v0.26.3 web viewer improvement

internal/core/flow_test.go

@@ -0,0 +1,24 @@
+package core
+
+import "testing"
+
+// A line's level is its first whole word, in any case, naming a level, not the
+// most severe one named; a wanted level skips the names of the others.
+func TestLevelIsTheFirstWordNamingOne(t *testing.T) {
+	for _, c := range []struct {
+		text, want, level string
+		start, end        int
+	}{
+		{"warning disk full", "", "WARN", 0, 7},
+		{"DBG x", "", "DEBUG", 0, 3},
+		{"2026-10-05 [Info] retry after error", "", "INFO", 12, 16},
+		{`{"level":"fatal","msg":"x"}`, "", "ERROR", 10, 15},
+		{"terror informal x_ERR", "", "", 0, 0},
+		{"INFO then ERR", "ERROR", "ERROR", 10, 13},
+	} {
+		level, start, end := LevelWord(c.text, c.want)
+		if level != c.level || start != c.start || end != c.end {
+			t.Errorf("%q want %q: got %q [%d:%d], want %q [%d:%d]", c.text, c.want, level, start, end, c.level, c.start, c.end)
+		}
+	}
+}