Boolean isTrue / isFalse

Issue #29

strikt-core/src/main/kotlin/strikt/assertions/Boolean.kt

@@ -0,0 +1,9 @@
+package strikt.assertions
+
+import strikt.api.Assertion
+
+fun Assertion<Boolean>.isTrue() =
+  passesIf("is true") { this }
+
+fun Assertion<Boolean>.isFalse() =
+  passesIf("is false") { !this }

strikt-core/src/test/kotlin/strikt/assertions/BooleanAssertions.kt

@@ -0,0 +1,33 @@
+package strikt.assertions
+
+import org.jetbrains.spek.api.Spek
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.it
+import strikt.api.expect
+import strikt.fails
+
+@Suppress("SimplifyBooleanWithConstants")
+internal object BooleanAssertions : Spek({
+  describe("assertions on ${Boolean::class.simpleName}") {
+    describe("isTrue assertion") {
+      it("passes when the subject is true") {
+        expect("a" == "a").isTrue()
+      }
+      it("fails when the subject is false") {
+        fails {
+          expect("a" == "A").isTrue()
+        }
+      }
+    }
+    describe("isFalse assertion") {
+      it("passes when the subject is false") {
+        expect("a" == "A").isFalse()
+      }
+      it("fails when the subject is false") {
+        fails {
+          expect("a" == "a").isFalse()
+        }
+      }
+    }
+  }
+})