diff --git a/TopsortAnalytics/src/main/java/com/topsort/analytics/banners/run.kt b/TopsortAnalytics/src/main/java/com/topsort/analytics/banners/run.kt
index 8570923..fa0fc06 100644
--- a/TopsortAnalytics/src/main/java/com/topsort/analytics/banners/run.kt
+++ b/TopsortAnalytics/src/main/java/com/topsort/analytics/banners/run.kt
@@ -29,7 +29,7 @@ fun runBannerAuction(config: BannerConfig): BannerResponse? {
 }
 
 /**
- * Builds a low-leve Auction object to be run with TopsortAuctionHttpService.
+ * Builds a low-level Auction object to be run with TopsortAuctionHttpService.
  *
  * Generally, you shouldn't be calling this function yourself and you should use runBannerAuction instead.
  *
diff --git a/TopsortAnalytics/src/test/java/com/topsort/analytics/banners/runTest.kt b/TopsortAnalytics/src/test/java/com/topsort/analytics/banners/runTest.kt
new file mode 100644
index 0000000..5f3176a
--- /dev/null
+++ b/TopsortAnalytics/src/test/java/com/topsort/analytics/banners/runTest.kt
@@ -0,0 +1,56 @@
+package com.topsort.analytics.banners
+
+import org.assertj.core.api.Assertions.assertThat
+import org.json.JSONObject
+import org.junit.Test
+
+internal class RunTest {
+    @Test
+    fun buildLandingPageBanner() {
+        val slot = "slot"
+        val ids = listOf("id1", "id2")
+        val bannerConfig = BannerConfig.LandingPage(slotId = slot, ids = ids)
+        val bannerAuction = buildBannerAuction(bannerConfig);
+        val json = JSONObject.wrap(bannerAuction)!!.toString()
+        val expectedJson =
+            "{\"slots\":1,\"slotId\":\"$slot\",\"type\":\"banners\",\"device\":\"mobile\",\"products\":{\"ids\":[\"${ids[0]}\",\"${ids[1]}\"]}}"
+        assertThat(json).isEqualTo(expectedJson)
+    }
+
+    @Test
+    fun buildSingleCategoryBanner() {
+        val slot = "slot"
+        val category = "category"
+        val bannerConfig = BannerConfig.CategorySingle(slotId = slot, category = category)
+        val bannerAuction = buildBannerAuction(bannerConfig);
+        val json = JSONObject.wrap(bannerAuction)!!.toString()
+        val expectedJson =
+            "{\"slots\":1,\"slotId\":\"$slot\",\"category\":{\"id\":\"$category\"},\"type\":\"banners\",\"device\":\"mobile\"}}"
+        assertThat(json).isEqualTo(expectedJson)
+    }
+
+    @Test
+    fun buildMultipleCategoryBanner() {
+        val slot = "slot"
+        val categories = listOf("cat1", "cat2")
+        val bannerConfig = BannerConfig.CategoryMultiple(slotId = slot, categories = categories)
+        val bannerAuction = buildBannerAuction(bannerConfig);
+        val json = JSONObject.wrap(bannerAuction)!!.toString()
+        val expectedJson =
+            "{\"slots\":1,\"slotId\":\"$slot\",\"category\":{\"ids\":[\"${categories[0]}\",\"${categories[1]}\"]},\"type\":\"banners\",\"device\":\"mobile\"}}"
+        assertThat(json).isEqualTo(expectedJson)
+    }
+
+    @Test
+    fun buildDisjuctionsCategoryBanner() {
+        val slot = "slot"
+        val disjunctions = listOf(listOf("cat1", "cat2"), listOf("cat3"))
+        val bannerConfig =
+            BannerConfig.CategoryDisjunctions(slotId = slot, disjunctions = disjunctions)
+        val bannerAuction = buildBannerAuction(bannerConfig);
+        val json = JSONObject.wrap(bannerAuction)!!.toString()
+        val expectedJson =
+            "{\"slots\":1,\"slotId\":\"$slot\",\"category\":{\"disjunctions\":[[\"${disjunctions[0][0]}\",\"${disjunctions[0][1]}\"],[\"${disjunctions[1][0]}\"]]},\"type\":\"banners\",\"device\":\"mobile\"}}"
+        assertThat(json).isEqualTo(expectedJson)
+    }
+}
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