Merge pull request #15513 from danielmcnally285/danielmcnally285_string_to_long

BAEL-7368 - String to Long

core-java-modules/core-java-string-conversions-3/src/test/java/com/baeldung/stringtolong/StringToLongPrimitiveOrLongObjectUnitTest.java

@@ -0,0 +1,89 @@
+package com.baeldung.stringtolong;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.apache.commons.lang3.math.NumberUtils;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.primitives.Longs;
+
+public class StringToLongPrimitiveOrLongObjectUnitTest {
+
+    @Test
+    void givenString_whenUsingLongConstructor_thenObtainLongObject() {
+        Long l = new Long("2147483648");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingLongConstructor_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> new Long("Invalid String"));
+    }
+
+    @Test
+    void givenString_whenUsingLongValueOf_thenObtainLongObject() {
+        Long l = Long.valueOf("2147483648");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingLongValueOf_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> Long.valueOf("Invalid String"));
+    }
+
+    @Test
+    void givenString_whenUsingParseLong_thenObtainLongPrimitive() {
+        long l = Long.parseLong("2147483648");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingParseLong_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> Long.parseLong("Invalid String"));
+    }
+
+    @Test
+    void givenHexadecimalString_whenUsingLongDecode_thenObtainLongObject() {
+        Long l = Long.decode("0x80000000");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingLongDecode_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> Long.decode("Invalid String"));
+    }
+
+    @Test
+    void givenHexadecimalString_whenUsingApacheCommonsNumberUtils_thenObtainLongObject() {
+        Long l = NumberUtils.createLong("0x80000000");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingApacheCommonsNumberUtils_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> NumberUtils.createLong("Invalid String"));
+    }
+
+    @Test
+    void givenString_whenUsingParseUnsignedLong_thenObtainUnsignedLongObject() {
+        Long l = Long.parseUnsignedLong("9223372036854775808");
+        assertThat(Long.toUnsignedString(l)).isEqualTo("9223372036854775808");
+    }
+
+    @Test
+    void givenInvalidString_whenUsingParseUnsignedLong_thenNumberFormatExceptionThrown() {
+        Assertions.assertThrows(NumberFormatException.class, () -> Long.parseUnsignedLong("Invalid String"));
+    }
+
+    @Test
+    void givenString_whenUsingGuavaLongs_thenObtainLongObject() {
+        Long l = Longs.tryParse("2147483648");
+        assertThat(l).isEqualTo(2147483648L);
+    }
+
+    @Test
+    void givenInvalidString_whenUsingGuavaLongs_thenObtainNull() {
+        assertThat(Longs.tryParse("Invalid String")).isNull();
+    }
+}