diff --git a/tests/carddatabase/filter_tree_test.cpp b/tests/carddatabase/filter_tree_test.cpp
index 0a192126c..c6fcdfe0a 100644
--- a/tests/carddatabase/filter_tree_test.cpp
+++ b/tests/carddatabase/filter_tree_test.cpp
@@ -2,6 +2,7 @@
 #include "libcockatrice/card/database/card_database.h"
 #include "libcockatrice/card/database/card_database_querier.h"
 #include "libcockatrice/card/set/card_set.h"
+#include "libcockatrice/filters/filter_tree.h"
 #include "test_card_database_path_provider.h"
 
 #include "gtest/gtest.h"
@@ -20,7 +21,6 @@
 
 namespace
 {
-
 class FilterTreeTest : public ::testing::Test
 {
 protected:
@@ -30,22 +30,185 @@ protected:
                                             new TestCardDatabasePathProvider(), new NoopCardSetPriorityController());
         db->loadCardDatabases();
 
-        cat = db->query()->getCardBySimpleName("Cat");
-        notDeadAfterAll = db->query()->getCardBySimpleName("Not Dead");
+        language = CardSearchLanguage{};
+
+        island = db->query()->getCardBySimpleName("Island");
+        artifact = db->query()->getCardBySimpleName("Artifact");
         truth = db->query()->getCardBySimpleName("Truth");
-        doctor = db->query()->getCardBySimpleName("Doctor");
+        notDead = db->query()->getCardBySimpleName("Not Dead");
+        wallOfDenial = db->query()->getCardBySimpleName("Wall of Denial");
+        maelstromAngel = db->query()->getCardBySimpleName("Maelstrom Archangel");
     }
-    // void TearDown() override {}
 
-    CardData cat;
-    CardData notDeadAfterAll;
-    CardData truth;
-    CardData doctor;
+    CardSearchLanguage language;
+
+    CardData island;         // c/u
+    CardData artifact;       // c
+    CardData truth;          // u
+    CardData notDead;        // b
+    CardData wallOfDenial;   // wu
+    CardData maelstromAngel; // wubrg
 };
+} // namespace
 
-TEST_F(FilterTreeTest, TestOne)
+// =====================================================================================================================
+// acceptColor
+// =====================================================================================================================
+
+TEST_F(FilterTreeTest, Color)
 {
-    ASSERT_TRUE(true);
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "wu");
+    ASSERT_FALSE(filterTree.acceptsCard(island, language));
+    ASSERT_FALSE(filterTree.acceptsCard(artifact, language));
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_TRUE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorColorless)
+{
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "c");
+    ASSERT_TRUE(filterTree.acceptsCard(island, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_FALSE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_FALSE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorNot)
+{
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAndNot, "b");
+    ASSERT_TRUE(filterTree.acceptsCard(island, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    ASSERT_TRUE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_FALSE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorAliases)
+{
+    FilterTree filterTree;
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "green");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(maelstromAngel, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "grn");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(maelstromAngel, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "blue");
+    ASSERT_TRUE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "blu");
+    ASSERT_TRUE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "black");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(notDead, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "blk");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(notDead, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "red");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(maelstromAngel, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "white");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "wht");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "colorless");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "colourless");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    filterTree.clear();
+
+    filterTree.termNode(CardFilter::Attr::AttrColor, CardFilter::Type::TypeAnd, "none");
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    filterTree.clear();
+}
+
+// =====================================================================================================================
+// acceptColorIdentity
+// =====================================================================================================================
+
+TEST_F(FilterTreeTest, ColorIdentity)
+{
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAnd, "wu");
+    ASSERT_FALSE(filterTree.acceptsCard(island, language));
+    ASSERT_FALSE(filterTree.acceptsCard(artifact, language));
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_TRUE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorIdentityColorless)
+{
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAnd, "c");
+    ASSERT_FALSE(filterTree.acceptsCard(island, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    ASSERT_FALSE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_FALSE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_FALSE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorIdentityNot)
+{
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAndNot, "b");
+    ASSERT_TRUE(filterTree.acceptsCard(island, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    ASSERT_TRUE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_FALSE(filterTree.acceptsCard(maelstromAngel, language));
+}
+
+TEST_F(FilterTreeTest, ColorIdentityMultiple)
+{
+    // Simulate a WU commander.
+    FilterTree filterTree;
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAndNot, "b");
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAndNot, "r");
+    filterTree.termNode(CardFilter::Attr::AttrColorIdentity, CardFilter::Type::TypeAndNot, "g");
+    ASSERT_TRUE(filterTree.acceptsCard(island, language));
+    ASSERT_TRUE(filterTree.acceptsCard(artifact, language));
+    ASSERT_TRUE(filterTree.acceptsCard(truth, language));
+    ASSERT_FALSE(filterTree.acceptsCard(notDead, language));
+    ASSERT_TRUE(filterTree.acceptsCard(wallOfDenial, language));
+    ASSERT_FALSE(filterTree.acceptsCard(maelstromAngel, language));
 }
 
 int main(int argc, char **argv)
@@ -53,4 +216,3 @@ int main(int argc, char **argv)
     ::testing::InitGoogleTest(&argc, argv);
     return RUN_ALL_TESTS();
 }
-}