Add numwant provider class

src/main/java/org/araymond/joal/core/client/emulated/generator/numwant/NumwantProvider.java

@@ -0,0 +1,29 @@
+package org.araymond.joal.core.client.emulated.generator.numwant;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Created by raymo on 19/07/2017.
+ */
+public class NumwantProvider {
+
+    private final Integer numwant;
+    private final Integer numwantOnStop;
+
+    public NumwantProvider(final Integer numwant, final Integer numwantOnStop) {
+        Preconditions.checkNotNull(numwant, "numwant must not be null.");
+        Preconditions.checkArgument(numwant > 0, "numwant must be at least 1.");
+        Preconditions.checkNotNull(numwantOnStop, "numwantOnStop must not be null.");
+        Preconditions.checkArgument(numwantOnStop >= 0, "numwantOnStop must be at least 0.");
+        this.numwant = numwant;
+        this.numwantOnStop = numwantOnStop;
+    }
+
+    public Integer getNumwant() {
+        return numwant;
+    }
+
+    public Integer getNumwantOnStop() {
+        return numwantOnStop;
+    }
+}

src/test/java/org/araymond/joal/core/client/emulated/generator/numwant/NumwantProviderTest.java

@@ -0,0 +1,63 @@
+package org.araymond.joal.core.client.emulated.generator.numwant;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+/**
+ * Created by raymo on 19/07/2017.
+ */
+public class NumwantProviderTest {
+
+    @Test
+    public void shouldNotBuildWithoutNumwant() {
+        assertThatThrownBy(() -> new NumwantProvider(null, 0))
+                .isInstanceOf(NullPointerException.class)
+                .hasMessage("numwant must not be null.");
+    }
+
+    @Test
+    public void shouldNotBuildWithNumwantLessThanOne() {
+        assertThatThrownBy(() -> new NumwantProvider(0, 0))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("numwant must be at least 1.");
+    }
+
+    @Test
+    public void shouldBuildWithNumwantEqualsOne() {
+        final NumwantProvider numwantProvider = new NumwantProvider(1, 0);
+
+        assertThat(numwantProvider.getNumwant()).isEqualTo(1);
+    }
+
+    @Test
+    public void shouldNotBuildWithoutNumwantOnStop() {
+        assertThatThrownBy(() -> new NumwantProvider(200, null))
+                .isInstanceOf(NullPointerException.class)
+                .hasMessage("numwantOnStop must not be null.");
+    }
+
+    @Test
+    public void shouldNotBuildWithNumwantOnStopLessThanZero() {
+        assertThatThrownBy(() -> new NumwantProvider(200, -1))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("numwantOnStop must be at least 0.");
+    }
+
+    @Test
+    public void shouldBuildWithNumwantOnStopEqualsZero() {
+        final NumwantProvider numwantProvider = new NumwantProvider(200, 0);
+
+        assertThat(numwantProvider.getNumwantOnStop()).isEqualTo(0);
+    }
+
+    @Test
+    public void shouldBuild() {
+        final NumwantProvider numwantProvider = new NumwantProvider(200, 0);
+
+        assertThat(numwantProvider.getNumwant()).isEqualTo(200);
+        assertThat(numwantProvider.getNumwantOnStop()).isEqualTo(0);
+    }
+
+}