1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/utils/glyph_hash.test.ts b/src/lib/utils/glyph_hash.test.ts
new file mode 100644
index 0000000..5f57a2a
--- /dev/null
+++ b/src/lib/utils/glyph_hash.test.ts
@@ -0,0 +1,68 @@
+import { getGlyphHash } from './glyph_hash';
+import type { GlyphHash } from './glyph_hash';
+
+type TestState = {
+  glyphHash?: GlyphHash
+};
+
+
+describe('Glyph Hash utility', () => {
+
+  test('it throws an exception if the string is too short', () => {
+
+    expect(() => {
+
+      getGlyphHash('short');
+    }).toThrow();
+
+    expect(() => {
+
+      getGlyphHash('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
+    }).toThrow();
+
+    expect(() => {
+
+      getGlyphHash('abcdefghijklmnopqrstuvwxyzABCDEF');
+    }).not.toThrow();
+  });
+
+  test('it treats UUIDs with hyphens the same as those without', () => {
+
+    const uuidWithHyphens = 'f7722355-2285-46c0-a55f-3483a826f3a6';
+    const uuidWithoutHyphens = 'f7722355228546c0a55f3483a826f3a6';
+
+    expect(getGlyphHash(uuidWithHyphens)).toEqual(getGlyphHash(uuidWithoutHyphens));
+  });
+
+  describe('it generates four sets of glyphs and colors', () => {
+
+    const state: TestState = {};
+
+    beforeEach(() => {
+
+      state.glyphHash = getGlyphHash('f7722355-2285-46c0-a55f-3483a826f3a6');
+    });
+
+    test('there should be four glyph fragments', () => {
+
+      expect(state.glyphHash.length).toBe(4);
+    });
+
+    test('each fragment should have a single character glyph', () => {
+
+      for (const glyphHashFragment of state.glyphHash) {
+        expect(typeof glyphHashFragment.glyph).toBe('string');
+        expect(glyphHashFragment.glyph.length).toBe(1);
+      }
+    });
+
+    test('each fragment should have a hexadecimal color', () => {
+
+      for (const glyphHashFragment of state.glyphHash) {
+        expect(typeof glyphHashFragment.color).toBe('string');
+        expect(glyphHashFragment.color.length).toBe(7);
+        expect(glyphHashFragment.color).toEqual(expect.stringMatching(/#[0-9a-f]{6}/));
+      }
+    });
+  });
+});