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diff --git a/src/test/kotlin/net/pterodactylus/sone/template/SubstringFilterTest.kt b/src/test/kotlin/net/pterodactylus/sone/template/SubstringFilterTest.kt
new file mode 100644
index 0000000..eebfe3c
--- /dev/null
+++ b/src/test/kotlin/net/pterodactylus/sone/template/SubstringFilterTest.kt
@@ -0,0 +1,62 @@
+package net.pterodactylus.sone.template
+
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers.equalTo
+import org.junit.Test
+
+/**
+ * Unit test for [SubstringFilter].
+ */
+class SubstringFilterTest {
+
+	private val filter = SubstringFilter()
+	private val string = "abcdefghijklmnopqrstuvwxyz"
+
+	private fun filterText(vararg parameters: Pair<String, Int>) = filter.format(null, string, mapOf(*parameters))
+
+	@Test
+	fun `filter returns the input string when no parameters are given`() {
+		assertThat(filterText(), equalTo<Any>(string))
+	}
+
+	@Test
+	fun `filter returns "abc" if start is omitted and length is three`() {
+	    assertThat(filterText("length" to 3), equalTo<Any>("abc"))
+	}
+
+	@Test
+	fun `filter returns complete string if length is larger than length of string`() {
+	    assertThat(filterText("length" to 3000), equalTo<Any>(string))
+	}
+
+	@Test
+	fun `filter returns part of the string if start is set to index within string`() {
+	    assertThat(filterText("start" to 13), equalTo<Any>("nopqrstuvwxyz"))
+	}
+
+	@Test
+	fun `filter returns last three characters if start is set to minus three`() {
+		assertThat(filterText("start" to -3), equalTo<Any>("xyz"))
+	}
+
+	@Test
+	fun `filter returns center part of string with start and length set`() {
+	    assertThat(filterText("start" to 13, "length" to 3), equalTo<Any>("nop"))
+	}
+
+	@Test
+	fun `filter returns end part of string with start and too-large length set`() {
+	    assertThat(filterText("start" to 23, "length" to 30), equalTo<Any>("xyz"))
+	}
+
+	@Test
+	fun `filter returns end part of string with negative start and too-large length set`() {
+	    assertThat(filterText("start" to -3, "length" to 30), equalTo<Any>("xyz"))
+	}
+
+	@Test
+	fun `filter returns part of end of string with negative start and small length set`() {
+	    assertThat(filterText("start" to -6, "length" to 3), equalTo<Any>("uvw"))
+	}
+
+}