#106 Improve unit tests.

src/test/java/org/cactoos/text/ReplacedTextTest.java

@@ -61,4 +61,17 @@ public void notReplaceTextWhenSubstringNotFound() {
             new TextHasString(text)
         );
     }
+
+    @Test
+    public void replacesAllOccurrences() {
+        MatcherAssert.assertThat(
+            "Can't replace a text with multiple needle occurrences",
+            new ReplacedText(
+                new StringAsText("one cat, two cats, three cats"),
+                "cat",
+                "dog"
+            ),
+            new TextHasString("one dog, two dogs, three dogs")
+        );
+    }
 }

src/test/java/org/cactoos/text/ReversedTextTest.java

@@ -48,4 +48,14 @@ public void reverseText() {
         );
     }
 
+    @Test
+    public void reversedEmptyTextIsEmptyText() {
+        MatcherAssert.assertThat(
+            "Can't reverse empty text",
+            new ReversedText(
+                new StringAsText("")
+            ),
+            new TextHasString("")
+        );
+    }
 }

src/test/java/org/cactoos/text/TextAsBoolTest.java

@@ -55,4 +55,13 @@ public void falseTest() throws IOException {
             Matchers.equalTo(false)
         );
     }
+
+    @Test
+    public void isFalseIfTextDoesNotRepresentABoolean() throws IOException {
+        MatcherAssert.assertThat(
+            "Can't parse a non-boolean string",
+            new TextAsBool("abc").asValue(),
+            Matchers.equalTo(false)
+        );
+    }
 }

src/test/java/org/cactoos/text/TextAsDoubleTest.java

@@ -47,4 +47,9 @@ public strictfp void numberTest() throws IOException {
             Matchers.equalTo(185.65156465123)
         );
     }
+
+    @Test(expected = NumberFormatException.class)
+    public void failsIfTextDoesNotRepresentADouble() throws IOException {
+        new TextAsDouble("abc").asValue();
+    }
 }

src/test/java/org/cactoos/text/TextAsFloatTest.java

@@ -47,4 +47,9 @@ public strictfp void numberTest() throws IOException {
             Matchers.equalTo(1656.894F)
         );
     }
+
+    @Test(expected = NumberFormatException.class)
+    public void failsIfTextDoesNotRepresentAFloat() throws IOException {
+        new TextAsFloat("abc").asValue();
+    }
 }

src/test/java/org/cactoos/text/TextAsIntTest.java

@@ -47,4 +47,9 @@ public void numberTest() throws IOException {
             Matchers.equalTo(1867892354)
         );
     }
+
+    @Test(expected = NumberFormatException.class)
+    public void failsIfTextDoesNotRepresentAnInt() throws IOException {
+        new TextAsDouble("abc").asValue();
+    }
 }

src/test/java/org/cactoos/text/TextAsLongTest.java

@@ -47,4 +47,9 @@ public void numberTest() throws IOException {
             Matchers.equalTo(186789235425346L)
         );
     }
+
+    @Test(expected = NumberFormatException.class)
+    public void failsIfTextDoesNotRepresentALong() throws IOException {
+      new TextAsLong("abc").asValue();
+    }
 }

src/test/java/org/cactoos/text/TrimmedTextTest.java

@@ -45,4 +45,12 @@ public void convertsText() {
         );
     }
 
+    @Test
+    public void trimmedBlankTextIsEmptyText() {
+        MatcherAssert.assertThat(
+            "Can't trim a blank text",
+            new TrimmedText(new StringAsText("  \t ")),
+            new TextHasString("")
+        );
+    }
 }