New class for simpler sequence write support.

2026-05-28 00:00:03 -04:00 · 2026-03-13 11:37:47 +01:00
parent 263fb75d1d
commit 10183ef830
2 changed files with 204 additions and 0 deletions
@@ -0,0 +1,89 @@
+package com.twelvemonkeys.imageio.util;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class SequenceSupportTest {
+    @Test
+    void happyCase() {
+        SequenceSupport sequence = new SequenceSupport();
+
+        sequence.start();
+        assertEquals(0, sequence.current());
+
+        for (int i = 0; i < Byte.MAX_VALUE; i++) {
+            assertEquals(i, sequence.advance());
+            assertEquals(i + 1, sequence.current());
+        }
+
+        assertEquals(127, sequence.end());
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::advance);
+    }
+
+    @Test
+    void reset() {
+        SequenceSupport sequence = new SequenceSupport();
+        sequence.reset();
+
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::end);
+
+        sequence.start();
+        sequence.reset();
+
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::end);
+
+        sequence.start();
+        sequence.advance();
+        sequence.reset();
+
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::end);
+
+        sequence.start();
+        sequence.end();
+        sequence.reset();
+
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::end);
+    }
+
+    @Test
+    void startEnd() {
+        SequenceSupport sequence = new SequenceSupport();
+        sequence.start();
+        sequence.end();
+
+        assertEquals(-1, sequence.current());
+        assertThrows(IllegalStateException.class, sequence::end);
+    }
+
+    @Test
+    void startAlreadyStarted() {
+        SequenceSupport sequence = new SequenceSupport();
+        sequence.start();
+
+        assertThrows(IllegalStateException.class, sequence::start);
+    }
+
+    @Test
+    void advanceNotStarted() {
+        SequenceSupport sequence = new SequenceSupport();
+        assertThrows(IllegalStateException.class, sequence::advance);
+    }
+
+    @Test
+    void currentNotStarted() {
+        SequenceSupport sequence = new SequenceSupport();
+        assertEquals(-1, sequence.current());
+    }
+
+    @Test
+    void endNotStarted() {
+        SequenceSupport sequence = new SequenceSupport();
+        assertThrows(IllegalStateException.class, sequence::end);
+    }
+}