diff --git a/src/modules/geography/tests/unit/infrastructure/postgres-direction-encoder.spec.ts b/src/modules/geography/tests/unit/infrastructure/postgres-direction-encoder.spec.ts
new file mode 100644
index 0000000..6f12ed5
--- /dev/null
+++ b/src/modules/geography/tests/unit/infrastructure/postgres-direction-encoder.spec.ts
@@ -0,0 +1,41 @@
+import { Coordinates } from '@modules/geography/core/application/types/coordinates.type';
+import { PostgresDirectionEncoder } from '@modules/geography/infrastructure/postgres-direction-encoder';
+
+describe('Postgres direction encoder', () => {
+  it('should be defined', () => {
+    const postgresDirectionEncoder: PostgresDirectionEncoder =
+      new PostgresDirectionEncoder();
+    expect(postgresDirectionEncoder).toBeDefined();
+  });
+  it('should encode coordinates to a postgres direction', () => {
+    const postgresDirectionEncoder: PostgresDirectionEncoder =
+      new PostgresDirectionEncoder();
+    const coordinates: Coordinates[] = [
+      {
+        lon: 6,
+        lat: 47,
+      },
+      {
+        lon: 6.1,
+        lat: 47.1,
+      },
+      {
+        lon: 6.2,
+        lat: 47.2,
+      },
+    ];
+    const direction = postgresDirectionEncoder.encode(coordinates);
+    expect(direction).toBe("'LINESTRING(6 47,6.1 47.1,6.2 47.2)'");
+  });
+  it('should decode a postgres direction to coordinates', () => {
+    const postgresDirectionEncoder: PostgresDirectionEncoder =
+      new PostgresDirectionEncoder();
+    const direction = "'LINESTRING(6 47,6.1 47.1,6.2 47.2)'";
+    const coordinates: Coordinates[] =
+      postgresDirectionEncoder.decode(direction);
+    expect(coordinates.length).toBe(3);
+    expect(coordinates[0].lat).toBe(47);
+    expect(coordinates[1].lon).toBe(6.1);
+    expect(coordinates[2].lat).toBe(47.2);
+  });
+});