prog, pkg/{csource,ifuzz,ipc,repro}: make tests deterministic on travis

Don't use random seed on travis as it produces flaky coverage reports,
and probably generally better for CI setting.

pkg/csource/csource_test.go

@@ -61,6 +61,9 @@ func TestGenerate(t *testing.T) {
 
 func testTarget(t *testing.T, target *prog.Target, full bool) {
 	seed := int64(time.Now().UnixNano())
+	if os.Getenv("TRAVIS") != "" {
+		seed = 0 // required for deterministic coverage reports
+	}
 	rs := rand.NewSource(seed)
 	t.Logf("seed=%v", seed)
 	p := target.Generate(rs, 10, nil)

pkg/ifuzz/ifuzz_test.go

@@ -6,6 +6,7 @@ package ifuzz_test
 import (
 	"encoding/hex"
 	"math/rand"
+	"os"
 	"testing"
 	"time"
 
@@ -36,6 +37,9 @@ func TestMode(t *testing.T) {
 
 func TestDecode(t *testing.T) {
 	seed := int64(time.Now().UnixNano())
+	if os.Getenv("TRAVIS") != "" {
+		seed = 0 // required for deterministic coverage reports
+	}
 	t.Logf("seed=%v", seed)
 	r := rand.New(rand.NewSource(seed))
 

pkg/ipc/ipc_test.go

@@ -38,6 +38,9 @@ func initTest(t *testing.T) (*prog.Target, rand.Source, int, EnvFlags) {
 		iters = 10
 	}
 	seed := int64(time.Now().UnixNano())
+	if os.Getenv("TRAVIS") != "" {
+		seed = 0 // required for deterministic coverage reports
+	}
 	rs := rand.NewSource(seed)
 	t.Logf("seed=%v", seed)
 	target, err := prog.GetTarget(runtime.GOOS, runtime.GOARCH)

pkg/repro/repro_test.go

@@ -5,6 +5,7 @@ package repro
 
 import (
 	"math/rand"
+	"os"
 	"testing"
 	"time"
 
@@ -18,6 +19,9 @@ func initTest(t *testing.T) (*rand.Rand, int) {
 		iters = 100
 	}
 	seed := int64(time.Now().UnixNano())
+	if os.Getenv("TRAVIS") != "" {
+		seed = 0 // required for deterministic coverage reports
+	}
 	rs := rand.NewSource(seed)
 	t.Logf("seed=%v", seed)
 	return rand.New(rs), iters

prog/export_test.go

@@ -6,6 +6,7 @@ package prog
 import (
 	"fmt"
 	"math/rand"
+	"os"
 	"testing"
 	"time"
 )
@@ -32,6 +33,9 @@ func initTargetTest(t *testing.T, os, arch string) *Target {
 
 func randSource(t *testing.T) rand.Source {
 	seed := int64(time.Now().UnixNano())
+	if os.Getenv("TRAVIS") != "" {
+		seed = 0 // required for deterministic coverage reports
+	}
 	t.Logf("seed=%v", seed)
 	return rand.NewSource(seed)
 }

prog/prog_test.go

@@ -9,7 +9,6 @@ import (
 	"math/rand"
 	"strings"
 	"testing"
-	"time"
 )
 
 func TestGeneration(t *testing.T) {
@@ -144,9 +143,7 @@ func TestCrossTarget(t *testing.T) {
 }
 
 func testCrossTarget(t *testing.T, target *Target, crossTargets []*Target) {
-	seed := int64(time.Now().UnixNano())
-	t.Logf("seed=%v", seed)
-	rs := rand.NewSource(seed)
+	rs := randSource(t)
 	iters := 100
 	if testing.Short() {
 		iters /= 10