerolog.NoLevel {
+		msg = strings.Replace(
+			msg,
+			"LOG:",
+			"",
+			1,
+		)
+		re := regexp.MustCompile("\"(.*)\"")
+		match := re.FindStringSubmatch(msg)
+		h.Logs = append(h.Logs, match[1])
+	}
+}
+
 // ImportResolver is used to resolve and get the source code for imports.
 // Must be provided by the user of the TestRunner.
 type ImportResolver func(location common.Location) (string, error)
@@ -90,11 +122,34 @@ type TestRunner struct {
 	testRuntime runtime.Runtime
 
 	coverageReport *runtime.CoverageReport
+
+	// logger is injected as the program logger for the script
+	// environment.
+	logger zerolog.Logger
+
+	// logCollection is a hook attached in the program logger of
+	// the script environment, in order to aggregate and expose
+	// log messages from test cases and contracts.
+	logCollection *LogCollectionHook
 }
 
 func NewTestRunner() *TestRunner {
+	logCollectionHook := NewLogCollectionHook()
+	output := zerolog.ConsoleWriter{Out: os.Stdout}
+	output.FormatMessage = func(i interface{}) string {
+		msg := i.(string)
+		return strings.Replace(
+			msg,
+			"Cadence log:",
+			aurora.Colorize("LOG:", aurora.BlueFg|aurora.BoldFm).String(),
+			1,
+		)
+	}
+	logger := zerolog.New(output).With().Timestamp().Logger().Hook(logCollectionHook)
 	return &TestRunner{
-		testRuntime: runtime.NewInterpreterRuntime(runtime.Config{}),
+		testRuntime:   runtime.NewInterpreterRuntime(runtime.Config{}),
+		logCollection: logCollectionHook,
+		logger:        logger,
 	}
 }
 
@@ -269,6 +324,14 @@ func (r *TestRunner) invokeTestFunction(inter *interpreter.Interpreter, funcName
 	return err
 }
 
+// Logs returns all the log messages from the script environment that
+// test cases run. Unit tests run in this environment too, so the
+// logs from their respective contracts, also appear in the resulting
+// string slice.
+func (r *TestRunner) Logs() []string {
+	return r.logCollection.Logs
+}
+
 func recoverPanics(onError func(error)) {
 	r := recover()
 	switch r := r.(type) {
@@ -288,7 +351,7 @@ func (r *TestRunner) parseCheckAndInterpret(script string) (*interpreter.Program
 	env := runtime.NewBaseInterpreterEnvironment(config)
 
 	ctx := runtime.Context{
-		Interface:   newScriptEnvironment(),
+		Interface:   newScriptEnvironment(r.logger),
 		Location:    testScriptLocation,
 		Environment: env,
 	}
@@ -490,14 +553,11 @@ func (r *TestRunner) interpreterImportHandler(ctx runtime.Context) interpreter.I
 
 // newScriptEnvironment creates an environment for test scripts to run.
 // Leverages the functionality of FVM.
-func newScriptEnvironment() environment.Environment {
+func newScriptEnvironment(logger zerolog.Logger) environment.Environment {
 	vm := fvm.NewVirtualMachine()
 	ctx := fvm.NewContext(fvm.WithLogger(zerolog.Nop()))
 	snapshotTree := testutil.RootBootstrappedLedger(vm, ctx)
 	environmentParams := environment.DefaultEnvironmentParams()
-	logger := zerolog.New(
-		zerolog.ConsoleWriter{Out: os.Stdout},
-	).With().Timestamp().Logger()
 	environmentParams.ProgramLoggerParams = environment.ProgramLoggerParams{
 		Logger:                logger,
 		CadenceLoggingEnabled: true,