feat: add temperature unit conversions (#5315)

Co-authored-by: Bama Charan Chhandogi <b.c.chhandogi@gmail.com>

src/test/java/com/thealgorithms/conversions/UnitConversionsTest.java

@@ -0,0 +1,48 @@
+package com.thealgorithms.conversions;
+
+import static java.util.Map.entry;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class UnitConversionsTest {
+    private static void addData(Stream.Builder<Arguments> builder, Map<String, Double> values) {
+        for (final var first : values.entrySet()) {
+            for (final var second : values.entrySet()) {
+                if (!first.getKey().equals(second.getKey())) {
+                    builder.add(Arguments.of(first.getKey(), second.getKey(), first.getValue(), second.getValue()));
+                }
+            }
+        }
+    }
+
+    private static Stream<Arguments> temperatureData() {
+        final Map<String, Double> boilingPointOfWater = Map.ofEntries(entry("Celsius", 99.9839), entry("Fahrenheit", 211.97102), entry("Kelvin", 373.1339), entry("Réaumur", 79.98712), entry("Delisle", 0.02415), entry("Rankine", 671.64102));
+
+        final Map<String, Double> freezingPointOfWater = Map.ofEntries(entry("Celsius", 0.0), entry("Fahrenheit", 32.0), entry("Kelvin", 273.15), entry("Réaumur", 0.0), entry("Delisle", 150.0), entry("Rankine", 491.67));
+
+        Stream.Builder<Arguments> builder = Stream.builder();
+        addData(builder, boilingPointOfWater);
+        addData(builder, freezingPointOfWater);
+        return builder.build();
+    }
+
+    @ParameterizedTest
+    @MethodSource("temperatureData")
+    void testTemperature(String inputUnit, String outputUnit, double value, double expected) {
+        final double result = UnitConversions.TEMPERATURE.convert(inputUnit, outputUnit, value);
+        assertEquals(expected, result, 0.00001);
+    }
+
+    @Test
+    void testTemperatureUnits() {
+        final Set<String> expectedUnits = Set.of("Celsius", "Fahrenheit", "Kelvin", "Réaumur", "Rankine", "Delisle");
+        assertEquals(expectedUnits, UnitConversions.TEMPERATURE.availableUnits());
+    }
+}

src/test/java/com/thealgorithms/conversions/UnitsConverterTest.java

@@ -0,0 +1,18 @@
+package com.thealgorithms.conversions;
+
+import static java.util.Map.entry;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Map;
+import org.apache.commons.lang3.tuple.Pair;
+import org.junit.jupiter.api.Test;
+
+public class UnitsConverterTest {
+
+    @Test
+    void testConvertThrowsForSameUnits() {
+        final UnitsConverter someConverter = new UnitsConverter(Map.ofEntries(entry(Pair.of("A", "B"), new AffineConverter(10.0, -20.0))));
+        assertThrows(IllegalArgumentException.class, () -> someConverter.convert("A", "A", 20.0));
+        assertThrows(IllegalArgumentException.class, () -> someConverter.convert("B", "B", 20.0));
+    }
+}