1 files changed, 66 insertions, 0 deletions
diff --git a/src/cmd/go/internal/toolchain/toolchain_test.go b/src/cmd/go/internal/toolchain/toolchain_test.go
new file mode 100644
index 0000000..e8ed566
--- /dev/null
+++ b/src/cmd/go/internal/toolchain/toolchain_test.go
@@ -0,0 +1,66 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package toolchain
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestNewerToolchain(t *testing.T) {
+	for _, tt := range newerToolchainTests {
+		out, err := newerToolchain(tt.need, tt.list)
+		if (err != nil) != (out == "") {
+			t.Errorf("newerToolchain(%v, %v) = %v, %v, want error", tt.need, tt.list, out, err)
+			continue
+		}
+		if out != tt.out {
+			t.Errorf("newerToolchain(%v, %v) = %v, %v want %v, nil", tt.need, tt.list, out, err, tt.out)
+		}
+	}
+}
+
+var f = strings.Fields
+
+var relRC = []string{"1.39.0", "1.39.1", "1.39.2", "1.40.0", "1.40.1", "1.40.2", "1.41rc1"}
+var rel2 = []string{"1.39.0", "1.39.1", "1.39.2", "1.40.0", "1.40.1", "1.40.2"}
+var rel0 = []string{"1.39.0", "1.39.1", "1.39.2", "1.40.0"}
+var newerToolchainTests = []struct {
+	need string
+	list []string
+	out  string
+}{
+	{"1.30", rel0, "go1.39.2"},
+	{"1.30", rel2, "go1.39.2"},
+	{"1.30", relRC, "go1.39.2"},
+	{"1.38", rel0, "go1.39.2"},
+	{"1.38", rel2, "go1.39.2"},
+	{"1.38", relRC, "go1.39.2"},
+	{"1.38.1", rel0, "go1.39.2"},
+	{"1.38.1", rel2, "go1.39.2"},
+	{"1.38.1", relRC, "go1.39.2"},
+	{"1.39", rel0, "go1.39.2"},
+	{"1.39", rel2, "go1.39.2"},
+	{"1.39", relRC, "go1.39.2"},
+	{"1.39.2", rel0, "go1.39.2"},
+	{"1.39.2", rel2, "go1.39.2"},
+	{"1.39.2", relRC, "go1.39.2"},
+	{"1.39.3", rel0, "go1.40.0"},
+	{"1.39.3", rel2, "go1.40.2"},
+	{"1.39.3", relRC, "go1.40.2"},
+	{"1.40", rel0, "go1.40.0"},
+	{"1.40", rel2, "go1.40.2"},
+	{"1.40", relRC, "go1.40.2"},
+	{"1.40.1", rel0, ""},
+	{"1.40.1", rel2, "go1.40.2"},
+	{"1.40.1", relRC, "go1.40.2"},
+	{"1.41", rel0, ""},
+	{"1.41", rel2, ""},
+	{"1.41", relRC, "go1.41rc1"},
+	{"1.41.0", rel0, ""},
+	{"1.41.0", rel2, ""},
+	{"1.41.0", relRC, ""},
+	{"1.40", nil, ""},
+}