diff --git a/panic_test.go b/panic_test.go
new file mode 100644
index 00000000..2977450b
--- /dev/null
+++ b/panic_test.go
@@ -0,0 +1,61 @@
+package chi
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestPanicOnUnclosedBrace(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Error("expected panic()")
+		}
+	}()
+
+	r := NewRouter()
+	r.Get("/{open", func(w http.ResponseWriter, r *http.Request) {})
+}
+
+func TestPanicOnDuplicateParamKey(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Error("expected panic()")
+		}
+	}()
+
+	r := NewRouter()
+	r.Get("/{id}/things/{id}", func(w http.ResponseWriter, r *http.Request) {})
+}
+
+func TestPanicOnInvalidRegexp(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Error("expected panic()")
+		}
+	}()
+
+	r := NewRouter()
+	r.Get("/{id:(abc}", func(w http.ResponseWriter, r *http.Request) {})
+}
+
+func TestPanicOnNilRouteHandler(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Error("expected panic()")
+		}
+	}()
+
+	r := NewRouter()
+	r.Route("/path", nil)
+}
+
+func TestPanicOnNilMountHandler(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Error("expected panic()")
+		}
+	}()
+
+	r := NewRouter()
+	r.Mount("/path", nil)
+}