alot more changes

internal/sourcemaps/store_test.go

@@ -22,3 +22,29 @@ func TestReloadFromDisk(t *testing.T) {
 		t.Fatalf("frames = %+v", frames)
 	}
 }
+
+func TestLazyLoadAndEviction(t *testing.T) {
+	dir := t.TempDir()
+	r, _ := New(dir)
+	for _, f := range []string{"a", "b", "c"} {
+		if err := r.Upload("rel", "/assets/"+f+".js", strings.NewReader(testMap)); err != nil {
+			t.Fatal(err)
+		}
+	}
+	r2, _ := New(dir)
+	if len(r2.cache) != 0 || len(r2.List()) != 3 {
+		t.Fatalf("startup should index without parsing: cached=%d listed=%d", len(r2.cache), len(r2.List()))
+	}
+	r2.maxBytes = int64(len(testMap)) * 2 // room for two parsed maps
+	for _, f := range []string{"a", "b", "c"} {
+		if fr := r2.ResolveFrames("rel", "at f (https://h/assets/"+f+".js:2:1)"); len(fr) != 1 || fr[0].Status != "mapped" {
+			t.Fatalf("%s not resolved: %+v", f, fr)
+		}
+	}
+	if len(r2.cache) != 2 {
+		t.Fatalf("cache should hold 2 entries, has %d", len(r2.cache))
+	}
+	if r2.get(key("rel", "/assets/a.js")) == nil { // evicted, reloads from disk
+		t.Fatal("evicted map did not reload")
+	}
+}