search: add tests for drawTable

Makefile

@@ -6,6 +6,7 @@ build:
 
 test:
 	go test -v ./internal/chess
+	go test -v ./internal/search
 
 perft-test:
 	go test -v ./internal/perft/

internal/search/drawtable_test.go

@@ -0,0 +1,42 @@
+package search
+
+import "testing"
+
+const hash uint64 = 16046803855257665054
+
+func TestPush(t *testing.T) {
+	table := newDrawTable()
+
+	table.Push(hash)
+	retrieved := table.hashes[0]
+	if retrieved != hash {
+		t.Fatalf("%s: expected hash '%v' got '%v'", t.Name(), hash, retrieved)
+	}
+}
+
+func TestPop(t *testing.T) {
+	table := newDrawTable()
+	table.Push(hash)
+	popped, ok := table.Pop()
+	t.Log("ok:", ok)
+	if popped != hash {
+		t.Fatalf("%s: expected hash '%v' got '%v'", t.Name(), hash, popped)
+	}
+}
+
+func TestIsRepeat(t *testing.T) {
+	table := newDrawTable()
+
+	table.Push(hash)
+	table.Push(hash)
+
+	if table.IsRepeat(hash) != false {
+		t.Fatalf("%s: expected not be a draw but one was found", t.Name())
+	}
+
+	table.Push(hash)
+
+	if table.IsRepeat(hash) != true {
+		t.Fatalf("%s: expected to be a draw but one was not found", t.Name())
+	}
+}