Add tests

1 files changed, 95 insertions, 0 deletions

diff --git a/gson/src/test/java/moe/nea/jcp/gson/test/TestBasic.java b/gson/src/test/java/moe/nea/jcp/gson/test/TestBasic.java
new file mode 100644
index 0000000..c0e42b6
--- /dev/null
+++ b/gson/src/test/java/moe/nea/jcp/gson/test/TestBasic.java
@@ -0,0 +1,95 @@
+package moe.nea.jcp.gson.test;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import moe.nea.jcp.gson.GsonCodecs;
+import moe.nea.jcp.gson.GsonOperations;
+import moe.nea.pcj.Decode;
+import moe.nea.pcj.Result;
+import moe.nea.pcj.json.JsonLikeError;
+import moe.nea.pcj.json.JsonLikeOperations;
+import moe.nea.pcj.json.MissingKey;
+import moe.nea.pcj.json.RecordJoiners;
+import moe.nea.pcj.json.UnexpectedJsonElement;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.stream.Collectors;
+
+public class TestBasic {
+	private <T> void assertFail(Result<T, ?> result, JsonLikeError... expectedError) {
+		if (result.isOk())
+			throw new AssertionError("Expected fail");
+		Assertions.assertEquals(
+				Arrays.stream(expectedError).collect(Collectors.toSet()),
+				new HashSet<>(result.errors())
+		);
+	}
+
+	private <T> void assertSuccess(Result<T, ?> result, T expected) {
+		for (Object error : result.errors()) {
+			throw new AssertionError(error.toString());
+		}
+		Assertions.assertEquals(expected, result.valueOrPartial().get());
+	}
+
+	<T> Result<T, JsonLikeError> decode(Decode<T, JsonElement, JsonLikeOperations<JsonElement>, JsonLikeError> decode, JsonElement element) {
+		return Result.cast(decode.decode(element, GsonOperations.INSTANCE));
+	}
+
+	GsonCodecs codecs = GsonCodecs.INSTANCE;
+
+	@Test
+	void testString() {
+		assertSuccess(decode(codecs.STRING, new JsonPrimitive("test")), "test");
+	}
+
+	@Test
+	void testInt() {
+		assertSuccess(decode(codecs.INTEGER, new JsonPrimitive(1000)), 1000);
+		assertFail(decode(codecs.INTEGER, new JsonPrimitive("hehehe")),
+		           new UnexpectedJsonElement("number", mkPrim("hehehe")));
+		assertFail(decode(codecs.INTEGER, new JsonPrimitive("1")),
+		           new UnexpectedJsonElement("number", mkPrim("1")));
+	}
+
+	record TestObject(
+			String foo,
+			int bar
+	) {}
+
+	static JsonElement mkPrim(Object arg) {
+		if (arg instanceof JsonElement el) return el;
+		if (arg instanceof String str) return new JsonPrimitive(str);
+		if (arg instanceof Number num) return new JsonPrimitive(num);
+		if (arg == null) return JsonNull.INSTANCE;
+		if (arg instanceof Boolean b) return new JsonPrimitive(b);
+		throw new IllegalArgumentException("Cannot convert " + arg + " to json object");
+	}
+
+	static JsonObject mkJsonObject(Object... args) {
+		JsonObject obj = new JsonObject();
+		for (int i = 0; i < args.length; i += 2) {
+			obj.add((String) args[i], mkPrim(args[i + 1]));
+		}
+		return obj;
+	}
+
+	@Test
+	void testObject() {
+		var codec = RecordJoiners.join(
+				codecs.STRING.fieldOf("foo").withGetter(TestObject::foo),
+				codecs.INTEGER.fieldOf("bar").withGetter(TestObject::bar),
+				TestObject::new
+		);
+		assertSuccess(decode(codec, mkJsonObject("foo", "fooValue", "bar", -10)),
+		              new TestObject("fooValue", -10));
+		assertFail(decode(codec, mkJsonObject("foo", "fooValue")),
+		           new MissingKey("bar"));
+	}
+}
+