Tests for filter builder

src/main/kotlin/io/supabase/postgrest/builder/PostgrestBuilder.kt

@@ -57,6 +57,10 @@ open class PostgrestBuilder<T : Any> {
         this.body = body
     }
 
+    fun getSearchParams(): Map<String, String> {
+        return searchParams
+    }
+
     fun execute(): PostgrestHttpResponse {
         checkNotNull(method) { "Method cannot be null" }
 

src/test/kotlin/io/supabase/postgrest/builder/PostgrestFilterBuilderTest.kt

@@ -0,0 +1,59 @@
+package io.supabase.postgrest.builder
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import io.mockk.mockk
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+internal class PostgrestFilterBuilderTest {
+
+    private val postgrestBuilderMock = mockk<PostgrestBuilder<Any>>()
+    private var filterBuilder: PostgrestFilterBuilder<Any>? = null
+
+    @BeforeEach
+    fun beforeEach() {
+        filterBuilder = PostgrestFilterBuilder(postgrestBuilderMock)
+    }
+
+    @Test
+    fun `not`() {
+        filterBuilder!!.not("columnName", FilterOperator.CD, "val")
+        assertSearchParam("columnName", "not.cd.val")
+    }
+
+    @Test
+    fun `or`() {
+        filterBuilder!!.or("fff")
+        assertSearchParam("or", "(fff)")
+    }
+
+    @Test
+    fun `eq`() {
+        filterBuilder!!.eq("columnName", "val")
+        assertSearchParam("columnName", "eq.val")
+    }
+
+    @Test
+    fun `neq`() {
+        filterBuilder!!.neq("columnName", "val")
+        assertSearchParam("columnName", "neq.val")
+    }
+
+    @Test
+    fun `gt`() {
+        filterBuilder!!.gt("columnName", "val")
+        assertSearchParam("columnName", "gt.val")
+    }
+
+    @Test
+    fun `gte`() {
+        filterBuilder!!.gte("columnName", "val")
+        assertSearchParam("columnName", "gte.val")
+    }
+
+    private fun assertSearchParam(name: String, value: String) {
+        val searchParams = filterBuilder!!.getSearchParams()
+        assertThat(searchParams[name]).isEqualTo(value)
+    }
+}