Add unit tests for Result.of

src/test/kotlin/com/github/michaelbull/result/ResultTest.kt

@@ -0,0 +1,25 @@
+package com.github.michaelbull.result
+
+import com.natpryce.hamkrest.Matcher
+import com.natpryce.hamkrest.assertion.assertThat
+import com.natpryce.hamkrest.equalTo
+import com.natpryce.hamkrest.sameInstance
+import org.junit.jupiter.api.Test
+
+internal class ResultTest {
+    @Test
+    internal fun `of should return ok if invocation did not throw anything`() {
+        val callback = { "example" }
+        val value = Result.of(callback).get()
+        assertThat(value, equalTo("example"))
+    }
+
+    @Test
+    internal fun `of should return error if invocation threw something`() {
+        val throwable = IllegalArgumentException("throw me")
+        val callback = { throw throwable }
+        val error = Result.of(callback).getError()!!
+        val matcher: Matcher<Throwable> = sameInstance(throwable)
+        assertThat(error, matcher)
+    }
+}