check the default user cachedir if GOCACHE is not explicitly set

tools/osutils/run_test.go

@@ -0,0 +1,45 @@
+package osutils
+
+import (
+	"os"
+	"strconv"
+	"testing"
+)
+
+func TestIsProbablyGoRun(t *testing.T) {
+	scenarios := []struct {
+		arg0     string
+		runDirs  []string
+		expected bool
+	}{
+		{"", nil, false},
+		{"/a/b", nil, false},
+		{"/a/b", []string{""}, false},
+		{"/a/b", []string{"/b/"}, false},
+		{"/a/b", []string{"/a/"}, true},
+		{"/a/b", []string{"", "/b/", "/a/"}, true},
+	}
+
+	originalArgs := os.Args
+	defer func() {
+		os.Args = originalArgs
+	}()
+
+	originalRunDirs := runDirs
+	defer func() {
+		runDirs = originalRunDirs
+	}()
+
+	for i, s := range scenarios {
+		t.Run(strconv.Itoa(i)+"_"+s.arg0, func(t *testing.T) {
+			os.Args = []string{s.arg0}
+			runDirs = s.runDirs
+
+			result := IsProbablyGoRun()
+
+			if result != s.expected {
+				t.Fatalf("Expected %v, got %v", s.expected, result)
+			}
+		})
+	}
+}